redis集群增加节点和删除节点、或者reshard时报 migrating 错误

目录

redis安装和创建集群看这里

redis安装

redis集群

Redis集群节点增加

添加节点

节点的 redis.conf  配置 端口 6307

启动新的redis实例

2.添加节点到集群中

添加master节点

添加slave节点

删除slave从节点

删除master节点

如果 reshard 迁移slot 报 migrating 错误

---

redis安装和创建集群看这里

redis安装

redis集群

# 输入命令 redis-trib.rb check 10.10.87.241:6301
# 查看节点数量 ，3个master主 3个slave从

/usr/local/bin/redis-trib.rb check 10.10.87.241:6301

>>> Performing Cluster Check (using node 10.10.87.241:6301)
M: 9f9ceaf702e9c1d95da48bdf98663b6920125a67 10.10.87.241:6301
   slots:0-5460 (5461 slots) master
   1 additional replica(s)
M: cd53abf0512c1ad2efc5860664c3f51863fcec0c 10.10.87.241:6302
   slots:10923-16383 (5461 slots) master
   1 additional replica(s)
S: f13dab343c659994d007eab8a795d18fd01e74a5 10.10.87.242:6304
   slots: (0 slots) slave
   replicates cd1c9f7eee311628cc271c2a8d2614602f773d90
S: cc4cc5c9563dde84554be4eccd93e9f261ce858d 10.10.87.242:6305
   slots: (0 slots) slave
   replicates 9f9ceaf702e9c1d95da48bdf98663b6920125a67
M: cd1c9f7eee311628cc271c2a8d2614602f773d90 10.10.87.241:6303
   slots:5461-10922 (5462 slots) master
   1 additional replica(s)
S: 6e00bd4162e241d5f238f948349021493d4a98df 10.10.87.242:6306
   slots: (0 slots) slave
   replicates cd53abf0512c1ad2efc5860664c3f51863fcec0c
[OK] All nodes agree about slots configuration.
>>> Check for open slots...
>>> Check slots coverage...
[OK] All 16384 slots covered.

 

Redis集群节点增加

添加的节点以主节点 和从节点 两种不同的节点类型加入集群。

若为主节点 ，需要创建一个空节点，然后将某些哈希槽移动到这个空节点中
若为从节点 ，需要创建一个空节点，然后将新节点设置为集群中某个master节点的slave节点
注意： 无论是主节点还是从节点，首先第一步都是创建一个空节点，所以创建步骤都是一致的。

添加节点

节点的 redis.conf  配置 端口 6307

# Redis configuration file example.
#
# Note that in order to read the configuration file, Redis must be
# started with the file path as first argument:
#
# ./redis-server /path/to/redis.conf

# Note on units: when memory size is needed, it is possible to specify
# it in the usual form of 1k 5GB 4M and so forth:
#
# 1k => 1000 bytes
# 1kb => 1024 bytes
# 1m => 1000000 bytes
# 1mb => 1024*1024 bytes
# 1g => 1000000000 bytes
# 1gb => 1024*1024*1024 bytes
#
# units are case insensitive so 1GB 1Gb 1gB are all the same.

################################## INCLUDES ###################################

# Include one or more other config files here.  This is useful if you
# have a standard template that goes to all Redis servers but also need
# to customize a few per-server settings.  Include files can include
# other files, so use this wisely.
#
# Notice option "include" won't be rewritten by command "CONFIG REWRITE"
# from admin or Redis Sentinel. Since Redis always uses the last processed
# line as value of a configuration directive, you'd better put includes
# at the beginning of this file to avoid overwriting config change at runtime.
#
# If instead you are interested in using includes to override configuration
# options, it is better to use include as the last line.
#
# include /path/to/local.conf
# include /path/to/other.conf

################################## NETWORK #####################################

# By default, if no "bind" configuration directive is specified, Redis listens
# for connections from all the network interfaces available on the server.
# It is possible to listen to just one or multiple selected interfaces using
# the "bind" configuration directive, followed by one or more IP addresses.
#
# Examples:
#
# bind 192.168.1.100 10.0.0.1
# bind 127.0.0.1 ::1
#
# ~~~ WARNING ~~~ If the computer running Redis is directly exposed to the
# internet, binding to all the interfaces is dangerous and will expose the
# instance to everybody on the internet. So by default we uncomment the
# following bind directive, that will force Redis to listen only into
# the IPv4 lookback interface address (this means Redis will be able to
# accept connections only from clients running into the same computer it
# is running).
#
# IF YOU ARE SURE YOU WANT YOUR INSTANCE TO LISTEN TO ALL THE INTERFACES
# JUST COMMENT THE FOLLOWING LINE.
# ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
bind 10.10.87.242

# Protected mode is a layer of security protection, in order to avoid that
# Redis instances left open on the internet are accessed and exploited.
#
# When protected mode is on and if:
#
# 1) The server is not binding explicitly to a set of addresses using the
#    "bind" directive.
# 2) No password is configured.
#
# The server only accepts connections from clients connecting from the
# IPv4 and IPv6 loopback addresses 127.0.0.1 and ::1, and from Unix domain
# sockets.
#
# By default protected mode is enabled. You should disable it only if
# you are sure you want clients from other hosts to connect to Redis
# even if no authentication is configured, nor a specific set of interfaces
# are explicitly listed using the "bind" directive.
protected-mode yes

# Accept connections on the specified port, default is 6379 (IANA #815344).
# If port 0 is specified Redis will not listen on a TCP socket.
port 6307

# TCP listen() backlog.
#
# In high requests-per-second environments you need an high backlog in order
# to avoid slow clients connections issues. Note that the Linux kernel
# will silently truncate it to the value of /proc/sys/net/core/somaxconn so
# make sure to raise both the value of somaxconn and tcp_max_syn_backlog
# in order to get the desired effect.
tcp-backlog 511

# Unix socket.
#
# Specify the path for the Unix socket that will be used to listen for
# incoming connections. There is no default, so Redis will not listen
# on a unix socket when not specified.
#
# unixsocket /tmp/redis.sock
# unixsocketperm 700

# Close the connection after a client is idle for N seconds (0 to disable)
timeout 0

# TCP keepalive.
#
# If non-zero, use SO_KEEPALIVE to send TCP ACKs to clients in absence
# of communication. This is useful for two reasons:
#
# 1) Detect dead peers.
# 2) Take the connection alive from the point of view of network
#    equipment in the middle.
#
# On Linux, the specified value (in seconds) is the period used to send ACKs.
# Note that to close the connection the double of the time is needed.
# On other kernels the period depends on the kernel configuration.
#
# A reasonable value for this option is 300 seconds, which is the new
# Redis default starting with Redis 3.2.1.
tcp-keepalive 300

################################# GENERAL #####################################

# By default Redis does not run as a daemon. Use 'yes' if you need it.
# Note that Redis will write a pid file in /var/run/redis.pid when daemonized.
daemonize yes

# If you run Redis from upstart or systemd, Redis can interact with your
# supervision tree. Options:
#   supervised no      - no supervision interaction
#   supervised upstart - signal upstart by putting Redis into SIGSTOP mode
#   supervised systemd - signal systemd by writing READY=1 to $NOTIFY_SOCKET
#   supervised auto    - detect upstart or systemd method based on
#                        UPSTART_JOB or NOTIFY_SOCKET environment variables
# Note: these supervision methods only signal "process is ready."
#       They do not enable continuous liveness pings back to your supervisor.
supervised no

# If a pid file is specified, Redis writes it where specified at startup
# and removes it at exit.
#
# When the server runs non daemonized, no pid file is created if none is
# specified in the configuration. When the server is daemonized, the pid file
# is used even if not specified, defaulting to "/var/run/redis.pid".
#
# Creating a pid file is best effort: if Redis is not able to create it
# nothing bad happens, the server will start and run normally.
pidfile /var/run/redis_6307.pid

# Specify the server verbosity level.
# This can be one of:
# debug (a lot of information, useful for development/testing)
# verbose (many rarely useful info, but not a mess like the debug level)
# notice (moderately verbose, what you want in production probably)
# warning (only very important / critical messages are logged)
loglevel notice

# Specify the log file name. Also the empty string can be used to force
# Redis to log on the standard output. Note that if you use standard
# output for logging but daemonize, logs will be sent to /dev/null
logfile ""

# To enable logging to the system logger, just set 'syslog-enabled' to yes,
# and optionally update the other syslog parameters to suit your needs.
# syslog-enabled no

