目录
哨兵核心功能:能够后台监控redis主机是否故障，如果故障了根据投票自动将从库转换为主库
1 操作系统信息和redis软件版本
root@u24-redis-120:~# cat /etc/issue
Ubuntu 24.04.2 LTS \n \l
root@u24-redis-120:~# redis-server --version
Redis server v=6.2.9 sha=00000000:0 malloc=libc bits=64 build=56edd385f7ce4c9b
2 集群架构图
2.1 redis主从集群
192.168.254.120 u24-redis-120 #主库
192.168.254.121 u24-redis-121 #从库
192.168.254.122 u24-redis-122 #从库
2.2 sentinel 集群
192.168.254.120 u24-redis-120 #端口26379
192.168.254.121 u24-redis-121 #端口26379
192.168.254.122 u24-redis-122 #端口26379
3 部署redis主从
源码编译安装参考：https://blog.csdn.net/zyb378747350/article/details/148295180
在redis主库上
#将redis软件拷贝到从库
rsync -r /usr/local/redis-6.2.9 192.168.254.121:/usr/local/
rsync -r /usr/local/redis-6.2.9 192.168.254.122:/usr/local/
#拷贝redis的rdb数据
rsync -r /redis 192.168.254.121:/
rsync -r /redis 192.168.254.122:/
#redis配置
主库
root@u24-redis-120:~# cat /usr/local/redis-6.2.9/etc/redis.conf
bind 0.0.0.0
daemonize yes
pidfile /redis/data/redis_6379.pid
loglevel notice
logfile "/redis/log/redis_6379.log"
databases 16
dir /redis/data
从库
root@u24-redis-121:~# cat /usr/local/redis-6.2.9/etc/redis.conf
bind 0.0.0.0
daemonize yes
pidfile /redis/data/redis_6379.pid
loglevel notice
logfile "/redis/log/redis_6379.log"
databases 16
dir /redis/data
slaveof 192.168.254.120 6379 #配置主从参数
从库
root@u24-redis-122:~# cat /usr/local/redis-6.2.9/etc/redis.conf
bind 0.0.0.0
daemonize yes
pidfile /redis/data/redis_6379.pid
loglevel notice
logfile "/redis/log/redis_6379.log"
databases 16
dir /redis/data
slaveof 192.168.254.120 6379 #配置主从参数
启动redis服务
/usr/local/redis-6.2.9/bin/redis-server /usr/local/redis-6.2.9/etc/redis.conf
查看信息
root@u24-redis-120:~# redis-cli
127.0.0.1:6379> info replication
# Replication
role:master
connected_slaves:2
slave0:ip=192.168.254.121,port=6379,state=online,offset=4176,lag=0 #从库
slave1:ip=192.168.254.122,port=6379,state=online,offset=4176,lag=1
master_failover_state:no-failover
master_replid:62750ed102cf2ec85d3bc812702eee5ea17e7568
master_replid2:0000000000000000000000000000000000000000
master_repl_offset:4176
second_repl_offset:-1
repl_backlog_active:1
repl_backlog_size:1048576
repl_backlog_first_byte_offset:1
repl_backlog_histlen:4176
4 sentinel 配置文件
三台sentinel配置和操作都一样
vi sentinel.conf
port 26379
daemonize yes
pidfile /redis/sentinel/sentinel_26379.pid
logfile "/redis/sentinel/sentinel_26379.log"
dir /redis/sentinel
sentinel monitor mymaster 192.168.254.120 6379 2
sentinel down-after-milliseconds mymaster 30000
sentinel parallel-syncs mymaster 1
sentinel failover-timeout mymaster 18000
创建目录
mkdir /redis/sentinel -p
#启动
/usr/local/redis-6.2.9/bin/redis-server /usr/local/redis-6.2.9/etc/sentinel.conf --sentinel
5 运维管理
5.1 查看sentinel统计信息
root@u24-redis-121:~# redis-cli -p 26379 info sentinel
# Sentinel
sentinel_masters:1
sentinel_tilt:0
sentinel_running_scripts:0
sentinel_scripts_queue_length:0
sentinel_simulate_failure_flags:0
master0:name=mymaster,status=ok,address=192.168.254.122:6379,slaves=2,sentinels=3
root@u24-redis-121:~# redis-cli -p 26379 sentinel masters
1) 1) "name"
2) "mymaster"
3) "ip"
4) "192.168.254.122"
5.2 主从故障切换测试
root@u24-redis-121:~# redis-cli -p 26379 info sentinel
# Sentinel
sentinel_masters:1
sentinel_tilt:0
sentinel_running_scripts:0
