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3主3从redis集群扩缩容配置案例说明

[[toc]]

[toc]

关闭防火墙+启动docker后台服务

systemctl strt docker

新建6个docker实例

大规模的扩缩容，如何快速同时启动，docker提供了瞬间可达

docker run -d --name redis-node-1 --net host --privileged=true \
-v /data/redis/share/redis-node-1:/data \
redis:6.0.8 --cluster-enabled yes --appendonly yes --port 6381

docker run -d --name redis-node-2 --net host --privileged=true \
-v /data/redis/share/redis-node-2:/data \
redis:6.0.8 --cluster-enabled yes --appendonly yes --port 6382

docker run -d --name redis-node-3 --net host --privileged=true \
-v /data/redis/share/redis-node-3:/data \
redis:6.0.8 --cluster-enabled yes --appendonly yes --port 6383

docker run -d --name redis-node-4 --net host --privileged=true \
-v /data/redis/share/redis-node-4:/data \
redis:6.0.8 --cluster-enabled yes --appendonly yes --port 6384

docker run -d --name redis-node-5 --net host --privileged=true \
-v /data/redis/share/redis-node-5:/data \
redis:6.0.8 --cluster-enabled yes --appendonly yes --port 6385

docker run -d --name redis-node-6 --net host --privileged=true \
-v /data/redis/share/redis-node-6:/data \
redis:6.0.8 --cluster-enabled yes --appendonly yes --port 6386

docker ps

image-20220512164801906

进入容器redis-node-1并为6台机器构建集群关系

docker exec -it redis-node-1 /bin/bash

ifconfig #查看ip	192.168.121.129

redis-cli --cluster create 192.168.121.129:6381 192.168.121.129:6382 192.168.121.129:6383 192.168.121.129:6384 192.168.121.129:6385 192.168.121.129:6386 --cluster-replicas 1
# --cluster-replicas 1表示为每一个master创建一个slave结点

image-20220512165806124

  • Performing hash slots allocation on 6 nodes...哈希槽对六个结点进行分配

  • M：表示主机器（master主人）

  • S：表示从机器 （slaves奴隶）

  • yes接受分配~分配成功

    image-20220512170053023

​

以6381作为切入点，查看集群状态

redis-cli -p 6381
cluster info
  • cluster info查看槽位
root@ubuntu:/data# redis-cli -p 6381
127.0.0.1:6381> cluster info
cluster_state: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:415
cluster_stats_messages_pong_sent:422
cluster_stats_messages_sent:837
cluster_stats_messages_ping_received:417
cluster_stats_messages_pong_received:415
cluster_stats_messages_meet_received:5
cluster_stats_messages_received:837
127.0.0.1:6381> cluster nodes
964043841e4c5519d3cde93cae6b32ebe5ba1830 192.168.121.129:6381@16381 myself,master - 0 1652346428000 1 connected 0-5460
702a95b6eeb02a9d01d38152d599fdf57c70cf0c 192.168.121.129:6386@16386 slave 447dba4f4813f9178d67e62488a4c4c5aba87635 0 1652346430721 3 connected
125e88db573553be475175cd604eb9887506a121 192.168.121.129:6385@16385 slave cc788412e2b72c5a3ea3ba5cd9c80197a554382f 0 1652346429000 2 connected
cc788412e2b72c5a3ea3ba5cd9c80197a554382f 192.168.121.129:6382@16382 master - 0 1652346430000 2 connected 5461-10922
187c17cec8177135b6203328156bb7a7e73714d0 192.168.121.129:6384@16384 slave 964043841e4c5519d3cde93cae6b32ebe5ba1830 0 1652346429715 1 connected
447dba4f4813f9178d67e62488a4c4c5aba87635 192.168.121.129:6383@16383 master - 0 1652346428707 3 connected 10923-16383
127.0.0.1:6381>

1,2,3三台机器是master；4，5，6三台机器是slave

1号主机挂4号，2号主机挂5号，3号挂6号，这个是随机分配的（为什么我的这莫巧我也不知道）

主从容错切换迁移案例

127.0.0.1:6381> set k1 vi
(error) MOVED 12706 192.168.121.129:6383
127.0.0.1:6381> set k1 v1
(error) MOVED 12706 192.168.121.129:6383
127.0.0.1:6381> set k2 v2
OK
127.0.0.1:6381> set k3 v3
OK
127.0.0.1:6381> set k4 v4
(error) MOVED 8455 192.168.121.129:6382
127.0.0.1:6381> set k5 v5
(error) MOVED 12582 192.168.121.129:6383
127.0.0.1:6381> set k6 v6
OK

