redis-3.0.2集群部署

Redis 集群安装


集群搭建步骤

1、创建多个节点.

2、为每个节点指派槽,并将多个节点连接起来,组成一个集群.

3、当集群数据库的16384个槽都有节点在处理时,集群进入上线状态.

要求:搭建一个包含6个节点的Redis集群,其中三个主节点,三个从节点,每个主节点都有一个从节点

注:在极端情况下,如果将16384个槽都指派给一个主节点,那么只有一个主节点也可以让集群进入上线状态,但是要让集群的故障转移特性生效,最起码要有3个主节点,而要让故障转移真正有意义,至少要为三个主节点分别设置一个从节点,这也是本例子中使用6个节点的原因。

1. 下载安装:

redis install :

a) Wget http://download.redis.io/releases/redis-3.0.2.tar.gz

b) Tar xzvf redis-3.0.2.tar.gz

c) Make

d) Make install


    ruby install:

    a)yum install ruby

    b)yum install rubygems

    c)gem install -l redis-3.0.0.gem

    

2. 搭建集群:

  为了让Redis服务器以集群模式运行,我们需要在启动服务器时,打开服务器的集群模式选项:

  cluster-enabled yes

 另外,如果有多个节点运行在同一台集群上,那么我们还需要为每个节点指定一个不同的端口号

 port 7000

 将如上的两个配置值写入redis.conf文件中,然后执行如下命令来启动一个Redis节点

 redis-server redis.conf


    

redis.conf配置文件如下:

daemonize no

tcp-backlog 511

timeout 0

tcp-keepalive 0

loglevel notice

databases 32

save 900 1

save 300 10

save 60 10000

stop-writes-on-bgsave-error yes

rdbcompression yes

rdbchecksum yes

dir "/usr/local/redis/var"

slave-serve-stale-data yes

slave-read-only yes

repl-diskless-sync no

repl-diskless-sync-delay 5

repl-disable-tcp-nodelay no

slave-priority 100

appendonly no

appendfsync everysec

no-appendfsync-on-rewrite no

auto-aof-rewrite-percentage 100

auto-aof-rewrite-min-size 64mb

aof-load-truncated yes

lua-time-limit 5000

slowlog-log-slower-than 10000

slowlog-max-len 128

latency-monitor-threshold 0

notify-keyspace-events ""

hash-max-ziplist-entries 512

hash-max-ziplist-value 64

list-max-ziplist-entries 512

list-max-ziplist-value 64

set-max-intset-entries 512

zset-max-ziplist-entries 128

zset-max-ziplist-value 64

hll-sparse-max-bytes 3000

activerehashing yes

client-output-buffer-limit normal 0 0 0

client-output-buffer-limit slave 256mb 64mb 60

client-output-buffer-limit pubsub 32mb 8mb 60

hz 10

aof-rewrite-incremental-fsync yes


#打开redis集群

cluster-enabled yes

#节点互连超时的阀值

cluster-node-timeout 15000

cluster-migration-barrier 1


#cluster配置文件

cluster-config-file /usr/local/redis/var/nodes-7000.conf


#不同端口设置

pidfile /var/run/redis_7000.pid

port 7000

logfile "/var/log/redis_7000.log"

dbfilename dump-7000.rdb

appendfilename "appendonly-7000.aof"



a) 准备redis.conf  ,使用以下脚本.

#!/bin/bash

FilePath="/etc/redis_cluster"

mkdir -p $FilePath

for i in `seq -w 0 5`

do

   cp redis.conf $FilePath/700$i.conf

   sed -i "s#port 7000#port 700$i#g" $FilePath/700$i.conf

   sed -i "s#pidfile /var/run/redis_7000.pid#pidfile /var/run/redis_700$i.pid/g" $FilePath/700$i.conf

   sed -i "s#logfile \"/var/log/redis_7000.log\"#logfile \"/var/log/redis_700$i.log/g\" $FilePath/700$i.conf

   sed -i "s#cluster-config-file /usr/local/redis/var/nodes-7000.conf#cluster-config-file /usr/local/redis/var/nodes-700$i.conf/g" $FilePath/700$i.conf

   sed -i "s#dbfilename dump-7000.rdb#dbfilename dump-700$i.rdb#g" $FilePath/700$i.conf

   sed -i "s#appendfilename \"appendonly-7000.aof\"#appendfilename \"appendonly-700$i.aof\"#g" $FilePath/700$i.conf