sentinel_scripts_queue_length:0
sentinel_simulate_failure_flags:0
master0:name=mymaster,status=ok,address=192.168.254.122:6379,slaves=2,sentinels=3
关闭主库192.168.254.122
root@u24-redis-122:~# redis-cli -p 6379 shutdown
root@u24-redis-122:~# ps aux|grep redis
root 3218 1.1 0.1 34012 4008 ? Ssl 16:30 0:12 /usr/local/redis-6.2.9/bin/redis-server *:26379 [sentinel]
root 3255 0.0 0.0 6544 2164 pts/0 S+ 16:49 0:00 grep --color=auto redis
验证信息
root@u24-redis-122:~# redis-cli -p 26379 info sentinel
# Sentinel
sentinel_masters:1
sentinel_tilt:0
sentinel_running_scripts:0
sentinel_scripts_queue_length:0
sentinel_simulate_failure_flags:0
master0:name=mymaster,status=ok,address=192.168.254.120:6379,slaves=2,sentinels=3
主库修改为192.168.254.120
root@u24-redis-120:~# redis-cli -p 6379 info replication
# Replication
role:master
connected_slaves:1
#只有一台从库
slave0:ip=192.168.254.121,port=6379,state=online,offset=302113,lag=0
master_failover_state:no-failover
master_replid:765b5275e77329cc6ab0f387968e1cde6044092f
master_replid2:f6f50ad20d4efc8e969894c46bef3620873314c5
master_repl_offset:302258
second_repl_offset:268372
repl_backlog_active:1
repl_backlog_size:1048576
repl_backlog_first_byte_offset:153637
repl_backlog_histlen:148622
#重启已经关闭redis服务
root@u24-redis-122:~# /usr/local/redis-6.2.9/bin/redis-server /usr/local/redis-6.2.9/etc/redis.conf
root@u24-redis-120:~# redis-cli -p 6379 info replication
# Replication
role:master
connected_slaves:2
#已经转变为从库
slave0:ip=192.168.254.121,port=6379,state=online,offset=322707,lag=0
slave1:ip=192.168.254.122,port=6379,state=online,offset=322707,lag=0
master_failover_state:no-failover
master_replid:765b5275e77329cc6ab0f387968e1cde6044092f
master_replid2:f6f50ad20d4efc8e969894c46bef3620873314c5
master_repl_offset:322707
second_repl_offset:268372
repl_backlog_active:1
repl_backlog_size:1048576
repl_backlog_first_byte_offset:153637
repl_backlog_histlen:169071
5.3 强制主从切换
root@u24-redis-121:~# redis-cli -p 26379 info sentinel
# Sentinel
sentinel_masters:1
sentinel_tilt:0
sentinel_running_scripts:0
sentinel_scripts_queue_length:0
sentinel_simulate_failure_flags:0
master0:name=mymaster,status=ok,address=192.168.254.120:6379,slaves=2,sentinels=3
#强制提升主库
root@u24-redis-121:~# redis-cli -p 26379 sentinel failover mymaster
OK
root@u24-redis-121:~# redis-cli -p 26379 info sentinel
# Sentinel
sentinel_masters:1
sentinel_tilt:0
sentinel_running_scripts:0
sentinel_scripts_queue_length:0
sentinel_simulate_failure_flags:0
#由源码192.168.254.120转换192.168.254.122
master0:name=mymaster,status=ok,address=192.168.254.122:6379,slaves=2,sentinels=3
6 go编写应用业务测试
package main
import (
"context"
"fmt"
"github.com/redis/go-redis/v9"
)
func main() {
rdb := redis.NewFailoverClusterClient(&redis.FailoverOptions{
MasterName: "mymaster",
SentinelAddrs: []string{"192.168.254.120:26379", "192.168.254.121:26379", "192.168.254.122:26379"},
})
ctx := context.Background()
//写入redis
rdb.Set(ctx, "key02", "value-02", 0)
//读取redis
val, err := rdb.Get(ctx, "key02").Result()
if err != nil {
fmt.Printf("操作错误")
return
}
fmt.Printf(val)
}
测试结果：
redis: 2025/06/01 18:15:16 sentinel.go:746: sentinel: selected addr=192.168.254.121:26379 masterAddr=192.168.254.122:6379
value-02
Process finished with the exit code 0