# Specify the syslog identity.
# syslog-ident redis

# Specify the syslog facility. Must be USER or between LOCAL0-LOCAL7.
# syslog-facility local0

# Set the number of databases. The default database is DB 0, you can select
# a different one on a per-connection basis using SELECT  where
# dbid is a number between 0 and 'databases'-1
databases 16

################################ SNAPSHOTTING  ################################
#
# Save the DB on disk:
#
#   save  
#
#   Will save the DB if both the given number of seconds and the given
#   number of write operations against the DB occurred.
#
#   In the example below the behaviour will be to save:
#   after 900 sec (15 min) if at least 1 key changed
#   after 300 sec (5 min) if at least 10 keys changed
#   after 60 sec if at least 10000 keys changed
#
#   Note: you can disable saving completely by commenting out all "save" lines.
#
#   It is also possible to remove all the previously configured save
#   points by adding a save directive with a single empty string argument
#   like in the following example:
#
#   save ""

save 900 1
save 300 10
save 60 10000

# By default Redis will stop accepting writes if RDB snapshots are enabled
# (at least one save point) and the latest background save failed.
# This will make the user aware (in a hard way) that data is not persisting
# on disk properly, otherwise chances are that no one will notice and some
# disaster will happen.
#
# If the background saving process will start working again Redis will
# automatically allow writes again.
#
# However if you have setup your proper monitoring of the Redis server
# and persistence, you may want to disable this feature so that Redis will
# continue to work as usual even if there are problems with disk,
# permissions, and so forth.
stop-writes-on-bgsave-error yes

# Compress string objects using LZF when dump .rdb databases?
# For default that's set to 'yes' as it's almost always a win.
# If you want to save some CPU in the saving child set it to 'no' but
# the dataset will likely be bigger if you have compressible values or keys.
rdbcompression yes

# Since version 5 of RDB a CRC64 checksum is placed at the end of the file.
# This makes the format more resistant to corruption but there is a performance
# hit to pay (around 10%) when saving and loading RDB files, so you can disable it
# for maximum performances.
#
# RDB files created with checksum disabled have a checksum of zero that will
# tell the loading code to skip the check.
rdbchecksum yes

# The filename where to dump the DB
dbfilename dump.rdb

# The working directory.
#
# The DB will be written inside this directory, with the filename specified
# above using the 'dbfilename' configuration directive.
#
# The Append Only File will also be created inside this directory.
#
# Note that you must specify a directory here, not a file name.
dir /usr/local/redis/redis-cluster/6307/

################################# REPLICATION #################################

# Master-Slave replication. Use slaveof to make a Redis instance a copy of
# another Redis server. A few things to understand ASAP about Redis replication.
#
# 1) Redis replication is asynchronous, but you can configure a master to
#    stop accepting writes if it appears to be not connected with at least
#    a given number of slaves.
# 2) Redis slaves are able to perform a partial resynchronization with the
#    master if the replication link is lost for a relatively small amount of
#    time. You may want to configure the replication backlog size (see the next
#    sections of this file) with a sensible value depending on your needs.
# 3) Replication is automatic and does not need user intervention. After a
#    network partition slaves automatically try to reconnect to masters
#    and resynchronize with them.
#
# slaveof  

# If the master is password protected (using the "requirepass" configuration
# directive below) it is possible to tell the slave to authenticate before
# starting the replication synchronization process, otherwise the master will
# refuse the slave request.
#
# masterauth 

# When a slave loses its connection with the master, or when the replication
# is still in progress, the slave can act in two different ways:
#
# 1) if slave-serve-stale-data is set to 'yes' (the default) the slave will
#    still reply to client requests, possibly with out of date data, or the
#    data set may just be empty if this is the first synchronization.
#
# 2) if slave-serve-stale-data is set to 'no' the slave will reply with
#    an error "SYNC with master in progress" to all the kind of commands
#    but to INFO and SLAVEOF.
#
slave-serve-stale-data yes

# You can configure a slave instance to accept writes or not. Writing against
# a slave instance may be useful to store some ephemeral data (because data
# written on a slave will be easily deleted after resync with the master) but
# may also cause problems if clients are writing to it because of a
# misconfiguration.
#
# Since Redis 2.6 by default slaves are read-only.
#
# Note: read only slaves are not designed to be exposed to untrusted clients
# on the internet. It's just a protection layer against misuse of the instance.
# Still a read only slave exports by default all the administrative commands
# such as CONFIG, DEBUG, and so forth. To a limited extent you can improve
# security of read only slaves using 'rename-command' to shadow all the
# administrative / dangerous commands.
slave-read-only yes

# Replication SYNC strategy: disk or socket.
#
# -------------------------------------------------------
# WARNING: DISKLESS REPLICATION IS EXPERIMENTAL CURRENTLY
# -------------------------------------------------------
#
# New slaves and reconnecting slaves that are not able to continue the replication
# process just receiving differences, need to do what is called a "full
# synchronization". An RDB file is transmitted from the master to the slaves.
# The transmission can happen in two different ways:
#
# 1) Disk-backed: The Redis master creates a new process that writes the RDB
#                 file on disk. Later the file is transferred by the parent
#                 process to the slaves incrementally.
# 2) Diskless: The Redis master creates a new process that directly writes the
#              RDB file to slave sockets, without touching the disk at all.
#
# With disk-backed replication, while the RDB file is generated, more slaves
# can be queued and served with the RDB file as soon as the current child producing
# the RDB file finishes its work. With diskless replication instead once
# the transfer starts, new slaves arriving will be queued and a new transfer
# will start when the current one terminates.
#
# When diskless replication is used, the master waits a configurable amount of
# time (in seconds) before starting the transfer in the hope that multiple slaves
# will arrive and the transfer can be parallelized.
#
# With slow disks and fast (large bandwidth) networks, diskless replication
# works better.
repl-diskless-sync no

# When diskless replication is enabled, it is possible to configure the delay
# the server waits in order to spawn the child that transfers the RDB via socket
# to the slaves.
#
# This is important since once the transfer starts, it is not possible to serve
# new slaves arriving, that will be queued for the next RDB transfer, so the server
# waits a delay in order to let more slaves arrive.
#
# The delay is specified in seconds, and by default is 5 seconds. To disable
# it entirely just set it to 0 seconds and the transfer will start ASAP.
repl-diskless-sync-delay 5

# Slaves send PINGs to server in a predefined interval. It's possible to change
# this interval with the repl_ping_slave_period option. The default value is 10
# seconds.
#
# repl-ping-slave-period 10

# The following option sets the replication timeout for:
#
# 1) Bulk transfer I/O during SYNC, from the point of view of slave.
# 2) Master timeout from the point of view of slaves (data, pings).
# 3) Slave timeout from the point of view of masters (REPLCONF ACK pings).
#
# It is important to make sure that this value is greater than the value
# specified for repl-ping-slave-period otherwise a timeout will be detected
# every time there is low traffic between the master and the slave.
#
# repl-timeout 60

# Disable TCP_NODELAY on the slave socket after SYNC?
#
# If you select "yes" Redis will use a smaller number of TCP packets and
# less bandwidth to send data to slaves. But this can add a delay for
# the data to appear on the slave side, up to 40 milliseconds with
# Linux kernels using a default configuration.
#
# If you select "no" the delay for data to appear on the slave side will
# be reduced but more bandwidth will be used for replication.
#
# By default we optimize for low latency, but in very high traffic conditions
# or when the master and slaves are many hops away, turning this to "yes" may
# be a good idea.
repl-disable-tcp-nodelay no

# Set the replication backlog size. The backlog is a buffer that accumulates
# slave data when slaves are disconnected for some time, so that when a slave
# wants to reconnect again, often a full resync is not needed, but a partial
# resync is enough, just passing the portion of data the slave missed while
# disconnected.
#
# The bigger the replication backlog, the longer the time the slave can be
# disconnected and later be able to perform a partial resynchronization.
#
# The backlog is only allocated once there is at least a slave connected.
#
# repl-backlog-size 1mb

# After a master has no longer connected slaves for some time, the backlog
# will be freed. The following option configures the amount of seconds that
# need to elapse, starting from the time the last slave disconnected, for
# the backlog buffer to be freed.
#
# A value of 0 means to never release the backlog.
#
# repl-backlog-ttl 3600

# The slave priority is an integer number published by Redis in the INFO output.
# It is used by Redis Sentinel in order to select a slave to promote into a
# master if the master is no longer working correctly.
#
# A slave with a low priority number is considered better for promotion, so
# for instance if there are three slaves with priority 10, 100, 25 Sentinel will
# pick the one with priority 10, that is the lowest.
#
# However a special priority of 0 marks the slave as not able to perform the
# role of master, so a slave with priority of 0 will never be selected by
# Redis Sentinel for promotion.
#
# By default the priority is 100.
slave-priority 100

# It is possible for a master to stop accepting writes if there are less than
# N slaves connected, having a lag less or equal than M seconds.
#
# The N slaves need to be in "online" state.
#
# The lag in seconds, that must be <= the specified value, is calculated from
# the last ping received from the slave, that is usually sent every second.
#
# This option does not GUARANTEE that N replicas will accept the write, but
# will limit the window of exposure for lost writes in case not enough slaves
# are available, to the specified number of seconds.
#
# For example to require at least 3 slaves with a lag <= 10 seconds use:
#
# min-slaves-to-write 3
# min-slaves-max-lag 10
#
# Setting one or the other to 0 disables the feature.
#
# By default min-slaves-to-write is set to 0 (feature disabled) and
# min-slaves-max-lag is set to 10.

