Redis配置文件解析

Units单位：

# Redis configuration file example

# 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.

1、配置大小单位，开头定义了一些基本的度量单位，只支持bytes，不支持bit

2、对大小写不敏感

################################ GENERAL (通用)##############################

# On Windows, daemonize and pidfile are not supported.

# However, you can run redis as a Windows service, and specify a logfile.

# The logfile will contain the pid.

# Accept connections on the specified port, default is 6379.

# If port 0 is specified Redis will not listen on a TCP socket.

port 6379

在这里指定端口号

# 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

tcp-backlog其实是一个连接队列，backlog队列总和=未完成的三次握手队列+已完成的三次握手队列。在高并发情况下，需要一个高backlog值来避免慢客户端连接问题。注意Linux内核会将这个值减小到/proc/sys/net/core/somaxconn的值，所以需要确认增大somaxconnn和tccp_max_syn_backlog两个值来达到想要的效果。

# 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

reids的四个日志级别：debug verbose notice warning

# 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

Redis默认右16个数据库

# 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

是否启用LZF压缩算法。

# 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

在存储数据快照后，还可以redis使用CRC64算法来进行数据校验，但是这样会增大大约10%的性能消耗，如果希望获取最大的性能提升，可以关闭此功能。

# The filename where to dump the DB

dbfilename dump.rdb

数据快照存储的文件

# 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 ./

数据快照文件存放的地址可以使用config get dir命令获得

################################ SNAPSHOTTING (快照)##########################

# 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 "" 禁用指令

save 900 1 15min改了1次

save 300 10 5分钟改了10次

save 60 10000 1分钟1改了10000次

save 秒数写操作次数

# 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

如果配置成no，表示不在乎数据不一致性或者有其他手段发现和控制

################################## SECURITY (安全)#############################

# Require clients to issueAUTH 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

requirepass zuo159951

在这里设置密码

################################### LIMITS (限制)###########################

# 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

客户端最大连接量

# MAXMEMORY POLICY: how Redis will select what to remove when maxmemory

# is reached. You can select among five behaviors:

#缓存过期策略（五种）

Redis配置文件解析

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