Redis 复制及sentinel搭建

比眉伴天荒 2022-04-06 03:00 187阅读 0赞

采用的架构是1主2从3sentinel，端口分布如下：

<table> 
 <thead> 
  <tr> 
   <th>实例</th> 
   <th>端口</th> 
  </tr> 
 </thead> 
 <tbody> 
  <tr> 
   <td>主库</td> 
   <td>6379</td> 
  </tr> 
  <tr> 
   <td>从库</td> 
   <td>6380</td> 
  </tr> 
  <tr> 
   <td>从库</td> 
   <td>6381</td> 
  </tr> 
  <tr> 
   <td>sentinel1</td> 
   <td>26379</td> 
  </tr> 
  <tr> 
   <td>sentinel2</td> 
   <td>26380</td> 
  </tr> 
  <tr> 
   <td>sentinel3</td> 
   <td>26381</td> 
  </tr> 
 </tbody> 
</table>

**1.redis实例配置文件**  
主：

[root@redis conf]# cat redism.conf 
    port 6379
    daemonize yes
    logfile "/usr/local/conf/6379.log"
    dbfilename "data6379.rdb"
    dir "/usr/local/conf/"

从：

[root@redis conf]# cat rediss1.conf 
    port 6380
    daemonize yes
    logfile "/usr/local/redis/conf/6380.log"
    dbfilename "data6380.rdb"
    dir "/usr/local/redis/conf/"
    slaveof 127.0.0.1 6379
    
    [root@redis conf]# cat rediss2.conf 
    port 6381
    daemonize yes
    logfile "/usr/local/redis/conf/6381.log"
    dbfilename "data6381.rdb"
    dir "/usr/local/redis/conf/"
    slaveof 127.0.0.1 6379

**2.开启实例，建立主从关系**  
2.1启动实例

[root@redis conf]# redis-server /usr/local/redis/conf/redism.conf &
    [1] 2343
    [root@redis conf]# 
    [1]+  Done                    redis-server /usr/local/redis/conf/redism.conf
    [root@redis conf]# redis-server /usr/local/redis/conf/rediss1.conf &
    [1] 2363
    [root@redis conf]# 
    [1]+  Done                    redis-server /usr/local/redis/conf/rediss1.conf
    [root@redis conf]# 
    [root@redis conf]# 
    [root@redis conf]# redis-server /usr/local/redis/conf/rediss2.conf & 
    [1] 2370
    [root@redis conf]# 
    [1]+  Done                    redis-server /usr/local/redis/conf/rediss2.conf
    [root@redis conf]# ps -ef|grep redis
    root      2344     1  0 18:18 ?        00:00:00 redis-server *:6379                           
    root      2364     1  0 18:18 ?        00:00:00 redis-server *:6380                            
    root      2371     1  0 18:18 ?        00:00:00 redis-server *:6381                            
    root      2377  2253  0 18:18 pts/1    00:00:00 grep redis

2.2检查主从关系

[root@redis conf]# redis-cli -p 6379 info replication
    # Replication
    role:master
    connected_slaves:2
    slave0:ip=127.0.0.1,port=6380,state=online,offset=98,lag=1
    slave1:ip=127.0.0.1,port=6381,state=online,offset=98,lag=0
    master_replid:0258297c0e6120287ec943ce7fbd580e0e9435b4
    master_replid2:0000000000000000000000000000000000000000
    master_repl_offset:98
    second_repl_offset:-1
    repl_backlog_active:1
    repl_backlog_size:1048576
    repl_backlog_first_byte_offset:1
    repl_backlog_histlen:98
    
    [root@redis conf]# redis-cli -p 6380 info replication  
    # Replication
    role:slave
    master_host:127.0.0.1
    master_port:6379
    master_link_status:up
    master_last_io_seconds_ago:6
    master_sync_in_progress:0
    slave_repl_offset:112
    slave_priority:100
    slave_read_only:1
    connected_slaves:0
    master_replid:0258297c0e6120287ec943ce7fbd580e0e9435b4
    master_replid2:0000000000000000000000000000000000000000
    master_repl_offset:112
    second_repl_offset:-1
    repl_backlog_active:1
    repl_backlog_size:1048576
    repl_backlog_first_byte_offset:1
    repl_backlog_histlen:112
    
    [root@redis conf]# redis-cli -p 6381 info replication  
    # Replication
    role:slave
    master_host:127.0.0.1
    master_port:6379
    master_link_status:up
    master_last_io_seconds_ago:1
    master_sync_in_progress:0
    slave_repl_offset:126
    slave_priority:100
    slave_read_only:1
    connected_slaves:0
    master_replid:0258297c0e6120287ec943ce7fbd580e0e9435b4
    master_replid2:0000000000000000000000000000000000000000
    master_repl_offset:126
    second_repl_offset:-1
    repl_backlog_active:1
    repl_backlog_size:1048576
    repl_backlog_first_byte_offset:1
    repl_backlog_histlen:126

**3.sentinel配置文件**

[root@redis conf]# cat redis-sentinel26379.conf 
    port 26379
    daemonize yes
    logfile "sentinel26379.log"
    dir "/usr/local/redis/conf/"
    sentinel monitor mymaster 127.0.0.1 6379 2
    sentinel down-after-milliseconds mymaster 30000
    sentinel parallel-syncs mymaster 1
    sentinel failover-timeout mymaster 180000
    
    [root@redis conf]# cat redis-sentinel26380.conf 
    port 26380
    daemonize yes
    logfile "sentinel26380.log"
    dir "/usr/local/redis/conf/"
    sentinel monitor mymaster 127.0.0.1 6379 2
    sentinel down-after-milliseconds mymaster 30000
    sentinel parallel-syncs mymaster 1
    sentinel failover-timeout mymaster 180000
    