# A Redis master is able to list the address and port of the attached
# slaves in different ways. For example the "INFO replication" section
# offers this information, which is used, among other tools, by
# Redis Sentinel in order to discover slave instances.
# Another place where this info is available is in the output of the
# "ROLE" command of a masteer.
#
# The listed IP and address normally reported by a slave is obtained
# in the following way:
#
#   IP: The address is auto detected by checking the peer address
#   of the socket used by the slave to connect with the master.
#
#   Port: The port is communicated by the slave during the replication
#   handshake, and is normally the port that the slave is using to
#   list for connections.
#
# However when port forwarding or Network Address Translation (NAT) is
# used, the slave may be actually reachable via different IP and port
# pairs. The following two options can be used by a slave in order to
# report to its master a specific set of IP and port, so that both INFO
# and ROLE will report those values.
#
# There is no need to use both the options if you need to override just
# the port or the IP address.
#
# slave-announce-ip 5.5.5.5
# slave-announce-port 1234

################################## SECURITY ###################################

# Require clients to issue AUTH  before processing any other
# commands.  This might be useful in environments in which you do not trust
# others with access to the host running redis-server.
#
# This should stay commented out for backward compatibility and because most
# people do not need auth (e.g. they run their own servers).
#
# Warning: since Redis is pretty fast an outside user can try up to
# 150k passwords per second against a good box. This means that you should
# use a very strong password otherwise it will be very easy to break.
#
# requirepass foobared

# Command renaming.
#
# It is possible to change the name of dangerous commands in a shared
# environment. For instance the CONFIG command may be renamed into something
# hard to guess so that it will still be available for internal-use tools
# but not available for general clients.
#
# Example:
#
# rename-command CONFIG b840fc02d524045429941cc15f59e41cb7be6c52
#
# It is also possible to completely kill a command by renaming it into
# an empty string:
#
# rename-command CONFIG ""
#
# Please note that changing the name of commands that are logged into the
# AOF file or transmitted to slaves may cause problems.

################################### LIMITS ####################################

# Set the max number of connected clients at the same time. By default
# this limit is set to 10000 clients, however if the Redis server is not
# able to configure the process file limit to allow for the specified limit
# the max number of allowed clients is set to the current file limit
# minus 32 (as Redis reserves a few file descriptors for internal uses).
#
# Once the limit is reached Redis will close all the new connections sending
# an error 'max number of clients reached'.
#
# maxclients 10000

# Don't use more memory than the specified amount of bytes.
# When the memory limit is reached Redis will try to remove keys
# according to the eviction policy selected (see maxmemory-policy).
#
# If Redis can't remove keys according to the policy, or if the policy is
# set to 'noeviction', Redis will start to reply with errors to commands
# that would use more memory, like SET, LPUSH, and so on, and will continue
# to reply to read-only commands like GET.
#
# This option is usually useful when using Redis as an LRU cache, or to set
# a hard memory limit for an instance (using the 'noeviction' policy).
#
# WARNING: If you have slaves attached to an instance with maxmemory on,
# the size of the output buffers needed to feed the slaves are subtracted
# from the used memory count, so that network problems / resyncs will
# not trigger a loop where keys are evicted, and in turn the output
# buffer of slaves is full with DELs of keys evicted triggering the deletion
# of more keys, and so forth until the database is completely emptied.
#
# In short... if you have slaves attached it is suggested that you set a lower
# limit for maxmemory so that there is some free RAM on the system for slave
# output buffers (but this is not needed if the policy is 'noeviction').
#
# maxmemory 

# MAXMEMORY POLICY: how Redis will select what to remove when maxmemory
# is reached. You can select among five behaviors:
#
# volatile-lru -> remove the key with an expire set using an LRU algorithm
# allkeys-lru -> remove any key according to the LRU algorithm
# volatile-random -> remove a random key with an expire set
# allkeys-random -> remove a random key, any key
# volatile-ttl -> remove the key with the nearest expire time (minor TTL)
# noeviction -> don't expire at all, just return an error on write operations
#
# Note: with any of the above policies, Redis will return an error on write
#       operations, when there are no suitable keys for eviction.
#
#       At the date of writing these commands are: set setnx setex append
#       incr decr rpush lpush rpushx lpushx linsert lset rpoplpush sadd
#       sinter sinterstore sunion sunionstore sdiff sdiffstore zadd zincrby
#       zunionstore zinterstore hset hsetnx hmset hincrby incrby decrby
#       getset mset msetnx exec sort
#
# The default is:
#
# maxmemory-policy noeviction

# LRU and minimal TTL algorithms are not precise algorithms but approximated
# algorithms (in order to save memory), so you can tune it for speed or
# accuracy. For default Redis will check five keys and pick the one that was
# used less recently, you can change the sample size using the following
# configuration directive.
#
# The default of 5 produces good enough results. 10 Approximates very closely
# true LRU but costs a bit more CPU. 3 is very fast but not very accurate.
#
# maxmemory-samples 5

############################## APPEND ONLY MODE ###############################

# By default Redis asynchronously dumps the dataset on disk. This mode is
# good enough in many applications, but an issue with the Redis process or
# a power outage may result into a few minutes of writes lost (depending on
# the configured save points).
#
# The Append Only File is an alternative persistence mode that provides
# much better durability. For instance using the default data fsync policy
# (see later in the config file) Redis can lose just one second of writes in a
# dramatic event like a server power outage, or a single write if something
# wrong with the Redis process itself happens, but the operating system is
# still running correctly.
#
# AOF and RDB persistence can be enabled at the same time without problems.
# If the AOF is enabled on startup Redis will load the AOF, that is the file
# with the better durability guarantees.
#
# Please check http://redis.io/topics/persistence for more information.

appendonly yes

# The name of the append only file (default: "appendonly.aof")

appendfilename "appendonly.aof"

# The fsync() call tells the Operating System to actually write data on disk
# instead of waiting for more data in the output buffer. Some OS will really flush
# data on disk, some other OS will just try to do it ASAP.
#
# Redis supports three different modes:
#
# no: don't fsync, just let the OS flush the data when it wants. Faster.
# always: fsync after every write to the append only log. Slow, Safest.
# everysec: fsync only one time every second. Compromise.
#
# The default is "everysec", as that's usually the right compromise between
# speed and data safety. It's up to you to understand if you can relax this to
# "no" that will let the operating system flush the output buffer when
# it wants, for better performances (but if you can live with the idea of
# some data loss consider the default persistence mode that's snapshotting),
# or on the contrary, use "always" that's very slow but a bit safer than
# everysec.
#
# More details please check the following article:
# http://antirez.com/post/redis-persistence-demystified.html
#
# If unsure, use "everysec".

