手把手redis集群的搭建

╰半橙微兮° 2022-06-18 04:37 180阅读 0赞

一:redis-cluster架构图  
![这里写图片描述][SouthEast]  
架构细节:  
(1)所有的redis节点彼此互联(PING-PONG机制),内部使用二进制协议优化传输速度和带宽.  
(2)节点的fail是通过集群中超过半数的节点检测失效时才生效.  
(3)客户端与redis节点直连,不需要中间proxy层.客户端不需要连接集群所有节点,连接集群中任何一个可用节点即可  
(4)redis-cluster把所有的物理节点映射到\[0-16383\]slot上,cluster 负责维护node<->slot<->value  
Redis 集群中内置了 16384 个哈希槽，当需要在 Redis 集群中放置一个 key-value 时，redis 先对 key 使用 crc16 算法算出一个结果，然后把结果对 16384 求余数，这样每个 key 都会对应一个编号在 0-16383 之间的哈希槽，redis 会根据节点数量大致均等的将哈希槽映射到不同的节点

二:Redis集群的搭建  
2.1. 集群搭建环境

1、使用ruby脚本搭建集群。需要ruby的运行环境。
    安装ruby
    yum install ruby
    yum install rubygems
    
    2、安装ruby脚本运行使用的包。
    [root@localhost ~]# gem install redis-3.0.0.gem 
    Successfully installed redis-3.0.0
    1 gem installed
    Installing ri documentation for redis-3.0.0...
    Installing RDoc documentation for redis-3.0.0...
    [root@localhost ~]# 
    
    [root@localhost ~]# cd redis-3.0.0/src
    [root@localhost src]# ll *.rb
    -rwxrwxr-x. 1 root root 48141 Apr  1  2015 redis-trib.rb

2.2. 搭建步骤  
需要6台redis服务器。搭建伪分布式。  
需要6个redis实例。  
需要运行在不同的端口7001-7006

第一步：创建6个redis实例，每个实例运行在不同的端口。需要修改redis.conf配置文件。配置文件中还需要把cluster-enabled yes前的注释去掉。  
![SouthEast 1][]

第二步：启动每个redis实例。  
第三步：使用ruby脚本搭建集群。

./redis-trib.rb create --replicas 1 192.168.25.153:7001 192.168.25.153:7002 192.168.25.153:7003 192.168.25.153:7004 192.168.25.153:7005 192.168.25.153:7006

创建关闭集群的脚本：
    [root@localhost redis-cluster]# vim shutdow-all.sh
    redis01/redis-cli -p 7001 shutdown
    redis01/redis-cli -p 7002 shutdown
    redis01/redis-cli -p 7003 shutdown
    redis01/redis-cli -p 7004 shutdown
    redis01/redis-cli -p 7005 shutdown
    redis01/redis-cli -p 7006 shutdown
    [root@localhost redis-cluster]# chmod u+x shutdow-all.sh 
    
    [root@localhost redis-cluster]# ./redis-trib.rb create --replicas 1 192.168.25.153:7001 192.168.25.153:7002 192.168.25.153:7003 192.168.25.153:7004 192.168.25.153:7005 192.168.25.153:7006 >>> Creating cluster Connecting to node 192.168.25.153:7001: OK Connecting to node 192.168.25.153:7002: OK Connecting to node 192.168.25.153:7003: OK Connecting to node 192.168.25.153:7004: OK Connecting to node 192.168.25.153:7005: OK Connecting to node 192.168.25.153:7006: OK >>> Performing hash slots allocation on 6 nodes... Using 3 masters: 192.168.25.153:7001 192.168.25.153:7002 192.168.25.153:7003 Adding replica 192.168.25.153:7004 to 192.168.25.153:7001 Adding replica 192.168.25.153:7005 to 192.168.25.153:7002 Adding replica 192.168.25.153:7006 to 192.168.25.153:7003 M: 2e48ae301e9c32b04a7d4d92e15e98e78de8c1f3 192.168.25.153:7001 slots:0-5460 (5461 slots) master M: 8cd93a9a943b4ef851af6a03edd699a6061ace01 192.168.25.153:7002 slots:5461-10922 (5462 slots) master M: 2935007902d83f20b1253d7f43dae32aab9744e6 192.168.25.153:7003 slots:10923-16383 (5461 slots) master S: 74f9d9706f848471583929fc8bbde3c8e99e211b 192.168.25.153:7004 replicates 2e48ae301e9c32b04a7d4d92e15e98e78de8c1f3 S: 42cc9e25ebb19dda92591364c1df4b3a518b795b 192.168.25.153:7005 replicates 8cd93a9a943b4ef851af6a03edd699a6061ace01 S: 8b1b11d509d29659c2831e7a9f6469c060dfcd39 192.168.25.153:7006 replicates 2935007902d83f20b1253d7f43dae32aab9744e6 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 192.168.25.153:7001) M: 2e48ae301e9c32b04a7d4d92e15e98e78de8c1f3 192.168.25.153:7001 slots:0-5460 (5461 slots) master M: 8cd93a9a943b4ef851af6a03edd699a6061ace01 192.168.25.153:7002 slots:5461-10922 (5462 slots) master M: 2935007902d83f20b1253d7f43dae32aab9744e6 192.168.25.153:7003 slots:10923-16383 (5461 slots) master M: 74f9d9706f848471583929fc8bbde3c8e99e211b 192.168.25.153:7004 slots: (0 slots) master replicates 2e48ae301e9c32b04a7d4d92e15e98e78de8c1f3 M: 42cc9e25ebb19dda92591364c1df4b3a518b795b 192.168.25.153:7005 slots: (0 slots) master replicates 8cd93a9a943b4ef851af6a03edd699a6061ace01 M: 8b1b11d509d29659c2831e7a9f6469c060dfcd39 192.168.25.153:7006 slots: (0 slots) master replicates 2935007902d83f20b1253d7f43dae32aab9744e6 [OK] All nodes agree about slots configuration. >>> Check for open slots... >>> Check slots coverage... [OK] All 16384 slots covered. [root@localhost redis-cluster]#

[SouthEast]: /images/20220618/b11ca4a767ce4cca91a62eaf405b2e18.png
[SouthEast 1]: /images/20220618/eb10a0e0eba046a7b072a472f46e9f61.png