前言

 在现实生产环境中我们可能会遇到一种情况，那就是系统需要从一个网段迁移到另一个网段。但是由于redis集群在创建时配置文件中是指定了每个节点的IP地址及端口的，因此在redis节点IP更换后，原有的集群也就失效了。如果要恢复原有的集群应该怎么办？如果不考虑集群数据的话，我们可以直接选择删除所有redis节点的数据文件dbfilename、持久化文件appendfilename、集群配置文件cluster-config-file，然后重建集群即可。但是大部分情况下我们是需要保留redis集群数据的，那么我们又该怎么来操作呢？下面演示下

修改node-1的redis节点配置文件redis.conf中的节点IP（或者修改整个redis集群IP网段）

[root@es-node22 ~]# cat /root/redis/node-1/conf/redis.conf
port 6379
bind 0.0.0.0
cluster-enabled yes
cluster-config-file nodes.conf   ---》指定redis集群节点配置文件
cluster-node-timeout 5000
cluster-announce-ip 192.168.3.11   ---》可以看到node-1节点配置文件中IP已经修改了
cluster-announce-port 6379
cluster-announce-bus-port 16379
appendonly yes

查看集群状态

127.0.0.1:6379> set name tom        ---》测试在redis集群中存数据时报错
-> Redirected to slot [5798] located at 192.168.3.2:6379
(error) CLUSTERDOWN The cluster is down

192.168.3.2:6379> cluster info
cluster_state:fail       ---》显示集群状态已关闭
cluster_slots_assigned:16384
cluster_slots_ok:10923
cluster_slots_pfail:0
cluster_slots_fail:5461
cluster_known_nodes:6
cluster_size:3
cluster_current_epoch:6
cluster_my_epoch:2
cluster_stats_messages_ping_sent:2203
cluster_stats_messages_pong_sent:392
cluster_stats_messages_meet_sent:4
cluster_stats_messages_fail_sent:4
cluster_stats_messages_sent:2603
cluster_stats_messages_ping_received:391
cluster_stats_messages_pong_received:310
cluster_stats_messages_meet_received:1
cluster_stats_messages_fail_received:1
cluster_stats_messages_received:703

192.168.3.2:6379> cluster slots    ---》当前的集群状态，以数组形式展示
1) 1) (integer) 10923
   2) (integer) 16383
   3) 1) "192.168.3.3"
      2) (integer) 6379
      3) "ff0d1d636f94d9b092e6012408c1d0918e00e6ed"
   4) 1) "192.168.3.4"
      2) (integer) 6379
      3) "2113cf366ad27ebd73585f03d368e77f03b1a2e1"
2) 1) (integer) 0
   2) (integer) 5460
   3) 1) "192.168.3.1"           ---》可以看到集群中该节点的IP还是原来的IP
      2) (integer) 6379
      3) "c856c94ba8d2c55a0d176831bc85aa34a96fde88"
   4) 1) "192.168.3.5"
      2) (integer) 6379
      3) "d92ff5984ab29370af0adeaca71e7938c0287ca5"
3) 1) (integer) 5461
   2) (integer) 10922
   3) 1) "192.168.3.2"
      2) (integer) 6379
      3) "8b01b1bc6202e1dc7ff9f15013d8200b10ecb3f3"
   4) 1) "192.168.3.6"
      2) (integer) 6379
      3) "2108a90495c147c675328f9b8b4fa49e2b856faf"

解决

 查看redis集群节点配置文件nodes.conf

[root@es-node22 ~]# cat /root/redis/node-1/data/nodes.conf
c856c94ba8d2c55a0d176831bc85aa34a96fde88 192.168.3.1:6379@16379 myself,master - 0 1653743266000 1 connected 0-5460
d92ff5984ab29370af0adeaca71e7938c0287ca5 192.168.3.5:6379@16379 slave c856c94ba8d2c55a0d176831bc85aa34a96fde88 0 1653743274000 5 connected
2108a90495c147c675328f9b8b4fa49e2b856faf 192.168.3.6:6379@16379 slave 8b01b1bc6202e1dc7ff9f15013d8200b10ecb3f3 0 1653743275531 6 connected
2113cf366ad27ebd73585f03d368e77f03b1a2e1 192.168.3.4:6379@16379 slave ff0d1d636f94d9b092e6012408c1d0918e00e6ed 0 1653743275531 4 connected
8b01b1bc6202e1dc7ff9f15013d8200b10ecb3f3 192.168.3.2:6379@16379 master - 0 1653743275531 2 connected 5461-10922
ff0d1d636f94d9b092e6012408c1d0918e00e6ed 192.168.3.3:6379@16379 master - 0 1653743275000 3 connected 10923-16383
vars currentEpoch 6 lastVoteEpoch 0