# appendfsync always
appendfsync everysec
# appendfsync no

# When the AOF fsync policy is set to always or everysec, and a background
# saving process (a background save or AOF log background rewriting) is
# performing a lot of I/O against the disk, in some Linux configurations
# Redis may block too long on the fsync() call. Note that there is no fix for
# this currently, as even performing fsync in a different thread will block
# our synchronous write(2) call.
#
# In order to mitigate this problem it's possible to use the following option
# that will prevent fsync() from being called in the main process while a
# BGSAVE or BGREWRITEAOF is in progress.
#
# This means that while another child is saving, the durability of Redis is
# the same as "appendfsync none". In practical terms, this means that it is
# possible to lose up to 30 seconds of log in the worst scenario (with the
# default Linux settings).
#
# If you have latency problems turn this to "yes". Otherwise leave it as
# "no" that is the safest pick from the point of view of durability.

no-appendfsync-on-rewrite no

# Automatic rewrite of the append only file.
# Redis is able to automatically rewrite the log file implicitly calling
# BGREWRITEAOF when the AOF log size grows by the specified percentage.
#
# This is how it works: Redis remembers the size of the AOF file after the
# latest rewrite (if no rewrite has happened since the restart, the size of
# the AOF at startup is used).
#
# This base size is compared to the current size. If the current size is
# bigger than the specified percentage, the rewrite is triggered. Also
# you need to specify a minimal size for the AOF file to be rewritten, this
# is useful to avoid rewriting the AOF file even if the percentage increase
# is reached but it is still pretty small.
#
# Specify a percentage of zero in order to disable the automatic AOF
# rewrite feature.

auto-aof-rewrite-percentage 100
auto-aof-rewrite-min-size 64mb

# An AOF file may be found to be truncated at the end during the Redis
# startup process, when the AOF data gets loaded back into memory.
# This may happen when the system where Redis is running
# crashes, especially when an ext4 filesystem is mounted without the
# data=ordered option (however this can't happen when Redis itself
# crashes or aborts but the operating system still works correctly).
#
# Redis can either exit with an error when this happens, or load as much
# data as possible (the default now) and start if the AOF file is found
# to be truncated at the end. The following option controls this behavior.
#
# If aof-load-truncated is set to yes, a truncated AOF file is loaded and
# the Redis server starts emitting a log to inform the user of the event.
# Otherwise if the option is set to no, the server aborts with an error
# and refuses to start. When the option is set to no, the user requires
# to fix the AOF file using the "redis-check-aof" utility before to restart
# the server.
#
# Note that if the AOF file will be found to be corrupted in the middle
# the server will still exit with an error. This option only applies when
# Redis will try to read more data from the AOF file but not enough bytes
# will be found.
aof-load-truncated yes

################################ LUA SCRIPTING  ###############################

# Max execution time of a Lua script in milliseconds.
#
# If the maximum execution time is reached Redis will log that a script is
# still in execution after the maximum allowed time and will start to
# reply to queries with an error.
#
# When a long running script exceeds the maximum execution time only the
# SCRIPT KILL and SHUTDOWN NOSAVE commands are available. The first can be
# used to stop a script that did not yet called write commands. The second
# is the only way to shut down the server in the case a write command was
# already issued by the script but the user doesn't want to wait for the natural
# termination of the script.
#
# Set it to 0 or a negative value for unlimited execution without warnings.
lua-time-limit 5000

################################ REDIS CLUSTER  ###############################
#
# ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
# WARNING EXPERIMENTAL: Redis Cluster is considered to be stable code, however
# in order to mark it as "mature" we need to wait for a non trivial percentage
# of users to deploy it in production.
# ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
#
# Normal Redis instances can't be part of a Redis Cluster; only nodes that are
# started as cluster nodes can. In order to start a Redis instance as a
# cluster node enable the cluster support uncommenting the following:
#
cluster-enabled yes


# Every cluster node has a cluster configuration file. This file is not
# intended to be edited by hand. It is created and updated by Redis nodes.
# Every Redis Cluster node requires a different cluster configuration file.
# Make sure that instances running in the same system do not have
# overlapping cluster configuration file names.
#
cluster-config-file nodes.conf

# Cluster node timeout is the amount of milliseconds a node must be unreachable
# for it to be considered in failure state.
# Most other internal time limits are multiple of the node timeout.
#
cluster-node-timeout 5000

# A slave of a failing master will avoid to start a failover if its data
# looks too old.
#
# There is no simple way for a slave to actually have a exact measure of
# its "data age", so the following two checks are performed:
#
# 1) If there are multiple slaves able to failover, they exchange messages
#    in order to try to give an advantage to the slave with the best
#    replication offset (more data from the master processed).
#    Slaves will try to get their rank by offset, and apply to the start
#    of the failover a delay proportional to their rank.
#
# 2) Every single slave computes the time of the last interaction with
#    its master. This can be the last ping or command received (if the master
#    is still in the "connected" state), or the time that elapsed since the
#    disconnection with the master (if the replication link is currently down).
#    If the last interaction is too old, the slave will not try to failover
#    at all.
#
# The point "2" can be tuned by user. Specifically a slave will not perform
# the failover if, since the last interaction with the master, the time
# elapsed is greater than:
#
#   (node-timeout * slave-validity-factor) + repl-ping-slave-period
#
# So for example if node-timeout is 30 seconds, and the slave-validity-factor
# is 10, and assuming a default repl-ping-slave-period of 10 seconds, the
# slave will not try to failover if it was not able to talk with the master
# for longer than 310 seconds.
#
# A large slave-validity-factor may allow slaves with too old data to failover
# a master, while a too small value may prevent the cluster from being able to
# elect a slave at all.
#
# For maximum availability, it is possible to set the slave-validity-factor
# to a value of 0, which means, that slaves will always try to failover the
# master regardless of the last time they interacted with the master.
# (However they'll always try to apply a delay proportional to their
# offset rank).
#
# Zero is the only value able to guarantee that when all the partitions heal
# the cluster will always be able to continue.
#
# cluster-slave-validity-factor 10

# Cluster slaves are able to migrate to orphaned masters, that are masters
# that are left without working slaves. This improves the cluster ability
# to resist to failures as otherwise an orphaned master can't be failed over
# in case of failure if it has no working slaves.
#
# Slaves migrate to orphaned masters only if there are still at least a
# given number of other working slaves for their old master. This number
# is the "migration barrier". A migration barrier of 1 means that a slave
# will migrate only if there is at least 1 other working slave for its master
# and so forth. It usually reflects the number of slaves you want for every
# master in your cluster.
#
# Default is 1 (slaves migrate only if their masters remain with at least
# one slave). To disable migration just set it to a very large value.
# A value of 0 can be set but is useful only for debugging and dangerous
# in production.
#
# cluster-migration-barrier 1

# By default Redis Cluster nodes stop accepting queries if they detect there
# is at least an hash slot uncovered (no available node is serving it).
# This way if the cluster is partially down (for example a range of hash slots
# are no longer covered) all the cluster becomes, eventually, unavailable.
# It automatically returns available as soon as all the slots are covered again.
#
# However sometimes you want the subset of the cluster which is working,
# to continue to accept queries for the part of the key space that is still
# covered. In order to do so, just set the cluster-require-full-coverage
# option to no.
#
# cluster-require-full-coverage yes

# In order to setup your cluster make sure to read the documentation
# available at http://redis.io web site.

################################## SLOW LOG ###################################

# The Redis Slow Log is a system to log queries that exceeded a specified
# execution time. The execution time does not include the I/O operations
# like talking with the client, sending the reply and so forth,
# but just the time needed to actually execute the command (this is the only
# stage of command execution where the thread is blocked and can not serve
# other requests in the meantime).
#
# You can configure the slow log with two parameters: one tells Redis
# what is the execution time, in microseconds, to exceed in order for the
# command to get logged, and the other parameter is the length of the
# slow log. When a new command is logged the oldest one is removed from the
# queue of logged commands.

# The following time is expressed in microseconds, so 1000000 is equivalent
# to one second. Note that a negative number disables the slow log, while
# a value of zero forces the logging of every command.
slowlog-log-slower-than 10000

# There is no limit to this length. Just be aware that it will consume memory.
# You can reclaim memory used by the slow log with SLOWLOG RESET.
slowlog-max-len 128

################################ LATENCY MONITOR ##############################

# The Redis latency monitoring subsystem samples different operations
# at runtime in order to collect data related to possible sources of
# latency of a Redis instance.
#
# Via the LATENCY command this information is available to the user that can
# print graphs and obtain reports.
#
# The system only logs operations that were performed in a time equal or
# greater than the amount of milliseconds specified via the
# latency-monitor-threshold configuration directive. When its value is set
# to zero, the latency monitor is turned off.
#
# By default latency monitoring is disabled since it is mostly not needed
# if you don't have latency issues, and collecting data has a performance
# impact, that while very small, can be measured under big load. Latency
# monitoring can easily be enabled at runtime using the command
# "CONFIG SET latency-monitor-threshold " if needed.
latency-monitor-threshold 0

