三十三、redis-trib构建集群

水深无声 2022-05-14 23:28 338阅读 0赞

\#                                          redis-trib构建集群

\#\#\#1、开启所有节点  
移动redis-trib到指定目录：

cp  /opt/module/redis-4.0.11/src/redis-trib.rb  /usr/local/bin

如下配置8000-8005节点的配置文件：

#redis基本配置
    port 8000
    daemonize yes
    pidfile /var/run/redis-8000.pid
    dir /opt/module/redis-4.0.11/data
    logfile "8000.log"
    dbfilename "dump-8000.rdb"
    protected-mode no
    bind 192.168.1.108
    
    #集群开关，默认是不开启集群模式。
    cluster-enabled yes
    
    #集群配置文件的名称，每个节点都有一个集群相关的配置文件，持久化保存集群的信息。
    #这个文件并不需要手动配置，这个配置文件有Redis生成并更新，每个Redis集群节点需要一个单独的配置文件，
    #请确保与实例运行的系统中配置文件名称不冲突
    cluster-config-file nodes-8000.conf
    
    #默认情况下，集群全部的slot有节点负责，集群状态才为ok，才能提供服务。设置为no，可以在slot没有全部分配的时候提供服务。
    #不建议打开该配置，这样会造成分区的时候，小分区的master一直在接受写请求，而造成很长时间数据不一致。
    #就是有一个节点挂了这个集群还能使用
    cluster-require-full-coverage no

其五个请模仿这个配置写。

主从关系：

主：8000  ---->8003
    主：8001  ---->8004
    主：8002  ---->8005
    
    *replicate 后是主节点ID，通过redis-cli -p 7000 cluster nodes查询。

启动6个节点：

redis-server redis-8000.conf
    redis-server redis-8001.conf
    redis-server redis-8002.conf
    redis-server redis-8003.conf
    redis-server redis-8004.conf
    redis-server redis-8005.conf

查看进程是否启动：

ps -ef | grep redis-server

结果：

[root@data2 config]# ps -ef |grep redis-server
    root      3425     1  1 09:00 ?        00:00:00 redis-server *:8000 [cluster]
    root      3427     1  1 09:00 ?        00:00:00 redis-server *:8001 [cluster]
    root      3429     1  1 09:00 ?        00:00:00 redis-server *:8002 [cluster]
    root      3431     1  1 09:00 ?        00:00:00 redis-server *:8003 [cluster]
    root      3442     1  0 09:00 ?        00:00:00 redis-server *:8004 [cluster]
    root      3450     1  0 09:00 ?        00:00:00 redis-server *:8005 [cluster]
    root      3472  3220  0 09:01 pts/0    00:00:00 grep redis-server

\#\#\#2、使用redis-trib  
进入目录：

cd /opt/module/redis-4.0.11/src/

查看命令：

[root@data2 src]# ./redis-trib.rb 
    Usage: redis-trib <command> <options> <arguments ...>
    
      rebalance       host:port
                      --auto-weights
                      --threshold <arg>
                      --simulate
                      --weight <arg>
                      --use-empty-masters
                      --pipeline <arg>
                      --timeout <arg>
      import          host:port
                      --from <arg>
                      --replace
                      --copy
      reshard         host:port
                      --slots <arg>
                      --to <arg>
                      --from <arg>
                      --yes
                      --pipeline <arg>
                      --timeout <arg>
      set-timeout     host:port milliseconds
      info            host:port
      fix             host:port
                      --timeout <arg>
      create          host1:port1 ... hostN:portN
                      --replicas <arg>
      help            (show this help)
      call            host:port command arg arg .. arg
      del-node        host:port node_id
      add-node        new_host:new_port existing_host:existing_port
                      --slave
                      --master-id <arg>
      check           host:port
    
    For check, fix, reshard, del-node, set-timeout you can specify the host and port of any working node in the cluster.

使用creat命令创建集群（–replicas 1标识一个主节点创建一个 从节点）：

./redis-trib.rb create --replicas 1 192.168.1.108:8000 192.168.1.108:8001 192.168.1.108:8002 192.168.1.108:8003 192.168.1.108:8004 192.168.1.108:8005

执行结果：

>>> Creating cluster
    >>> Performing hash slots allocation on 6 nodes...
    Using 3 masters:
    127.0.0.1:8000
    127.0.0.1:8001
    127.0.0.1:8002
    Adding replica 127.0.0.1:8004 to 127.0.0.1:8000
    Adding replica 127.0.0.1:8005 to 127.0.0.1:8001
    Adding replica 127.0.0.1:8003 to 127.0.0.1:8002
    >>> Trying to optimize slaves allocation for anti-affinity
    [WARNING] Some slaves are in the same host as their master
    M: a2d034b74c9cec4cd8398e8b23ae2d2ab124d49d 127.0.0.1:8000
       slots:0-5460 (5461 slots) master
    M: 1f0d813205ea17d9b254488215bd48612c0ff2b5 127.0.0.1:8001
       slots:5461-10922 (5462 slots) master
    M: f5960002d40cf3711eca7146719c4f568115f76c 127.0.0.1:8002
       slots:10923-16383 (5461 slots) master
    S: 9d1cb9fea95f1b205fc7a5ecb20125259765d6ca 127.0.0.1:8003
       replicates a2d034b74c9cec4cd8398e8b23ae2d2ab124d49d
    S: 93ae6d9a42bf485a955d2387b0a0d659e2c12902 127.0.0.1:8004
       replicates 1f0d813205ea17d9b254488215bd48612c0ff2b5
    S: fd17cbac4a5ca1942490d3734a73387341e80fb7 127.0.0.1:8005
       replicates f5960002d40cf3711eca7146719c4f568115f76c
    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 127.0.0.1:8000)
    M: a2d034b74c9cec4cd8398e8b23ae2d2ab124d49d 127.0.0.1:8000
       slots:0-5460 (5461 slots) master
       1 additional replica(s)
    M: f5960002d40cf3711eca7146719c4f568115f76c 127.0.0.1:8002
       slots:10923-16383 (5461 slots) master
       1 additional replica(s)
    M: 1f0d813205ea17d9b254488215bd48612c0ff2b5 127.0.0.1:8001
       slots:5461-10922 (5462 slots) master
       1 additional replica(s)
    S: 93ae6d9a42bf485a955d2387b0a0d659e2c12902 127.0.0.1:8004
       slots: (0 slots) slave
       replicates 1f0d813205ea17d9b254488215bd48612c0ff2b5
    S: fd17cbac4a5ca1942490d3734a73387341e80fb7 127.0.0.1:8005
       slots: (0 slots) slave
       replicates f5960002d40cf3711eca7146719c4f568115f76c
    S: 9d1cb9fea95f1b205fc7a5ecb20125259765d6ca 127.0.0.1:8003
       slots: (0 slots) slave
       replicates a2d034b74c9cec4cd8398e8b23ae2d2ab124d49d
    [OK] All nodes agree about slots configuration.
    >>> Check for open slots...
    >>> Check slots coverage...
    [OK] All 16384 slots covered.

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