[root@es-node22 ~]# cat /root/redis/node-2/data/nodes.conf
ff0d1d636f94d9b092e6012408c1d0918e00e6ed 192.168.3.3:6379@16379 master - 0 1653743273233 3 connected 10923-16383
2113cf366ad27ebd73585f03d368e77f03b1a2e1 192.168.3.4:6379@16379 slave ff0d1d636f94d9b092e6012408c1d0918e00e6ed 0 1653743271151 4 connected
c856c94ba8d2c55a0d176831bc85aa34a96fde88 192.168.3.1:6379@16379 master,fail - 1653743267074 1653743266961 1 connected 0-5460
d92ff5984ab29370af0adeaca71e7938c0287ca5 192.168.3.5:6379@16379 slave c856c94ba8d2c55a0d176831bc85aa34a96fde88 0 1653743272000 1 connected
8b01b1bc6202e1dc7ff9f15013d8200b10ecb3f3 192.168.3.2:6379@16379 myself,master - 0 1653743271000 2 connected 5461-10922
2108a90495c147c675328f9b8b4fa49e2b856faf 192.168.3.6:6379@16379 slave 8b01b1bc6202e1dc7ff9f15013d8200b10ecb3f3 0 1653743272194 6 connected
vars currentEpoch 6 lastVoteEpoch 0

 可以看到redis所有节点的集群配置文件nodes.conf中还是192.168.3.1:6379，需要修改成我们更换后的IP地址。（如果只是单个redis更换IP，就只需要修改那一个redis的IP跟端口即可；如果是所有redis节点，就修改所有redis节点IP跟端口配置）

 批量修改所有redis节点nodes.conf文件中该配置

[root@es-node22 ~]# for i in $(seq 1 6); do \
> sed -i 's/192.168.3.1/192.168.3.11/' /root/redis/node-${i}/data/nodes.conf
> done

 查看修改后的所有redis集群nodes.conf文件

[root@es-node22 ~]# cat /root/redis/node-1/data/nodes.conf                                                  
c856c94ba8d2c55a0d176831bc85aa34a96fde88 192.168.3.11:6379@16379 myself,master - 0 1653743266000 1 connected 0-5460
d92ff5984ab29370af0adeaca71e7938c0287ca5 192.168.3.5:6379@16379 slave c856c94ba8d2c55a0d176831bc85aa34a96fde88 0 1653743274000 5 connected
2108a90495c147c675328f9b8b4fa49e2b856faf 192.168.3.6:6379@16379 slave 8b01b1bc6202e1dc7ff9f15013d8200b10ecb3f3 0 1653743275531 6 connected
2113cf366ad27ebd73585f03d368e77f03b1a2e1 192.168.3.4:6379@16379 slave ff0d1d636f94d9b092e6012408c1d0918e00e6ed 0 1653743275531 4 connected
8b01b1bc6202e1dc7ff9f15013d8200b10ecb3f3 192.168.3.2:6379@16379 master - 0 1653743275531 2 connected 5461-10922
ff0d1d636f94d9b092e6012408c1d0918e00e6ed 192.168.3.3:6379@16379 master - 0 1653743275000 3 connected 10923-16383
vars currentEpoch 6 lastVoteEpoch 0

[root@es-node22 ~]# cat /root/redis/node-2/data/nodes.conf
ff0d1d636f94d9b092e6012408c1d0918e00e6ed 192.168.3.3:6379@16379 master - 0 1653743273233 3 connected 10923-16383
2113cf366ad27ebd73585f03d368e77f03b1a2e1 192.168.3.4:6379@16379 slave ff0d1d636f94d9b092e6012408c1d0918e00e6ed 0 1653743271151 4 connected
c856c94ba8d2c55a0d176831bc85aa34a96fde88 192.168.3.11:6379@16379 master,fail - 1653743267074 1653743266961 1 connected 0-5460
d92ff5984ab29370af0adeaca71e7938c0287ca5 192.168.3.5:6379@16379 slave c856c94ba8d2c55a0d176831bc85aa34a96fde88 0 1653743272000 1 connected
8b01b1bc6202e1dc7ff9f15013d8200b10ecb3f3 192.168.3.2:6379@16379 myself,master - 0 1653743271000 2 connected 5461-10922
2108a90495c147c675328f9b8b4fa49e2b856faf 192.168.3.6:6379@16379 slave 8b01b1bc6202e1dc7ff9f15013d8200b10ecb3f3 0 1653743272194 6 connected
vars currentEpoch 6 lastVoteEpoch 0
...
...