############################# EVENT NOTIFICATION ##############################

# Redis can notify Pub/Sub clients about events happening in the key space.
# This feature is documented at http://redis.io/topics/notifications
#
# For instance if keyspace events notification is enabled, and a client
# performs a DEL operation on key "foo" stored in the Database 0, two
# messages will be published via Pub/Sub:
#
# PUBLISH __keyspace@0__:foo del
# PUBLISH __keyevent@0__:del foo
#
# It is possible to select the events that Redis will notify among a set
# of classes. Every class is identified by a single character:
#
#  K     Keyspace events, published with __keyspace@__ prefix.
#  E     Keyevent events, published with __keyevent@__ prefix.
#  g     Generic commands (non-type specific) like DEL, EXPIRE, RENAME, ...
#  $     String commands
#  l     List commands
#  s     Set commands
#  h     Hash commands
#  z     Sorted set commands
#  x     Expired events (events generated every time a key expires)
#  e     Evicted events (events generated when a key is evicted for maxmemory)
#  A     Alias for g$lshzxe, so that the "AKE" string means all the events.
#
#  The "notify-keyspace-events" takes as argument a string that is composed
#  of zero or multiple characters. The empty string means that notifications
#  are disabled.
#
#  Example: to enable list and generic events, from the point of view of the
#           event name, use:
#
#  notify-keyspace-events Elg
#
#  Example 2: to get the stream of the expired keys subscribing to channel
#             name __keyevent@0__:expired use:
#
#  notify-keyspace-events Ex
#
#  By default all notifications are disabled because most users don't need
#  this feature and the feature has some overhead. Note that if you don't
#  specify at least one of K or E, no events will be delivered.
notify-keyspace-events ""

############################### ADVANCED CONFIG ###############################

# Hashes are encoded using a memory efficient data structure when they have a
# small number of entries, and the biggest entry does not exceed a given
# threshold. These thresholds can be configured using the following directives.
hash-max-ziplist-entries 512
hash-max-ziplist-value 64

# Lists are also encoded in a special way to save a lot of space.
# The number of entries allowed per internal list node can be specified
# as a fixed maximum size or a maximum number of elements.
# For a fixed maximum size, use -5 through -1, meaning:
# -5: max size: 64 Kb  <-- not recommended for normal workloads
# -4: max size: 32 Kb  <-- not recommended
# -3: max size: 16 Kb  <-- probably not recommended
# -2: max size: 8 Kb   <-- good
# -1: max size: 4 Kb   <-- good
# Positive numbers mean store up to _exactly_ that number of elements
# per list node.
# The highest performing option is usually -2 (8 Kb size) or -1 (4 Kb size),
# but if your use case is unique, adjust the settings as necessary.
list-max-ziplist-size -2

# Lists may also be compressed.
# Compress depth is the number of quicklist ziplist nodes from *each* side of
# the list to *exclude* from compression.  The head and tail of the list
# are always uncompressed for fast push/pop operations.  Settings are:
# 0: disable all list compression
# 1: depth 1 means "don't start compressing until after 1 node into the list,
#    going from either the head or tail"
#    So: [head]->node->node->...->node->[tail]
#    [head], [tail] will always be uncompressed; inner nodes will compress.
# 2: [head]->[next]->node->node->...->node->[prev]->[tail]
#    2 here means: don't compress head or head->next or tail->prev or tail,
#    but compress all nodes between them.
# 3: [head]->[next]->[next]->node->node->...->node->[prev]->[prev]->[tail]
# etc.
list-compress-depth 0

# Sets have a special encoding in just one case: when a set is composed
# of just strings that happen to be integers in radix 10 in the range
# of 64 bit signed integers.
# The following configuration setting sets the limit in the size of the
# set in order to use this special memory saving encoding.
set-max-intset-entries 512

# Similarly to hashes and lists, sorted sets are also specially encoded in
# order to save a lot of space. This encoding is only used when the length and
# elements of a sorted set are below the following limits:
zset-max-ziplist-entries 128
zset-max-ziplist-value 64

# HyperLogLog sparse representation bytes limit. The limit includes the
# 16 bytes header. When an HyperLogLog using the sparse representation crosses
# this limit, it is converted into the dense representation.
#
# A value greater than 16000 is totally useless, since at that point the
# dense representation is more memory efficient.
#
# The suggested value is ~ 3000 in order to have the benefits of
# the space efficient encoding without slowing down too much PFADD,
# which is O(N) with the sparse encoding. The value can be raised to
# ~ 10000 when CPU is not a concern, but space is, and the data set is
# composed of many HyperLogLogs with cardinality in the 0 - 15000 range.
hll-sparse-max-bytes 3000

# Active rehashing uses 1 millisecond every 100 milliseconds of CPU time in
# order to help rehashing the main Redis hash table (the one mapping top-level
# keys to values). The hash table implementation Redis uses (see dict.c)
# performs a lazy rehashing: the more operation you run into a hash table
# that is rehashing, the more rehashing "steps" are performed, so if the
# server is idle the rehashing is never complete and some more memory is used
# by the hash table.
#
# The default is to use this millisecond 10 times every second in order to
# actively rehash the main dictionaries, freeing memory when possible.
#
# If unsure:
# use "activerehashing no" if you have hard latency requirements and it is
# not a good thing in your environment that Redis can reply from time to time
# to queries with 2 milliseconds delay.
#
# use "activerehashing yes" if you don't have such hard requirements but
# want to free memory asap when possible.
activerehashing yes

# The client output buffer limits can be used to force disconnection of clients
# that are not reading data from the server fast enough for some reason (a
# common reason is that a Pub/Sub client can't consume messages as fast as the
# publisher can produce them).
#
# The limit can be set differently for the three different classes of clients:
#
# normal -> normal clients including MONITOR clients
# slave  -> slave clients
# pubsub -> clients subscribed to at least one pubsub channel or pattern
#
# The syntax of every client-output-buffer-limit directive is the following:
#
# client-output-buffer-limit    
#
# A client is immediately disconnected once the hard limit is reached, or if
# the soft limit is reached and remains reached for the specified number of
# seconds (continuously).
# So for instance if the hard limit is 32 megabytes and the soft limit is
# 16 megabytes / 10 seconds, the client will get disconnected immediately
# if the size of the output buffers reach 32 megabytes, but will also get
# disconnected if the client reaches 16 megabytes and continuously overcomes
# the limit for 10 seconds.
#
# By default normal clients are not limited because they don't receive data
# without asking (in a push way), but just after a request, so only
# asynchronous clients may create a scenario where data is requested faster
# than it can read.
#
# Instead there is a default limit for pubsub and slave clients, since
# subscribers and slaves receive data in a push fashion.
#
# Both the hard or the soft limit can be disabled by setting them to zero.
client-output-buffer-limit normal 0 0 0
client-output-buffer-limit slave 256mb 64mb 60
client-output-buffer-limit pubsub 32mb 8mb 60

# Redis calls an internal function to perform many background tasks, like
# closing connections of clients in timeout, purging expired keys that are
# never requested, and so forth.
#
# Not all tasks are performed with the same frequency, but Redis checks for
# tasks to perform according to the specified "hz" value.
#
# By default "hz" is set to 10. Raising the value will use more CPU when
# Redis is idle, but at the same time will make Redis more responsive when
# there are many keys expiring at the same time, and timeouts may be
# handled with more precision.
#
# The range is between 1 and 500, however a value over 100 is usually not
# a good idea. Most users should use the default of 10 and raise this up to
# 100 only in environments where very low latency is required.
hz 10

# When a child rewrites the AOF file, if the following option is enabled
# the file will be fsync-ed every 32 MB of data generated. This is useful
# in order to commit the file to the disk more incrementally and avoid
# big latency spikes.
aof-rewrite-incremental-fsync yes

启动新的redis实例

来到redis的安装目录下的集群目录 redis-cluster ，创建目录6307和配置文件 redis.conf ，创建目录6308和配置文件 redis.conf

[root@localhost redis-cluster]# ls -la
total 52
drwxr-xr-x. 10 root root   120 Nov 23 10:16 .
drwxrwxr-x.  8 root root  4096 Nov 23 08:54 ..
drwxr-xr-x.  2 root root    24 Nov 23 08:54 6301
drwxr-xr-x.  2 root root    24 Nov 23 08:54 6302
drwxr-xr-x.  2 root root    24 Nov 23 08:54 6303
drwxr-xr-x.  2 root root    80 Nov 23 10:01 6304
drwxr-xr-x.  2 root root    80 Nov 23 10:04 6305
drwxr-xr-x.  2 root root    80 Nov 23 10:04 6306
drwxr-xr-x.  2 root root    24 Nov 23 10:16 6307
drwxr-xr-x.  2 root root    24 Nov 23 10:16 6308

