Docker下redis的主从配置教程详解

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 redisdocker run --name redis-6380 -p 6380:6379 -d redisdocker run --name redis-6381 -p 6381:6379 -dredis

3、查看容器

[tcy@tcy1 ~]$ docker ps -aCONTAINER ID  IMAGE      COMMAND    CREATED    STATUS    PORTS     NAMESa9fa77adc598  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-cli127.0.0.1:6379> set b tcyOK127.0.0.1:6379> 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-6379：172.17.0.1:6379redis-6380：172.17.0.2:6379redis-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/bashroot@ab54741166e1:/data# redis-cli127.0.0.1:6379> info replication# Replicationrole:masterconnected_slaves:0master_replid:d43d1ae8cde6cb084220e18b926aba79e0bb2504master_replid2:0000000000000000000000000000000000000000master_repl_offset:0second_repl_offset:-1repl_backlog_active:0repl_backlog_size:1048576repl_backlog_first_byte_offset:0repl_backlog_histlen:0127.0.0.1:6379> quitroot@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-6380root@a9fa77adc598:/data# redis-cli127.0.0.1:6379> SLAVEOF 172.17.0.1 6379OK127.0.0.1:6379> quitroot@a9fa77adc598:/data# exitexit[root@tcy1 tcy]# docker exec -it 6ee2f2f007e6 /bin/bash //redis-6381root@6ee2f2f007e6:/data# redis-cli127.0.0.1:6379> SLAVEOF 172.17.0.1 6379OK127.0.0.1:6379> 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/bashroot@ab54741166e1:/data# redis-cli127.0.0.1:6379> info replication# Replicationrole:masterconnected_slaves:2slave0:ip=172.17.0.3,port=6379,state=online,offset=378,lag=1slave1:ip=172.17.0.2,port=6379,state=online,offset=378,lag=0master_replid:ce193b15cfd57f7dc3ccfbf2a4aef6156b131e6dmaster_replid2:0000000000000000000000000000000000000000master_repl_offset:378second_repl_offset:-1repl_backlog_active:1repl_backlog_size:1048576repl_backlog_first_byte_offset:1repl_backlog_histlen:378127.0.0.1:6379> quitroot@ab54741166e1:/data# exitexit

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/bashroot@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.conf342:X 24 Jun 11:37:58.934 # oO0OoO0OoO0Oo Redis is starting oO0OoO0OoO0Oo342:X 24 Jun 11:37:58.957 # Redis version=4.0.10, bits=64, commit=00000000, modified=0, pid=342, just started342:X 24 Jun 11:37:58.958 # Configuration loaded342: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 dfd5a5bfe1036b1df3395c4ba858329034fc5b7e342:X 24 Jun 11:37:59.091 # +monitor master mymaster 172.17.0.1 6379 quorum 1342:X 24 Jun 11:37:59.110 * +slave slave 172.17.0.3:6379 172.17.0.3 6379 @ mymaster 172.17.0.1 6379342: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 6379342: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 ab54741166e1ab54741166e1

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/bashroot@6ee2f2f007e6:/data# redis-cli127.0.0.1:6379> info replication# Replicationrole:masterconnected_slaves:1slave0:ip=172.17.0.3,port=6379,state=online,offset=66906,lag=1master_replid:5a7489c8181ddf0d73d418d30d6a4c8e039198bamaster_replid2:ce193b15cfd57f7dc3ccfbf2a4aef6156b131e6dmaster_repl_offset:67041second_repl_offset:65534repl_backlog_active:1repl_backlog_size:1048576repl_backlog_first_byte_offset:85repl_backlog_histlen:66957127.0.0.1:6379> 

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！