    [root@redis conf]# cat redis-sentinel26381.conf 
    port 26381
    daemonize yes
    logfile "sentinel26380.log"
    dir "/usr/local/redis/conf/"
    sentinel monitor mymaster 127.0.0.1 6379 2
    sentinel down-after-milliseconds mymaster 30000
    sentinel parallel-syncs mymaster 1
    sentinel failover-timeout mymaster 180000

**4.启动sentinel，检查运行状态**  
4.1启动sentinel

[root@redis conf]# redis-sentinel redis-sentinel26379.conf &
    [1] 2410
    [root@redis conf]# 
    [1]+  Done                    redis-sentinel redis-sentinel26379.conf
    
    [root@redis conf]# redis-sentinel redis-sentinel26380.conf &
    [1] 2416
    [root@redis conf]# 
    [1]+  Done                    redis-sentinel redis-sentinel26380.conf
    
    [root@redis conf]# redis-sentinel redis-sentinel26381.conf &
    [1] 2421
    [root@redis conf]# 
    [1]+  Done                    redis-sentinel redis-sentinel26381.conf
    
    [root@redis conf]# ps -ef|grep redis
    root      2344     1  0 18:18 ?        00:00:01 redis-server *:6379                           
    root      2364     1  0 18:18 ?        00:00:01 redis-server *:6380                            
    root      2371     1  0 18:18 ?        00:00:01 redis-server *:6381                            
    root      2411     1  0 18:28 ?        00:00:00 redis-sentinel *:26379 [sentinel]      
    root      2417     1  0 18:28 ?        00:00:00 redis-sentinel *:26380 [sentinel]      
    root      2422     1  0 18:28 ?        00:00:00 redis-sentinel *:26381 [sentinel]      
    root      2427  2253  0 18:28 pts/1    00:00:00 grep redis

4.2检查sentinel运行状态

[root@redis conf]# redis-cli -p 26379 info sentinel
    # Sentinel
    sentinel_masters:1
    sentinel_tilt:0
    sentinel_running_scripts:0
    sentinel_scripts_queue_length:0
    sentinel_simulate_failure_flags:0
    master0:name=mymaster,status=ok,address=127.0.0.1:6379,slaves=2,sentinels=3
    
    [root@redis conf]# redis-cli -p 26380 info sentinel  
    # Sentinel
    sentinel_masters:1
    sentinel_tilt:0
    sentinel_running_scripts:0
    sentinel_scripts_queue_length:0
    sentinel_simulate_failure_flags:0
    master0:name=mymaster,status=ok,address=127.0.0.1:6379,slaves=2,sentinels=3
    
    [root@redis conf]# redis-cli -p 26381 info sentinel 
    # Sentinel
    sentinel_masters:1
    sentinel_tilt:0
    sentinel_running_scripts:0
    sentinel_scripts_queue_length:0
    sentinel_simulate_failure_flags:0
    master0:name=mymaster,status=ok,address=127.0.0.1:6379,slaves=2,sentinels=3

**5.关闭redis主库，测试sentinel是否自动切换**

[root@redis conf]# redis-cli -p 6379 shutdown
    [root@redis conf]# ps -ef|grep redis
    root      2364     1  0 18:18 ?        00:00:02 redis-server *:6380                            
    root      2371     1  0 18:18 ?        00:00:02 redis-server *:6381                            
    root      2411     1  0 18:28 ?        00:00:01 redis-sentinel *:26379 [sentinel]      
    root      2417     1  0 18:28 ?        00:00:01 redis-sentinel *:26380 [sentinel]      
    root      2422     1  0 18:28 ?        00:00:01 redis-sentinel *:26381 [sentinel]      
    root      2457  2253  0 18:31 pts/1    00:00:00 grep redis

6379端口的主库已经关闭，检查其余实例和sentinel运行状态：

[root@redis conf]# redis-cli -p 6380 info replication  
    # Replication
    role:slave
    master_host:127.0.0.1
    master_port:6381
    master_link_status:up
    master_last_io_seconds_ago:0
    master_sync_in_progress:0
    slave_repl_offset:51111
    slave_priority:100
    slave_read_only:1
    connected_slaves:0
    master_replid:a88667e379874e6bb0ea07790c82101c3126cbcb
    master_replid2:0258297c0e6120287ec943ce7fbd580e0e9435b4
    master_repl_offset:51111
    second_repl_offset:39434
    repl_backlog_active:1
    repl_backlog_size:1048576
    repl_backlog_first_byte_offset:1
    repl_backlog_histlen:51111
    
    [root@redis conf]# redis-cli -p 6381 info replication 
    # Replication
    role:master
    connected_slaves:1
    slave0:ip=127.0.0.1,port=6380,state=online,offset=52042,lag=0
    master_replid:a88667e379874e6bb0ea07790c82101c3126cbcb
    master_replid2:0258297c0e6120287ec943ce7fbd580e0e9435b4
    master_repl_offset:52042
    second_repl_offset:39434
    repl_backlog_active:1
    repl_backlog_size:1048576
    repl_backlog_first_byte_offset:1
    repl_backlog_histlen:52042
    
    [root@redis conf]# redis-cli -p 26379 info sentinel
    # Sentinel
    sentinel_masters:1
    sentinel_tilt:0
    sentinel_running_scripts:0
    sentinel_scripts_queue_length:0
    sentinel_simulate_failure_flags:0
    master0:name=mymaster,status=ok,address=127.0.0.1:6381,slaves=2,sentinels=3

可以看到，6381成为了新的主库，6380成为了6381的从库。

至此，简单的redis sentinel架构搭建完毕。