[root@localhost redis-cluster]# cd 6307
[root@localhost 6307]# ls -la
total 48
drwxr-xr-x.  2 root root    24 Nov 23 10:16 .
drwxr-xr-x. 10 root root   120 Nov 23 10:16 ..
-rw-r--r--.  1 root root 46723 Nov 23 10:16 redis.conf

 启动 redis 服务

[root@localhost 6307]# /usr/local/redis/src/redis-server /usr/local/redis/redis-cluster/6307/redis.conf

查看10.10.87.241  redis 启动列表

[root@localhost 6301]# ps -aux | grep redis
root      8767  0.1  0.5 135332  2960 ?        Ssl  09:48   0:03 /usr/local/redis/src/redis-server 10.10.87.241:6301 [cluster]
root      8773  0.1  0.5 135048  2800 ?        Ssl  09:48   0:03 /usr/local/redis/src/redis-server 10.10.87.241:6302 [cluster]
root      8779  0.1  0.5 135028  2720 ?        Ssl  09:49   0:03 /usr/local/redis/src/redis-server 10.10.87.241:6303 [cluster]
root     10747  0.0  0.1 112704   948 pts/0    R+   10:29   0:00 grep --color=auto redis

查看10.10.87.242  redis 启动列表

[root@localhost 6307]# ps -aux | grep redis
root      5186  0.1  0.5 134000  2716 ?        Ssl  09:49   0:03 /usr/local/redis/src/redis-server 10.10.87.242:6305 [cluster]
root      5190  0.1  0.5 134000  2712 ?        Ssl  09:49   0:03 /usr/local/redis/src/redis-server 10.10.87.242:6306 [cluster]
root      5218  0.1  0.5 134004  2660 ?        Ssl  10:01   0:02 /usr/local/redis/src/redis-server 10.10.87.242:6304 [cluster]
root      5244  0.0  0.4 133872  2392 ?        Ssl  10:27   0:00 /usr/local/redis/src/redis-server 10.10.87.242:6307 [cluster]
root      5248  0.0  0.1 112704   952 pts/0    R+   10:28   0:00 grep --color=auto redis

 

2.添加节点到集群中

添加master节点

#redis-tirb 的add-node命令解释
#add-node        new_host:new_port existing_host:existing_port

[root@localhost 6307]# /usr/local/bin/redis-trib.rb add-node 10.10.87.242:6307 10.10.87.241:6301
>>> Adding node 10.10.87.242:6307 to cluster 10.10.87.241:6301
>>> Performing Cluster Check (using node 10.10.87.241:6301)
M: 9f9ceaf702e9c1d95da48bdf98663b6920125a67 10.10.87.241:6301
   slots:0-5460 (5461 slots) master
   1 additional replica(s)
M: cd53abf0512c1ad2efc5860664c3f51863fcec0c 10.10.87.241:6302
   slots:10923-16383 (5461 slots) master
   1 additional replica(s)
S: f13dab343c659994d007eab8a795d18fd01e74a5 10.10.87.242:6304
   slots: (0 slots) slave
   replicates cd1c9f7eee311628cc271c2a8d2614602f773d90
S: cc4cc5c9563dde84554be4eccd93e9f261ce858d 10.10.87.242:6305
   slots: (0 slots) slave
   replicates 9f9ceaf702e9c1d95da48bdf98663b6920125a67
M: cd1c9f7eee311628cc271c2a8d2614602f773d90 10.10.87.241:6303
   slots:5461-10922 (5462 slots) master
   1 additional replica(s)
S: 6e00bd4162e241d5f238f948349021493d4a98df 10.10.87.242:6306
   slots: (0 slots) slave
   replicates cd53abf0512c1ad2efc5860664c3f51863fcec0c
[OK] All nodes agree about slots configuration.
>>> Check for open slots...
>>> Check slots coverage...
[OK] All 16384 slots covered.
>>> Send CLUSTER MEET to node 10.10.87.242:6307 to make it join the cluster.
[OK] New node added correctly.

查看 集群的redis 

[root@localhost 6307]# /usr/local/bin/redis-trib.rb check 10.10.87.241:6301
>>> Performing Cluster Check (using node 10.10.87.241:6301)
M: 9f9ceaf702e9c1d95da48bdf98663b6920125a67 10.10.87.241:6301
   slots:0-5460 (5461 slots) master
   1 additional replica(s)
M: a96908e1e53fcf01d148f2af2dbcbb6a35361a9e 10.10.87.242:6307
   slots: (0 slots) master
   0 additional replica(s)
M: cd53abf0512c1ad2efc5860664c3f51863fcec0c 10.10.87.241:6302
   slots:10923-16383 (5461 slots) master
   1 additional replica(s)
S: f13dab343c659994d007eab8a795d18fd01e74a5 10.10.87.242:6304
   slots: (0 slots) slave
   replicates cd1c9f7eee311628cc271c2a8d2614602f773d90
S: cc4cc5c9563dde84554be4eccd93e9f261ce858d 10.10.87.242:6305
   slots: (0 slots) slave
   replicates 9f9ceaf702e9c1d95da48bdf98663b6920125a67
M: cd1c9f7eee311628cc271c2a8d2614602f773d90 10.10.87.241:6303
   slots:5461-10922 (5462 slots) master
   1 additional replica(s)
S: 6e00bd4162e241d5f238f948349021493d4a98df 10.10.87.242:6306
   slots: (0 slots) slave
   replicates cd53abf0512c1ad2efc5860664c3f51863fcec0c
[OK] All nodes agree about slots configuration.
>>> Check for open slots...
>>> Check slots coverage...
[OK] All 16384 slots covered.

 

可以看到 6307 作为master 加入到redis集群中 ，但 6307 没有slots卡槽

使用下面命令移动卡槽到 6307 中

[root@localhost 6307]# /usr/local/bin/redis-trib.rb reshard 10.10.87.242:6307
>>> Performing Cluster Check (using node 10.10.87.242:6307)
M: a96908e1e53fcf01d148f2af2dbcbb6a35361a9e 10.10.87.242:6307
   slots: (0 slots) master
   0 additional replica(s)
M: cd53abf0512c1ad2efc5860664c3f51863fcec0c 10.10.87.241:6302
   slots:10923-16383 (5461 slots) master
   1 additional replica(s)
S: 6e00bd4162e241d5f238f948349021493d4a98df 10.10.87.242:6306
   slots: (0 slots) slave
   replicates cd53abf0512c1ad2efc5860664c3f51863fcec0c
M: 9f9ceaf702e9c1d95da48bdf98663b6920125a67 10.10.87.241:6301
   slots:1499-5460 (5461 slots) master
   1 additional replica(s)
S: cc4cc5c9563dde84554be4eccd93e9f261ce858d 10.10.87.242:6305
   slots: (0 slots) slave
   replicates 9f9ceaf702e9c1d95da48bdf98663b6920125a67
S: f13dab343c659994d007eab8a795d18fd01e74a5 10.10.87.242:6304
   slots: (0 slots) slave
   replicates cd1c9f7eee311628cc271c2a8d2614602f773d90
M: cd1c9f7eee311628cc271c2a8d2614602f773d90 10.10.87.241:6303
   slots:6962-10922 (5462 slots) master
   1 additional replica(s)
[OK] All nodes agree about slots configuration.
>>> Check for open slots...
>>> Check slots coverage...
[OK] All 16384 slots covered.
How many slots do you want to move (from 1 to 16384)? 3000  ###这是移动的卡槽数
What is the receiving node ID? a96908e1e53fcf01d148f2af2dbcbb6a35361a9e ###接收的节点id
Please enter all the source node IDs.
  Type 'all' to use all the nodes as source nodes for the hash slots.
  Type 'done' once you entered all the source nodes IDs.
Source node #1:9f9ceaf702e9c1d95da48bdf98663b6920125a67 ###提取的节点id 也可以填写all
Source node #2:done ###完成分配

最后查看分配的结果

[root@localhost 6307]# /usr/local/bin/redis-trib.rb check 10.10.87.242:6307
>>> Performing Cluster Check (using node 10.10.87.242:6307)
M: a96908e1e53fcf01d148f2af2dbcbb6a35361a9e 10.10.87.242:6307
   slots:0-1498,5461-6961 (3000 slots) master
   0 additional replica(s)
M: cd53abf0512c1ad2efc5860664c3f51863fcec0c 10.10.87.241:6302
   slots:10923-16383 (5461 slots) master
   1 additional replica(s)
S: 6e00bd4162e241d5f238f948349021493d4a98df 10.10.87.242:6306
   slots: (0 slots) slave
   replicates cd53abf0512c1ad2efc5860664c3f51863fcec0c
M: 9f9ceaf702e9c1d95da48bdf98663b6920125a67 10.10.87.241:6301
   slots:1499-5460 (3962 slots) master
   1 additional replica(s)
S: cc4cc5c9563dde84554be4eccd93e9f261ce858d 10.10.87.242:6305
   slots: (0 slots) slave
   replicates 9f9ceaf702e9c1d95da48bdf98663b6920125a67
S: f13dab343c659994d007eab8a795d18fd01e74a5 10.10.87.242:6304
   slots: (0 slots) slave
   replicates cd1c9f7eee311628cc271c2a8d2614602f773d90
M: cd1c9f7eee311628cc271c2a8d2614602f773d90 10.10.87.241:6303
   slots:6962-10922 (3961 slots) master
   1 additional replica(s)
[OK] All nodes agree about slots configuration.
>>> Check for open slots...
>>> Check slots coverage...
[OK] All 16384 slots covered.

