Redis集群宕机恢复集群状态

待我称王封你为后i 2023-02-21 06:40 4阅读 0赞

**一、问题简述**

1.  最近在修复Redis环境漏洞过程中，修改了其中一台linux主机上的两个Redis结点的配置文件，导致后续结点重启失败。

**二、部署方式**

1.  使用三台不同的linux主机来完成Redis6个结点的部署(三主三从)。
2.  由下图所示

<table> 
 <thead> 
  <tr> 
   <th>host</th> 
   <th>port</th> 
   <th>nodeType</th> 
  </tr> 
 </thead> 
 <tbody> 
  <tr> 
   <td>111.229.96.162</td> 
   <td>7000/7001</td> 
   <td>master/slaver</td> 
  </tr> 
  <tr> 
   <td>111.229.96.163</td> 
   <td>7002/7003</td> 
   <td>slaver/slaver</td> 
  </tr> 
  <tr> 
   <td>111.229.96.164</td> 
   <td>7004/7005</td> 
   <td>master/master</td> 
  </tr> 
 </tbody> 
</table>

1.  结点类型可通过如下命令查看

#redis连接 -c：以集群的方式连接 -h：主机ip地址 -p：ip端口
    #错误演示 
    [ml@inmshgis13 src]$ ./redis-cli -h 111.229.96.164 -p 7005
    111.229.96.164:7005> get name
    (error) MOVED 5798 111.229.96.164:7005
    // 最好是加上-c
    [ml@inmshgis13 src]$ ./redis-cli -c -h 111.229.96.164 -p 7005
    111.229.96.164:7005> info replication
    # Replication
    role:slave
    master_host:111.229.96.164
    master_port:7005
    master_link_status:up
    master_last_io_seconds_ago:0
    master_sync_in_progress:0
    slave_repl_offset:2728687610
    slave_priority:100
    slave_read_only:1
    connected_slaves:0
    master_replid:33049affb1e8c1cc3cc54e0250532a94c921e78e
    master_replid2:0000000000000000000000000000000000000000
    master_repl_offset:2728687610
    second_repl_offset:-1
    repl_backlog_active:1
    repl_backlog_size:1048576
    repl_backlog_first_byte_offset:2727639035
    repl_backlog_histlen:1048576

**三、启动步骤**  
/gis/redis/redis/redis\_cluster/7000

1.  分别启动三台linux主机上的redis结点

[ml@inmshgis13 ~]$ cd /gis/redis/redis/src
    [ml@inmshgis13 src]$ ./redis-server /gis/redis/redis/redis_cluster/7000/redis.conf
    [ml@inmshgis13 src]$ ./redis-server /gis/redis/redis/redis_cluster/7001/redis.conf
    ...

1.  生成集群

[ml@inmshgis13 src]$ ./redis-trib.rb create --replicas 1 111.229.96.162:7000 111.229.96.162:7001 111.229.96.163:7002 111.229.96.163:7003 111.229.96.164:7004 111.229.96.164:7005

1.  查看集群状态

111.229.96.164:7005> cluster info
    cluster_state:ok  //集群启动成功标志 失败为fail
    cluster_slots_assigned:16384
    cluster_slots_ok:16384
    cluster_slots_pfail:0
    cluster_slots_fail:0
    cluster_known_nodes:6
    cluster_size:3
    cluster_current_epoch:14
    cluster_my_epoch:5
    cluster_stats_messages_ping_sent:87052
    cluster_stats_messages_pong_sent:83735
    cluster_stats_messages_sent:170787
    cluster_stats_messages_ping_received:83735
    cluster_stats_messages_pong_received:87052
    cluster_stats_messages_received:170787