本文演示一主二从。
先说一下遇到的问题。我看网上说想配置哨兵，必须让启动redis的docker网络模式为host，否则无法访问到从还是什么的。我指定--network host后无法外网访问，redis desktop manager连不上redis了，后来发现我这个新克隆的机器没关防火墙，关上就好了。
1.配置主从
docker pull一下redis
master
mkdir -p /mydata/redis/6379/conf
mkdir -p /mydata/redis/6379/data
touch /mydata/redis/6379/conf/redis.conf
echo "appendonly yes" >> /mydata/redis/6379/conf/redis.conf
docker run --network host --name redis6379 -v /mydata/redis/6379/data:/data -v /mydata/redis/6379/conf/redis.conf:/etc/redis/redis.conf -d redis redis-server /etc/redis/redis.conf --port 6379
slave
#slave1
mkdir -p /mydata/redis/6380/conf
mkdir -p /mydata/redis/6380/data
touch /mydata/redis/6380/conf/redis.conf
echo "appendonly yes" >> /mydata/redis/6380/conf/redis.conf
docker run --network host --name redis6380 -v /mydata/redis/6380/data:/data -v /mydata/redis/6380/conf/redis.conf:/etc/redis/redis.conf -d redis redis-server /etc/redis/redis.conf --port 6380 --slaveof 192.168.243.4 6379
#slave2
mkdir -p /mydata/redis/6381/conf
mkdir -p /mydata/redis/6381/data
touch /mydata/redis/6381/conf/redis.conf
echo "appendonly yes" >> /mydata/redis/6381/conf/redis.conf
docker run --network host --name redis6381 -v /mydata/redis/6381/data:/data -v /mydata/redis/6381/conf/redis.conf:/etc/redis/redis.conf -d redis redis-server /etc/redis/redis.conf --port 6381 --slaveof 192.168.243.4 6379
查看配置：
#主
docker exec -it redis6379 redis-cli
>info replication
#从
docker exec -it redis6380 redis-cli -p 6380
>info replication
2. 配置哨兵
master
mkdir /mydata/redis/6379/sentinel
mkdir /mydata/redis/6379/sentinel/log
vi /mydata/redis/6379/sentinel/sentinel.conf
#输入
port 26379
dir "/var/log/sentinel"
logfile "/var/log/sentinel/26379.log"
sentinel monitor mymaster 192.168.243.4 6379 1 #这里暂时设置成1
#方便看一下主挂掉是什么效果
sentinel down-after-milliseconds mymaster 5000
sentinel parallel-syncs mymaster 1
sentinel failover-timeout mymaster 180000
#end
docker run -d --name sentinel26379 -v /mydata/redis/6379/sentinel/sentinel.conf:/conf/sentinel.conf -v /mydata/redis/6379/sentinel/log:/var/log/sentinel --network host redis redis-sentinel /conf/sentinel.conf
先进行测试：
docker exec -it redis6379 redis-cli
> SHUTDOWN
> exit
cat /mydata/redis/6379/sentinel/log/26379.log
此时redis6381已成为新的master
再启动docker start redis6379 6379是slave了
测试成功，修改上面配置文件的sentinel monitor mymaster 192.168.243.4 6379 2 数字配置为2，代表至少有2个Sentinel节点认为主节点不可达，那么这个不可达的判定才是客观的。为了防止票数相同，sentinel启动奇数个。
slave
#slave1
mkdir /mydata/redis/6380/sentinel
mkdir /mydata/redis/6380/sentinel/log
vi /mydata/redis/6380/sentinel/sentinel.conf
#输入
port 26380
dir "/var/log/sentinel"
logfile "/var/log/sentinel/26380.log"
sentinel monitor mymaster 192.168.243.4 6380 2
sentinel down-after-milliseconds mymaster 5000
sentinel parallel-syncs mymaster 1
sentinel failover-timeout mymaster 180000
#end
docker run -d --name sentinel26380 -v /mydata/redis/6380/sentinel/sentinel.conf:/conf/sentinel.conf -v /mydata/redis/6380/sentinel/log:/var/log/sentinel --network host redis redis-sentinel /conf/sentinel.conf
#slave2
mkdir /mydata/redis/6381/sentinel
mkdir /mydata/redis/6381/sentinel/log
vi /mydata/redis/6381/sentinel/sentinel.conf
#输入
port 26381
dir "/var/log/sentinel"
logfile "/var/log/sentinel/26381.log"
sentinel monitor mymaster 192.168.243.4 6381 2
sentinel down-after-milliseconds mymaster 5000
sentinel parallel-syncs mymaster 1
sentinel failover-timeout mymaster 180000
#end
docker run -d --name sentinel26381 -v /mydata/redis/6381/sentinel/sentinel.conf:/conf/sentinel.conf -v /mydata/redis/6381/sentinel/log:/var/log/sentinel --network host redis redis-sentinel /conf/sentinel.conf
3.SpringBoot连接
application.yml
spring:
redis:
timeout: 5000
sentinel:
master: mymaster
nodes: 192.168.243.4:26379,192.168.243.4:26380,192.168.243.4:26381
controller
@Autowired
private StringRedisTemplate redisTemplate;
@RequestMapping("/redis")
public String redis() {
redisTemplate.opsForValue().set("test", "121323123");
String test = redisTemplate.opsForValue().get("test");
return "RESULT: " + test;
}
访问localhost:8080/redis
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