添加slave节点

启动 redis 服务

[root@localhost 6308]# /usr/local/redis/src/redis-server /usr/local/redis/redis-cluster/6308/redis.conf
[root@localhost 6308]# ps -aux | grep redis
root      5186  0.1  0.5 134000  2752 ?        Ssl  09:49   0:33 /usr/local/redis/src/redis-server 10.10.87.242:6305 [cluster]
root      5190  0.1  0.5 134000  2712 ?        Ssl  09:49   0:33 /usr/local/redis/src/redis-server 10.10.87.242:6306 [cluster]
root      5218  0.1  0.5 134004  2688 ?        Ssl  10:01   0:32 /usr/local/redis/src/redis-server 10.10.87.242:6304 [cluster]
root      5244  0.1  0.5 134056  2792 ?        Ssl  10:27   0:29 /usr/local/redis/src/redis-server 10.10.87.242:6307 [cluster]
root      5619  0.0  0.4 133872  2388 ?        Ssl  15:15   0:00 /usr/local/redis/src/redis-server 10.10.87.242:6308 [cluster]
root      5623  0.0  0.1 112704   948 pts/0    R+   15:15   0:00 grep --color=auto redis

将 6308 加入到 redis 集群中

 

# 下面命令表示 使用 redis-trib.rb 
# add-node                           添加一个节点 
# --slave                            从节点
# --master-id                        该从节点的master节点id
# 10.10.87.242:6308                  节点的ip和端口
# 10.10.87.241:6301                  加入的redis集群的其中一个节点ip和端口

[root@localhost 6308]# /usr/local/bin/redis-trib.rb add-node --slave --master-id a96908e1e53fcf01d148f2af2dbcbb6a35361a9e 10.10.87.242:6308 10.10.87.241:6301
>>> Adding node 10.10.87.242:6308 to cluster 10.10.87.241:6301
>>> Performing Cluster Check (using node 10.10.87.241:6301)
M: 9f9ceaf702e9c1d95da48bdf98663b6920125a67 10.10.87.241:6301
   slots:1499-5460 (3962 slots) master
   1 additional replica(s)
M: a96908e1e53fcf01d148f2af2dbcbb6a35361a9e 10.10.87.242:6307
   slots:0-1498,5461-6961 (3000 slots) master
   0 additional replica(s)
M: cd53abf0512c1ad2efc5860664c3f51863fcec0c 10.10.87.241:6302
   slots:10923-16383 (5461 slots) master
   1 additional replica(s)
S: f13dab343c659994d007eab8a795d18fd01e74a5 10.10.87.242:6304
   slots: (0 slots) slave
   replicates cd1c9f7eee311628cc271c2a8d2614602f773d90
S: cc4cc5c9563dde84554be4eccd93e9f261ce858d 10.10.87.242:6305
   slots: (0 slots) slave
   replicates 9f9ceaf702e9c1d95da48bdf98663b6920125a67
M: cd1c9f7eee311628cc271c2a8d2614602f773d90 10.10.87.241:6303
   slots:6962-10922 (3961 slots) master
   1 additional replica(s)
S: 6e00bd4162e241d5f238f948349021493d4a98df 10.10.87.242:6306
   slots: (0 slots) slave
   replicates cd53abf0512c1ad2efc5860664c3f51863fcec0c
[OK] All nodes agree about slots configuration.
>>> Check for open slots...
>>> Check slots coverage...
[OK] All 16384 slots covered.
>>> Send CLUSTER MEET to node 10.10.87.242:6308 to make it join the cluster.
Waiting for the cluster to join.
>>> Configure node as replica of 10.10.87.242:6307.
[OK] New node added correctly.

查看一下 集群的 node 列表 

[root@localhost 6308]# /usr/local/bin/redis-trib.rb check 10.10.87.241:6301
>>> Performing Cluster Check (using node 10.10.87.241:6301)
M: 9f9ceaf702e9c1d95da48bdf98663b6920125a67 10.10.87.241:6301
   slots:1499-5460 (3962 slots) master
   1 additional replica(s)
M: a96908e1e53fcf01d148f2af2dbcbb6a35361a9e 10.10.87.242:6307
   slots:0-1498,5461-6961 (3000 slots) master
   1 additional replica(s)
M: cd53abf0512c1ad2efc5860664c3f51863fcec0c 10.10.87.241:6302
   slots:10923-16383 (5461 slots) master
   1 additional replica(s)
S: f13dab343c659994d007eab8a795d18fd01e74a5 10.10.87.242:6304
   slots: (0 slots) slave
   replicates cd1c9f7eee311628cc271c2a8d2614602f773d90
S: 9a1113a8c3adb0bc77e7ef5d251e4032d9a7213c 10.10.87.242:6308
   slots: (0 slots) slave
   replicates a96908e1e53fcf01d148f2af2dbcbb6a35361a9e
S: cc4cc5c9563dde84554be4eccd93e9f261ce858d 10.10.87.242:6305
   slots: (0 slots) slave
   replicates 9f9ceaf702e9c1d95da48bdf98663b6920125a67
M: cd1c9f7eee311628cc271c2a8d2614602f773d90 10.10.87.241:6303
   slots:6962-10922 (3961 slots) master
   1 additional replica(s)
S: 6e00bd4162e241d5f238f948349021493d4a98df 10.10.87.242:6306
   slots: (0 slots) slave
   replicates cd53abf0512c1ad2efc5860664c3f51863fcec0c
[OK] All nodes agree about slots configuration.
>>> Check for open slots...
>>> Check slots coverage...
[OK] All 16384 slots covered.

 

删除 slave从节点

# 删除slave从节点
[root@localhost 6308]# /usr/local/bin/redis-trib.rb del-node 10.10.87.242:6308 0de7036effb94e8487a9a17d424efd26f3d36cae
>>> Removing node 0de7036effb94e8487a9a17d424efd26f3d36cae from cluster 10.10.87.242:6308
>>> Sending CLUSTER FORGET messages to the cluster...
>>> SHUTDOWN the node.

# 查看节点数
[root@localhost 6308]# /usr/local/bin/redis-trib.rb check 10.10.87.241:6301
>>> Performing Cluster Check (using node 10.10.87.241:6301)
M: 9f9ceaf702e9c1d95da48bdf98663b6920125a67 10.10.87.241:6301
   slots:1499-5460 (3962 slots) master
   1 additional replica(s)
M: a96908e1e53fcf01d148f2af2dbcbb6a35361a9e 10.10.87.242:6307
   slots:0-1498,5461-6961 (3000 slots) master
   0 additional replica(s)
M: cd53abf0512c1ad2efc5860664c3f51863fcec0c 10.10.87.241:6302
   slots:10923-16383 (5461 slots) master
   1 additional replica(s)
S: f13dab343c659994d007eab8a795d18fd01e74a5 10.10.87.242:6304
   slots: (0 slots) slave
   replicates cd1c9f7eee311628cc271c2a8d2614602f773d90
S: cc4cc5c9563dde84554be4eccd93e9f261ce858d 10.10.87.242:6305
   slots: (0 slots) slave
   replicates 9f9ceaf702e9c1d95da48bdf98663b6920125a67
M: cd1c9f7eee311628cc271c2a8d2614602f773d90 10.10.87.241:6303
   slots:6962-10922 (3961 slots) master
   1 additional replica(s)
S: 6e00bd4162e241d5f238f948349021493d4a98df 10.10.87.242:6306
   slots: (0 slots) slave
   replicates cd53abf0512c1ad2efc5860664c3f51863fcec0c
[OK] All nodes agree about slots configuration.
>>> Check for open slots...
>>> Check slots coverage...
[OK] All 16384 slots covered.

