1、拉取redis镜像
docker pull redis
2、启动3个redis容器服务，分别使用到6379、6380、6381端口
- docker run --name redis-6379 -p 6379:6379 -d redis
- docker run --name redis-6380 -p 6380:6379 -d redis
- docker run --name redis-6381 -p 6381:6379 -dredis
3、查看容器
- [tcy@tcy1 ~]$ docker ps -a
- CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES
- a9fa77adc598 daocloud.io/library/redis "docker-entrypoint.s 2 hours ago Up 2 hours 0.0.0.0:6381->6379/tcp redis-6381
- 6ee2f2f007e6 daocloud.io/library/redis "docker-entrypoint.s 2 hours ago Up 2 hours 0.0.0.0:6380->6379/tcp redis-6380
- ab54741166e1 daocloud.io/library/redis "docker-entrypoint.s 3 hours ago Up 3 hours 0.0.0.0:6379->6379/tcp redis-6379
4、测试容器，成功
- docker exec -it ab54741166e1 redis-cli：进入容器
- [root@tcy1 tcy]# docker exec -it ab54741166e1 redis-cli
- 127.0.0.1:6379> set b tcy
- OK
- 127.0.0.1:6379> get b
- "tcy"
- 127.0.0.1:6379> quit[root@tcy1 tcy]#
5、开始redis集群配置
5.1、看容器内网的ip地址
[root@tcy1 tcy]# docker inspect a9fa77adc598
3个redis的内网ip地址为：
- redis-6379：172.17.0.1:6379
- redis-6380：172.17.0.2:6379
- redis-6381：172.17.0.3:6379
5.2、进入docker容器内部，查看当前redis角色（主还是从）
- [root@tcy1 tcy]# docker exec -it ab54741166e1 /bin/bash
- root@ab54741166e1:/data# redis-cli
- 127.0.0.1:6379> info replication
- # Replication
- role:master
- connected_slaves:0
- master_replid:d43d1ae8cde6cb084220e18b926aba79e0bb2504
- master_replid2:0000000000000000000000000000000000000000
- master_repl_offset:0
- second_repl_offset:-1
- repl_backlog_active:0
- repl_backlog_size:1048576
- repl_backlog_first_byte_offset:0
- repl_backlog_histlen:0
- 127.0.0.1:6379> quit
- root@ab54741166e1:/data# exit
- exit
目前三个都是master状态
5.3、使用redis-cli命令修改redis-6380、redis-6381的主机为172.17.0.1:6379
- [root@tcy1 tcy]# docker exec -it a9fa77adc598 /bin/bash //redis-6380
- root@a9fa77adc598:/data# redis-cli
- 127.0.0.1:6379> SLAVEOF 172.17.0.1 6379
- OK
- 127.0.0.1:6379> quit
- root@a9fa77adc598:/data# exit
- exit
- [root@tcy1 tcy]# docker exec -it 6ee2f2f007e6 /bin/bash //redis-6381
- root@6ee2f2f007e6:/data# redis-cli
- 127.0.0.1:6379> SLAVEOF 172.17.0.1 6379
- OK
- 127.0.0.1:6379> quit
5.4、查看redis-6379是否已经拥有2个从机，connected_slaves:2，是的
- [root@tcy1 tcy]# docker exec -it ab54741166e1 /bin/bash
- root@ab54741166e1:/data# redis-cli
- 127.0.0.1:6379> info replication
- # Replication
- role:master
- connected_slaves:2
- slave0:ip=172.17.0.3,port=6379,state=online,offset=378,lag=1
- slave1:ip=172.17.0.2,port=6379,state=online,offset=378,lag=0
- master_replid:ce193b15cfd57f7dc3ccfbf2a4aef6156b131e6d
- master_replid2:0000000000000000000000000000000000000000
- master_repl_offset:378
- second_repl_offset:-1
- repl_backlog_active:1
- repl_backlog_size:1048576
- repl_backlog_first_byte_offset:1
- repl_backlog_histlen:378
- 127.0.0.1:6379> quit
- root@ab54741166e1:/data# exit
- exit
5.5、配置Sentinel哨兵
进入3台redis容器内部进行配置，在容器根目录里面创建sentinel.conf文件
文件内容为： sentinel monitor mymaster 172.17.0.1 6379 1
- [root@tcy1 tcy]# docker exec -it a9fa77adc598 /bin/bash
- root@a9fa77adc598:/data# cd / && touch sentinel.conf
- root@a9fa77adc598:/# vim /sentinel.conf
如果出现：bash: vim: command not found
解决：1、apt-get update 2、apt-get install vim
最后，启动Redis哨兵：
- root@a9fa77adc598:/# redis-sentinel /sentinel.conf
- 342:X 24 Jun 11:37:58.934 # oO0OoO0OoO0Oo Redis is starting oO0OoO0OoO0Oo
- 342:X 24 Jun 11:37:58.957 # Redis version=4.0.10, bits=64, commit=00000000, modified=0, pid=342, just started
- 342:X 24 Jun 11:37:58.958 # Configuration loaded
- 342:X 24 Jun 11:37:58.959 # You requested maxclients of 10000 requiring at least 10032 max file descriptors.