Done

   

b) 启动 redis 节点

#!/bin/bash

FilePath="/etc/redis_cluster"

for i in `seq -w 0 5`;do

   redis-server $FilePath/700$i.conf

done

c) 判断各个节点的Redis服务是否启动成功:

wKiom1WmC8nxmO8rAAD2OHc44ko940.jpg

d) 创建Redis Cluster

wKiom1WmC8mTEluKAADl8CxML30573.jpg

[root@linux6_TEST src]# ./redis-trib.rb create --replicas 1 127.0.0.1:7000 127.0.0.1:7001 127.0.0.1:7002 127.0.0.1:7003 127.0.0.1:7004 127.0.0.1:7005

>>> Creating cluster

Connecting to node 127.0.0.1:7000: OK

Connecting to node 127.0.0.1:7001: OK

Connecting to node 127.0.0.1:7002: OK

Connecting to node 127.0.0.1:7003: OK

Connecting to node 127.0.0.1:7004: OK

Connecting to node 127.0.0.1:7005: OK

>>> Performing hash slots allocation on 6 nodes...

Using 3 masters:

127.0.0.1:7000

127.0.0.1:7001

127.0.0.1:7002

Adding replica 127.0.0.1:7003 to 127.0.0.1:7000

Adding replica 127.0.0.1:7004 to 127.0.0.1:7001

Adding replica 127.0.0.1:7005 to 127.0.0.1:7002

M: 8bd14c65c633af4ddc52a8c254f4ae16ecc1445d 127.0.0.1:7000

  slots:0-5460 (5461 slots) master

M: a39f2fb7b03f3cb95bfefb52a40003f5d3514b94 127.0.0.1:7001

  slots:5461-10922 (5462 slots) master

M: e2683986eb936f09265059b24422d23e97123467 127.0.0.1:7002

  slots:10923-16383 (5461 slots) master

S: 446fbf7cabb22d920478f17490af8bf938ed27a3 127.0.0.1:7003

  replicates 8bd14c65c633af4ddc52a8c254f4ae16ecc1445d

S: 4f8a7495220047080f557e64f1a5f1ef2e34c13d 127.0.0.1:7004

  replicates a39f2fb7b03f3cb95bfefb52a40003f5d3514b94

S: 595c7b7971059cb204c28a5df729e5c7b3e39346 127.0.0.1:7005

  replicates e2683986eb936f09265059b24422d23e97123467

Can I set the above configuration? (type 'yes' to accept): yes

>>> Nodes configuration updated

>>> Assign a different config epoch to each node

>>> Sending CLUSTER MEET messages to join the cluster

Waiting for the cluster to join..

>>> Performing Cluster Check (using node 127.0.0.1:7000)

M: 8bd14c65c633af4ddc52a8c254f4ae16ecc1445d 127.0.0.1:7000

  slots:0-5460 (5461 slots) master

M: a39f2fb7b03f3cb95bfefb52a40003f5d3514b94 127.0.0.1:7001

  slots:5461-10922 (5462 slots) master

M: e2683986eb936f09265059b24422d23e97123467 127.0.0.1:7002

  slots:10923-16383 (5461 slots) master

M: 446fbf7cabb22d920478f17490af8bf938ed27a3 127.0.0.1:7003

  slots: (0 slots) master

  replicates 8bd14c65c633af4ddc52a8c254f4ae16ecc1445d

M: 4f8a7495220047080f557e64f1a5f1ef2e34c13d 127.0.0.1:7004

  slots: (0 slots) master

  replicates a39f2fb7b03f3cb95bfefb52a40003f5d3514b94

M: 595c7b7971059cb204c28a5df729e5c7b3e39346 127.0.0.1:7005

  slots: (0 slots) master

  replicates e2683986eb936f09265059b24422d23e97123467

[OK] All nodes agree about slots configuration.

>>> Check for open slots...

>>> Check slots coverage...

[OK] All 16384 slots covered.

###如果整个集群数据库的16384个槽都有节点在处理,那么集群就会进入上线状态,之后用户就可以开始向集群发送命令请求了

集群访问

使用集群客户端向集群发送命令请求

目前主要的 Redis 集群客户端(或者说,支持集群功能的 Redis 客户端)有以下这些:

1、redis-rb-cluster:antirez 使用 Ruby 编写的 Redis 集群客户端,集群客户端的官方实现;

2、predis:Redis 的 PHP 客户端,支持集群功能;

3、jedis:Redis 的 JAVA 客户端,支持集群功能;

4、StackExchange.Redis:Redis 的 C# 客户端,支持集群功能;

5、内置的 redis-cli :在启动时给定 -c 参数即可进入集群模式,支持部分集群功能;


数据备份:

  注意备份每个实例的 dump.rdb cluster 配置文件 cluster-config-file


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