删除master节点

首先把要删除master节点的 slot卡槽全部提取到别的master节点上

 

# 我们要把 6307 的卡槽全部提取到 6301上去

[root@localhost 6308]# /usr/local/bin/redis-trib.rb reshard 10.10.87.241:6301
>>> Performing Cluster Check (using node 10.10.87.241:6301)
M: 9f9ceaf702e9c1d95da48bdf98663b6920125a67 10.10.87.241:6301
   slots:1499-5460 (3962 slots) master
   1 additional replica(s)
M: a96908e1e53fcf01d148f2af2dbcbb6a35361a9e 10.10.87.242:6307
   slots:0-1498,5461-6961 (3000 slots) master
   1 additional replica(s)
M: cd53abf0512c1ad2efc5860664c3f51863fcec0c 10.10.87.241:6302
   slots:10923-16383 (5461 slots) master
   1 additional replica(s)
S: f13dab343c659994d007eab8a795d18fd01e74a5 10.10.87.242:6304
   slots: (0 slots) slave
   replicates cd1c9f7eee311628cc271c2a8d2614602f773d90
S: 9a1113a8c3adb0bc77e7ef5d251e4032d9a7213c 10.10.87.242:6308
   slots: (0 slots) slave
   replicates a96908e1e53fcf01d148f2af2dbcbb6a35361a9e
S: cc4cc5c9563dde84554be4eccd93e9f261ce858d 10.10.87.242:6305
   slots: (0 slots) slave
   replicates 9f9ceaf702e9c1d95da48bdf98663b6920125a67
M: cd1c9f7eee311628cc271c2a8d2614602f773d90 10.10.87.241:6303
   slots:6962-10922 (3961 slots) master
   1 additional replica(s)
S: 6e00bd4162e241d5f238f948349021493d4a98df 10.10.87.242:6306
   slots: (0 slots) slave
   replicates cd53abf0512c1ad2efc5860664c3f51863fcec0c
[OK] All nodes agree about slots configuration.
>>> Check for open slots...
>>> Check slots coverage...
[OK] All 16384 slots covered.
How many slots do you want to move (from 1 to 16384)? 3000       ###需要提取的卡槽数量
What is the receiving node ID? 9f9ceaf702e9c1d95da48bdf98663b6920125a67 ###接收的节点id
Please enter all the source node IDs.
  Type 'all' to use all the nodes as source nodes for the hash slots.
  Type 'done' once you entered all the source nodes IDs.
Source node #1:a96908e1e53fcf01d148f2af2dbcbb6a35361a9e ###提取的节点id
Source node #2:done

查看集群详情

[root@localhost 6308]# /usr/local/bin/redis-trib.rb check 10.10.87.241:6301
>>> Performing Cluster Check (using node 10.10.87.241:6301)
M: 9f9ceaf702e9c1d95da48bdf98663b6920125a67 10.10.87.241:6301
   slots:0-6917 (6918 slots) master
   1 additional replica(s)
M: a96908e1e53fcf01d148f2af2dbcbb6a35361a9e 10.10.87.242:6307
   slots: (0 slots) master
   0 additional replica(s)
M: cd53abf0512c1ad2efc5860664c3f51863fcec0c 10.10.87.241:6302
   slots:10923-16383 (5461 slots) master
   1 additional replica(s)
S: f13dab343c659994d007eab8a795d18fd01e74a5 10.10.87.242:6304
   slots: (0 slots) slave
   replicates cd1c9f7eee311628cc271c2a8d2614602f773d90
S: 9a1113a8c3adb0bc77e7ef5d251e4032d9a7213c 10.10.87.242:6308
   slots: (0 slots) slave
   replicates cd1c9f7eee311628cc271c2a8d2614602f773d90
S: cc4cc5c9563dde84554be4eccd93e9f261ce858d 10.10.87.242:6305
   slots: (0 slots) slave
   replicates 9f9ceaf702e9c1d95da48bdf98663b6920125a67
M: cd1c9f7eee311628cc271c2a8d2614602f773d90 10.10.87.241:6303
   slots:6918-10922 (4005 slots) master
   2 additional replica(s)
S: 6e00bd4162e241d5f238f948349021493d4a98df 10.10.87.242:6306
   slots: (0 slots) slave
   replicates cd53abf0512c1ad2efc5860664c3f51863fcec0c
[OK] All nodes agree about slots configuration.
>>> Check for open slots...
>>> Check slots coverage...
[OK] All 16384 slots covered.

删除 6307 master节点

[root@localhost 6308]# /usr/local/bin/redis-trib.rb del-node 10.10.87.242:6307 a96908e1e53fcf01d148f2af2dbcbb6a35361a9e
>>> Removing node a96908e1e53fcf01d148f2af2dbcbb6a35361a9e from cluster 10.10.87.242:6307
>>> Sending CLUSTER FORGET messages to the cluster...
>>> SHUTDOWN the node.

查看详情

[root@localhost 6308]# /usr/local/bin/redis-trib.rb check 10.10.87.241:6301
>>> Performing Cluster Check (using node 10.10.87.241:6301)
M: 9f9ceaf702e9c1d95da48bdf98663b6920125a67 10.10.87.241:6301
   slots:0-6917 (6918 slots) master
   1 additional replica(s)
M: cd53abf0512c1ad2efc5860664c3f51863fcec0c 10.10.87.241:6302
   slots:10923-16383 (5461 slots) master
   1 additional replica(s)
S: f13dab343c659994d007eab8a795d18fd01e74a5 10.10.87.242:6304
   slots: (0 slots) slave
   replicates cd1c9f7eee311628cc271c2a8d2614602f773d90
S: 9a1113a8c3adb0bc77e7ef5d251e4032d9a7213c 10.10.87.242:6308
   slots: (0 slots) slave
   replicates cd1c9f7eee311628cc271c2a8d2614602f773d90
S: cc4cc5c9563dde84554be4eccd93e9f261ce858d 10.10.87.242:6305
   slots: (0 slots) slave
   replicates 9f9ceaf702e9c1d95da48bdf98663b6920125a67
M: cd1c9f7eee311628cc271c2a8d2614602f773d90 10.10.87.241:6303
   slots:6918-10922 (4005 slots) master
   2 additional replica(s)
S: 6e00bd4162e241d5f238f948349021493d4a98df 10.10.87.242:6306
   slots: (0 slots) slave
   replicates cd53abf0512c1ad2efc5860664c3f51863fcec0c
[OK] All nodes agree about slots configuration.
>>> Check for open slots...
>>> Check slots coverage...
[OK] All 16384 slots covered.

 

如果 reshard 迁移slot 报 migrating 错误

>>> Check for open slots...
[WARNING] Node 10.10.87.241:6301 has slots in importing state (6918).
[WARNING] Node 10.10.87.242:6307 has slots in migrating state (6918).
[WARNING] The following slots are open: 6918
>>> Check slots coverage...

可以使用下面命令清除

# 我们操作是把 10.10.87.242:6307 中的slot卡槽提取到 10.10.87.241:6301 中去

# 因为 slot 卡槽号 6918 是从 10.10.87.242:6307 中获取的
# 首先到 10.10.87.242:6307 中 删除 卡槽是6918的缓存 key
# 再重新 setslot
# 按 ctrl+c 退出

[root@localhost 6308]# /usr/local/redis/src/redis-cli -h 10.10.87.242 -p 6307 -c
10.10.87.242:6307> keys *
1) "test"
10.10.87.242:6307> cluster keyslot test
(integer) 6918
10.10.87.242:6307> del test
(integer) 1
10.10.87.242:6307> cluster setslot 6918 stable
OK
10.10.87.242:6307> 

# 再 10.10.87.241:6301 中 删除该缓存 key
# 再重新 setslot
# 按 ctrl+c 退出

[root@localhost 6301]# /usr/local/redis/src/redis-cli -h 10.10.87.241 -p 6301 -c
10.10.87.241:6301> cluster setslot 6918 stable
OK
10.10.87.241:6301> 

# 最后使用 fix 命令修复集群即可
[root@localhost 6308]# /usr/local/bin/redis-trib.rb fix 10.10.87.241:6301

参考：

https://blog.csdn.net/phantom_111/article/details/80328049

http://blog.51cto.com/13690439/2120025

https://blog.csdn.net/wuxu_nanjing/article/details/77330568