- 342:X 24 Jun 11:37:58.959 # Server can't set maximum open files to 10032 because of OS error: Operation not permitted.
- 342:X 24 Jun 11:37:58.960 # Current maximum open files is 4096. maxclients has been reduced to 4064 to compensate for low ulimit. If you need higher maxclients increase 'ulimit -n'.
- _._
- _.-``__ ''-._
- _.-`` `. `_. ''-._ Redis 4.0.10 (00000000/0) 64 bit
- .-`` .-```. ```\/ _.,_ ''-._
- ( ' , .-` | `, ) Running in sentinel mode
- |`-._`-...-` __...-.``-._|'` _.-'| Port: 26379
- | `-._ `._ / _.-' | PID: 342
- `-._ `-._ `-./ _.-' _.-'
- |`-._`-._ `-.__.-' _.-'_.-'|
- | `-._`-._ _.-'_.-' | http://redis.io
- `-._ `-._`-.__.-'_.-' _.-'
- |`-._`-._ `-.__.-' _.-'_.-'|
- | `-._`-._ _.-'_.-' |
- `-._ `-._`-.__.-'_.-' _.-'
- `-._ `-.__.-' _.-'
- `-._ _.-'
- `-.__.-'
-
- 342:X 24 Jun 11:37:59.068 # WARNING: The TCP backlog setting of 511 cannot be enforced because /proc/sys/net/core/somaxconn is set to the lower value of 128.
- 342:X 24 Jun 11:37:59.089 # Sentinel ID is dfd5a5bfe1036b1df3395c4ba858329034fc5b7e
- 342:X 24 Jun 11:37:59.091 # +monitor master mymaster 172.17.0.1 6379 quorum 1
- 342:X 24 Jun 11:37:59.110 * +slave slave 172.17.0.3:6379 172.17.0.3 6379 @ mymaster 172.17.0.1 6379
- 342:X 24 Jun 11:37:59.115 * +slave slave 172.17.0.2:6379 172.17.0.2 6379 @ mymaster 172.17.0.1 6379
-
- 342:X 24 Jun 11:39:27.601 * +sentinel sentinel ba9b0d0539d8273edfcbd922fe138f50daa78bbb 172.17.0.2 26379 @ mymaster 172.17.0.1 6379
- 342:X 24 Jun 11:41:59.144 * +sentinel sentinel f0510f8582b72c056531f219397ed8826683e665 172.17.0.1 26379 @ mymaster 172.17.0.1 6379
便于观察，开多个窗口。
Sentinel哨兵配置完毕
5.6、测试
关闭Master
- [tcy@tcy1 ~]$ docker stop ab54741166e1
- ab54741166e1
这时，剩余的2个从机，会自动选举产生新的主机，这里选举172.17.0.2为主机。
查看172.17.0.2，变成了主机。
- [root@tcy1 /]# docker exec -it 6ee2f2f007e6 /bin/bash
- root@6ee2f2f007e6:/data# redis-cli
- 127.0.0.1:6379> info replication
- # Replication
- role:master
- connected_slaves:1
- slave0:ip=172.17.0.3,port=6379,state=online,offset=66906,lag=1
- master_replid:5a7489c8181ddf0d73d418d30d6a4c8e039198ba
- master_replid2:ce193b15cfd57f7dc3ccfbf2a4aef6156b131e6d
- master_repl_offset:67041
- second_repl_offset:65534
- repl_backlog_active:1
- repl_backlog_size:1048576
- repl_backlog_first_byte_offset:85
- repl_backlog_histlen:66957
- 127.0.0.1:6379>
总结
以上所述是小编给大家介绍的Docker下redis的主从配置，希望对大家有所帮助，如果大家有任何疑问欢迎给我留言，小编会及时回复大家的！
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