 批量重启redis集群所有节点容器

[root@es-node22 ~]# docker restart $(docker ps | grep redis | awk '{print $1}')
dcd802a160c6
6e2f628457f6
f05d3dfb9c8b
220df78836e9
31e7b232f1d1
1de91b4d4e68

[root@es-node22 ~]# docker ps
CONTAINER ID   IMAGE                    COMMAND                  CREATED       STATUS       PORTS                                                                                      NAMES
6e2f628457f6   redis:5.0.9-alpine3.11   "docker-entrypoint.s…"   3 hours ago   Up 2 hours   0.0.0.0:6376->6379/tcp, :::6376->6379/tcp, 0.0.0.0:16376->16379/tcp, :::16376->16379/tcp   redis-6
f05d3dfb9c8b   redis:5.0.9-alpine3.11   "docker-entrypoint.s…"   3 hours ago   Up 2 hours   0.0.0.0:6375->6379/tcp, :::6375->6379/tcp, 0.0.0.0:16375->16379/tcp, :::16375->16379/tcp   redis-5
220df78836e9   redis:5.0.9-alpine3.11   "docker-entrypoint.s…"   3 hours ago   Up 2 hours   0.0.0.0:6374->6379/tcp, :::6374->6379/tcp, 0.0.0.0:16374->16379/tcp, :::16374->16379/tcp   redis-4
31e7b232f1d1   redis:5.0.9-alpine3.11   "docker-entrypoint.s…"   3 hours ago   Up 2 hours   0.0.0.0:6373->6379/tcp, :::6373->6379/tcp, 0.0.0.0:16373->16379/tcp, :::16373->16379/tcp   redis-3
1de91b4d4e68   redis:5.0.9-alpine3.11   "docker-entrypoint.s…"   3 hours ago   Up 2 hours   0.0.0.0:6372->6379/tcp, :::6372->6379/tcp, 0.0.0.0:16372->16379/tcp, :::16372->16379/tcp   redis-2
dcd802a160c6   redis:5.0.9-alpine3.11   "docker-entrypoint.s…"   3 hours ago   Up 2 hours   0.0.0.0:6371->6379/tcp, :::6371->6379/tcp, 0.0.0.0:16371->16379/tcp, :::16371->16379/tcp   redis-1

 重新查看redis集群状态

[root@es-node22 ~]# docker exec -it redis-1 /bin/sh    ---》redis中默认没有bash解释器
/data # redis-cli -c
127.0.0.1:6379> cluster info
cluster_state:ok      ---》可以看到redis集群状态已经为OK
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:6
cluster_my_epoch:1
cluster_stats_messages_ping_sent:236
cluster_stats_messages_pong_sent:233
cluster_stats_messages_sent:469
cluster_stats_messages_ping_received:233
cluster_stats_messages_pong_received:232
cluster_stats_messages_received:465

127.0.0.1:6379> cluster nodes   
c856c94ba8d2c55a0d176831bc85aa34a96fde88 192.168.3.11:6379@16379 master - 0 1653752958838 1 connected 0-5460
8b01b1bc6202e1dc7ff9f15013d8200b10ecb3f3 192.168.3.2:6379@16379 myself,master - 0 1653752957000 2 connected 5461-10922
2113cf366ad27ebd73585f03d368e77f03b1a2e1 192.168.3.4:6379@16379 slave ff0d1d636f94d9b092e6012408c1d0918e00e6ed 0 1653752957804 4 connected
2108a90495c147c675328f9b8b4fa49e2b856faf 192.168.3.6:6379@16379 slave 8b01b1bc6202e1dc7ff9f15013d8200b10ecb3f3 0 1653752957086 6 connected
ff0d1d636f94d9b092e6012408c1d0918e00e6ed 192.168.3.3:6379@16379 master - 0 1653752958000 3 connected 10923-16383
d92ff5984ab29370af0adeaca71e7938c0287ca5 192.168.3.5:6379@16379 slave c856c94ba8d2c55a0d176831bc85aa34a96fde88 0 1653752958529 1 connected

127.0.0.1:6379> cluster slots
1) 1) (integer) 5461
   2) (integer) 10922
   3) 1) "192.168.3.2"
      2) (integer) 6379
      3) "8b01b1bc6202e1dc7ff9f15013d8200b10ecb3f3"
   4) 1) "192.168.3.6"
      2) (integer) 6379
      3) "2108a90495c147c675328f9b8b4fa49e2b856faf"
2) 1) (integer) 0
   2) (integer) 5460
   3) 1) "192.168.3.11"      ---》可以看到集群中该节点的IP已经为修改后的IP
      2) (integer) 6379
      3) "c856c94ba8d2c55a0d176831bc85aa34a96fde88"
   4) 1) "192.168.3.5"
      2) (integer) 6379
      3) "d92ff5984ab29370af0adeaca71e7938c0287ca5"
3) 1) (integer) 10923
   2) (integer) 16383
   3) 1) "192.168.3.3"
      2) (integer) 6379
      3) "ff0d1d636f94d9b092e6012408c1d0918e00e6ed"
   4) 1) "192.168.3.4"
      2) (integer) 6379
      3) "2113cf366ad27ebd73585f03d368e77f03b1a2e1"

总结

 在redis集群节点更换IP地址后，只需要修改所有redis节点集群配置cluster-config-file指定的配置文件中的IP地址为新更换的IP地址（网段），修改完成后批量重启所有redis节点后，redis集群即可自动恢复为OK状态。

【个人公众号】

  【微信公众号】搜索： 非著名运维 --》 公众号回复 “资料” 送运维自学资料大礼包哦！上面也会分享一些运维知识，大家点点发财手关注一波，感谢大家。

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