在集群中这样用的话会失效，不能用单机版连接命令

防止路由失效加参数-c并新增两个key

redis-cli -p 6381 -c

演示

root@ubuntu:/data# redis-cli -p 8381 -c
Could not connect to Redis at 127.0.0.1:8381: Connection refused
not connected> exit
root@ubuntu:/data# redis-cli -p 6381 -c
127.0.0.1:6381> flushall
OK
127.0.0.1:6381> set k1 v1
-> Redirected to slot [12706] located at 192.168.121.129:6383
OK
192.168.121.129:6383> set k2 v2
-> Redirected to slot [449] located at 192.168.121.129:6381
OK
192.168.121.129:6381> set k3 v3
OK
192.168.121.129:6381> set k4 v4
-> Redirected to slot [8455] located at 192.168.121.129:6382
OK
192.168.121.129:6382> set k5 v5
-> Redirected to slot [12582] located at 192.168.121.129:6383
OK
192.168.121.129:6383> set k6 v6
-> Redirected to slot [325] located at 192.168.121.129:6381
OK

即5号和6号slave不是在1号机，越界了，可以用-c集群化。会跳转到对应的redis

查看集群信息cluster check

redis-cli --cluster check 192.168.121.129:6381

将第一台机器停掉

docker stop redis-node-1

image-20220512180313934

此时1号宕机了，我们从二号开始作为突破

我们查看集群状态

127.0.0.1:6382> cluster nodes
187c17cec8177135b6203328156bb7a7e73714d0 192.168.121.129:6384@16384 master - 0 1652349890155 7 connected 0-5460
125e88db573553be475175cd604eb9887506a121 192.168.121.129:6385@16385 slave cc788412e2b72c5a3ea3ba5cd9c80197a554382f 0 1652349891169 2 connected
cc788412e2b72c5a3ea3ba5cd9c80197a554382f 192.168.121.129:6382@16382 myself,master - 0 1652349890000 2 connected 5461-10922
702a95b6eeb02a9d01d38152d599fdf57c70cf0c 192.168.121.129:6386@16386 slave 447dba4f4813f9178d67e62488a4c4c5aba87635 0 1652349892186 3 connected
447dba4f4813f9178d67e62488a4c4c5aba87635 192.168.121.129:6383@16383 master - 0 1652349889000 3 connected 10923-16383
964043841e4c5519d3cde93cae6b32ebe5ba1830 192.168.121.129:6381@16381 master,fail - 1652349736906 1652349733000 1 disconnected

结点1还活着,但是显示得是fail，此时6384上位，显示master，完成了集群迁移

我们将6381恢复过来，再看看集群信息

root@ubuntu:/mysql/mydata/mysql-slave/conf# docker start redis-node-1
redis-node-1
root@ubuntu:/mysql/mydata/mysql-slave/conf# docker ps |grep redis
3b80844ec9cd   redis:6.0.8             "docker-entrypoint.s…"   About an hour ago   Up About an hour                                                                      redis-node-6
1ed04c474cbf   redis:6.0.8             "docker-entrypoint.s…"   About an hour ago   Up About an hour                                                                      redis-node-5
fa6e8cac6376   redis:6.0.8             "docker-entrypoint.s…"   About an hour ago   Up About an hour                                                                      redis-node-4
de3446725228   redis:6.0.8             "docker-entrypoint.s…"   About an hour ago   Up About an hour                                                                      redis-node-3
c6cdf1fbc619   redis:6.0.8             "docker-entrypoint.s…"   About an hour ago   Up About an hour                                                                      redis-node-2
b6924b43bca4   redis:6.0.8             "docker-entrypoint.s…"   About an hour ago   Up 8 seconds                                                                          redis-node-1

此时已经恢复过来了，我们查看节点状态

root@ubuntu:/data# redis-cli -p 6381 -c
127.0.0.1:6381> cluster nodes
125e88db573553be475175cd604eb9887506a121 192.168.121.129:6385@16385 slave cc788412e2b72c5a3ea3ba5cd9c80197a554382f 0 1652350295591 2 connected
187c17cec8177135b6203328156bb7a7e73714d0 192.168.121.129:6384@16384 master - 0 1652350294577 7 connected 0-5460
964043841e4c5519d3cde93cae6b32ebe5ba1830 192.168.121.129:6381@16381 myself,slave 187c17cec8177135b6203328156bb7a7e73714d0 0 1652350293000 7 connected
cc788412e2b72c5a3ea3ba5cd9c80197a554382f 192.168.121.129:6382@16382 master - 0 1652350293000 2 connected 5461-10922
447dba4f4813f9178d67e62488a4c4c5aba87635 192.168.121.129:6383@16383 master - 0 1652350292548 3 connected 10923-16383
702a95b6eeb02a9d01d38152d599fdf57c70cf0c 192.168.121.129:6386@16386 slave 447dba4f4813f9178d67e62488a4c4c5aba87635 0 1652350296602 3 connected

可见1号机器虽然活过来了，但是成为从结点，奴隶结点了

如果我们再把4号机停掉，给1号机器上位得机会，此时6381得1好机器依旧能回到主结点