How to implement Redis cluster installation and configuration under Docker

1. Pull the mirrors from all machines

docker pull redis

2. Build the master-slave cluster

2.1. redis.cong file

2.1.1. Master node:

bind  0.0.0.0
protected-mode no
//redis配置访问密码
requirepass 123456
//主节点密码  哨兵模式下主节点宕机从新恢复变成从节点  需要密码
masterauth 123456

2.1.2. Slave node:

bind  0.0.0.0
protected-mode no
requirepass 123456
//主节点访问密码
masterauth 123456
//主节点信息
slaveof  *.*.*.* 6379

2.2. Create a local mapping folder and put redis.conf in /usr/local/redis/ conf folder

# /usr/local/redis
cd /usr/locar/redis
mkdir conf
mkdir data

2.3. Start redis

docker run -p 6379:6379 --name redis \
-v /usr/local/redis/conf/redis.conf:/etc/redis/redis.conf \
-v /usr/local/redis/data:/data \
-d redis redis-server /etc/redis/redis.conf --appendonly yes

2.4. Verify whether the redis master-slave cluster installation is successful

### 在主节点查看
# 进入容器内部
docker exec -it redis bash
 
# 进入redis
redis-cli
 
# 校验密码
auth 123456
 
# 查看集群信息
info replication

3. Turn on sentinel mode

3.1. Sentinel.conf configuration file

#### 根据需要修改一下内容 
# 让sentinel服务后台运行(docker的话需要设置为no，非docker运行设置为yes, 因为docker有个-d属性就是让在后台运行的)
daemonize no 
 
# 修改日志文件的路径
logfile "/data/sentinel.log"
 
# 修改监控的主redis服务器
# 最后一个2表示，两台机器判定主被动下线后，就进行failover(故障转移)
sentinel monitor mymaster *.*.*.*(公网ip) 6390 2
 
#超过5秒master还没有连接上，则认为master已经停止
sentinel down-after-milliseconds mymaster 5000
 
 
sentinel auth-pass mymaster 123456

3.2. Create a local mapping folder, And put sentinel.conf in the /usr/local/redis-sentinel/conf folder

# /usr/local/redis
cd /usr/locar/redis-sentinel
mkdir conf
mkdir data

3.3. Start the redis-sentinel process

docker run -d --name sentinel -p 26379:26379  \
-v /usr/local/redis-sentinel/conf/sentinel.conf:/etc/sentinel.conf \
-v /usr/local/redis-sentinel/data:/data redis redis-sentinel /etc/sentinel.conf

3.4. Enter the redis-sentinel container to view

# 进入sentinel节点
docker exec -it sentinel redis-cli  -p 26379
# 查看sentinel信息
info sentinel

3.5. Service test

• Close the master node

• Execute multiple times "info replication" command to observe the changes in information after executing the 2.4 verification module built by the master-slave cluster

• or monitor the log file of the sentinel configuration, you can see its occurrence in real time The change

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