Docker下redis的主從配置教程詳解
阿新 • • 發佈:2020-01-09
1、拉取redis映象
docker pull redis
2、啟動3個redis容器服務,分別使用到6379、6380、6381埠
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、檢視容器
[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、測試容器,成功
docker exec -it ab54741166e1 redis-cli:進入容器 [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、開始redis叢集配置
5.1、看容器內網的ip地址
[root@tcy1 tcy]# docker inspect a9fa77adc598
3個redis的內網ip地址為:
redis-6379:172.17.0.1:6379 redis-6380:172.17.0.2:6379 redis-6381:172.17.0.3:6379
5.2、進入docker容器內部,檢視當前redis角色(主還是從)
[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
目前三個都是master狀態
5.3、使用redis-cli命令修改redis-6380、redis-6381的主機為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、檢視redis-6379是否已經擁有2個從機,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,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
進入3臺redis容器內部進行配置,在容器根目錄裡面建立sentinel.conf檔案
檔案內容為: 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
如果出現:bash: vim: command not found
解決:1、apt-get update 2、apt-get install vim
最後,啟動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
便於觀察,開多個視窗。
Sentinel哨兵配置完畢
5.6、測試
關閉Master
[tcy@tcy1 ~]$ docker stop ab54741166e1 ab54741166e1
這時,剩餘的2個從機,會自動選舉產生新的主機,這裡選舉172.17.0.2為主機。
檢視172.17.0.2,變成了主機。
[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,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>
總結
以上所述是小編給大家介紹的Docker下redis的主從配置,希望對大家有所幫助,如果大家有任何疑問歡迎給我留言,小編會及時回覆大家的!