docker搭建redis主从哨兵集群的实现步骤
本文以docker-compose 搭建高可用Redis 主从、哨兵集群为例子
关于redis主从，哨兵集群原理参见：Redis 单机安装/ 哨兵模式集群安装
1：获取redis镜像
docker pull redis:6.2.7
2：创建redis主从+哨兵docker-compose文件
cd /opt/docker/redis vi docker-compose.yml
docker-compose.yml的内容如下
version: '3'
services:
master:
image: redis:6.2.7 ## 镜像
container_name: redis-master
command: redis-server /etc/redis/redis.conf --requirepass 123456 --masterauth 123456
volumes:
- /opt/docker/redis/data/redis_data1:/data
- /opt/docker/redis/conf/redis1.conf:/etc/redis/redis.conf
network_mode: "host"
slave1:
image: redis:6.2.7 ## 镜像
container_name: redis-slave-1
volumes:
- /opt/docker/redis/data/redis_data2:/data
- /opt/docker/redis/conf/redis2.conf:/etc/redis/redis.conf
command: redis-server /etc/redis/redis.conf --slaveof redis-master 6379 --requirepass 123456 --masterauth 123456
depends_on:
- master
network_mode: "host"
slave2:
image: redis:6.2.7 ## 镜像
container_name: redis-slave-2
volumes:
- /opt/docker/redis/data/redis_data3:/data
- /opt/docker/redis/conf/redis3.conf:/etc/redis/redis.conf
command: redis-server /etc/redis/redis.conf --slaveof redis-master 6379 --requirepass 123456 --masterauth 123456
depends_on:
- master
network_mode: "host"
sentinel1:
image: redis:6.2.7 ## 镜像
container_name: redis-sentinel-1
command: redis-sentinel /usr/local/etc/redis/sentinel.conf
volumes:
- /opt/docker/redis/conf/sentinel1.conf:/usr/local/etc/redis/sentinel.conf
network_mode: "host"
depends_on:
- master
- slave1
- slave2
sentinel2:
image: redis:6.2.7 ## 镜像
container_name: redis-sentinel-2
command: redis-sentinel /usr/local/etc/redis/sentinel.conf
volumes:
- /opt/docker/redis/conf/sentinel2.conf:/usr/local/etc/redis/sentinel.conf
network_mode: "host"
depends_on:
- master
- slave1
- slave2
sentinel3:
image: redis:6.2.7 ## 镜像
container_name: redis-sentinel-3
command: redis-sentinel /usr/local/etc/redis/sentinel.conf
volumes:
- /opt/docker/redis/conf/sentinel3.conf:/usr/local/etc/redis/sentinel.conf
network_mode: "host"
depends_on:
- master
- slave1
- slave23：redis配置和哨兵配置说明
查看配置文件的目录树
cd /opt/docker/redis tree ./
结构如下
redis1.conf，redis2.conf，redis3.conf配置如下
#redis1.conf bind 0.0.0.0 port 6379 protected-mode no slave-read-only no #redis2.conf bind 0.0.0.0 port 6380 protected-mode no slave-read-only no #redis3.conf bind 0.0.0.0 port 6381 protected-mode no slave-read-only no
sentinel1.conf，sentinel1.conf，sentinel1.conf配置：
#sentinel1.conf port 26379 dir /tmp sentinel monitor mymaster 192.168.18.131 6379 2 sentinel auth-pass mymaster 123456 sentinel down-after-milliseconds mymaster 30000 sentinel parallel-syncs mymaster 1 sentinel failover-timeout mymaster 10000 sentinel deny-scripts-reconfig yes #sentinel2.conf port 26380 dir /tmp sentinel monitor mymaster 192.168.18.131 6379 2 sentinel auth-pass mymaster 123456 sentinel down-after-milliseconds mymaster 30000 sentinel parallel-syncs mymaster 1 sentinel failover-timeout mymaster 10000 sentinel deny-scripts-reconfig yes #sentinel3.conf port 26381 dir /tmp sentinel monitor mymaster 192.168.18.131 6379 2 sentinel auth-pass mymaster 123456 sentinel down-after-milliseconds mymaster 30000 sentinel parallel-syncs mymaster 1 sentinel failover-timeout mymaster 10000 sentinel deny-scripts-reconfig yes
说明：
【sentinel monitor mymaster 192.168.18.131 6379 2】192.168.18.131为主机的IP地址，6379为redis master的端口号
【sentinel auth-pass mymaster 123456】设置主节点的密码
【sentinel down-after-milliseconds mymaster 30000】表示在一段时间范围内sentinel向master发送的心跳PING没有回复则认为master不可用了。
【sentinel parallel-syncs mymaster 1】的parallel-syncs表示设置在故障转移之后，同时可以重新配置使用新master的slave的数量。数字越低，更多的时间将会用故障转移完成，但是如果slaves配置为服务旧数据，你可能不希望所有的slave同时重新同步master。因为主从复制对于slave是非阻塞的，当停止从master加载批量数据时有一个片刻延迟。通过设置选项为1，确信每次只有一个slave是不可到达的。
【sentinel failover-timeout mymaster 10000 】表示10秒内mymaster还没活过来，则认为master宕机了。
redis_data1,redis_data2,redis_data3为空文件夹，用于存放redis数据文件
4：启动docker-compose
docker-compose up #或者，后台启动 docker-compose up -d
5：查看启动情况
6：进入主节点查看集群情况
docker exec -it 主节点容器id或者容器名称 bash redis-cli -p 6379 info replication
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