1.環境準備
三臺主機實現:確保三臺服務器redis的版本一致,以host1爲主服務,其餘爲從
host1 192.168.1.9 master
host2 192.168.1.106 slave1
host3 192.168.1.110 slave2
2.配置host1的哨兵配置文件sentinel.conf
[root@localhost ~]# vim /app/redis/etc/sentinel.conf
bind 192.168.1.9
port 6379
daemonize yes
logfile "sentinel_26379.log"
dir "/app/redis/log"
sentinel monitor mymaster 192.168.1.9 6379 2 #當有2個及以上的哨兵判定master宕機時會選舉新的master
sentinel auth-pass mymaster 123456
sentinel down-after-milliseconds mymaster 30000 #主觀下線的時間
sentinel parallel-syncs mymaster 1 #向新 master 同步數據的 slave 數量,數字越 小總同步時間越長
sentinel failover - timeout mymaster 180000 #全部slave指向新的master所需的超時時間
sentinel deny-scripts-reconfig yes
3.配置host2的哨兵配置文件sentinel.conf,只需修改綁定的ip其餘與主相同
[root@localhost ~]# vim /app/redis/etc/sentinel.conf
bind 192.168.1.106
……
……
4.配置host3的哨兵配置文件sentinel.conf,只需修改綁定的ip其餘與主相同
[root@localhost ~]# vim /app/redis/etc/sentinel.conf
bind 192.168.1.110
……
……
5.在命令行將host2和host3的主服務指向host1
host2:
[root@localhost ~]# redis-cli
127.0.0.1:6379> auth 12345
OK
127.0.0.1:6379> slaveof 192.168.1.9 6379
127.0.0.1:6379> config set masterauth 123456
127.0.0.1:6379> info replication
#Replication
role:master
connected_slaves:1
slave:ip=192.168.1.106,port=6379,state=online,offset=1541332,lag=1
……
……
host3:
[root@localhost ~]# redis-cli
127.0.0.1:6379> auth 12345
OK
127.0.0.1:6379> slaveof 192.168.1.9 6379
127.0.0.1:6379> config set masterauth 123456
127.0.0.1:6379> info replication
#Replication
role:master
connected_slaves:1
slave0:ip=192.168.1.106,port=6379,state=online,offset=1541332,lag=1
slave1:ip=192.168.1.110,port=6379,state=online,offset=1541332,lag=1
……
……
6.三臺服務同時開啓哨兵服務
[root@localhost ~]# redis-server /app/redis/etc/redis.conf
7.將host1主服掛掉模擬宕機測試,測試是否其中的salve有一臺會被自動提高爲主服務
hsot1服務器:
[root@localhost ~]# ss -tnlp
State Recv-Q Send-Q Local Address:Port Peer Address:Port
LISTEN 0 511 192.168.1.9:26379 *:*
users:(("redis-sentinel",pid=2413,fd=6))
LISTEN 0 511 192.168.1.9:6379 *:*
users:(("redis-server",pid=2369,fd=7))
LISTEN 0 511 127.0.0.1:6379 *:*
users:(("redis-server",pid=2369,fd=6))
root@localhost ~]# kill -9 2413
host2服務器:能夠看到此服務被提高爲主服務
127.0.0.1:6379> info replication
#Keyspace
db0:keys=7,expires=0,avg_ttl=0
127.0.0.1:6379> info replication
#Replication
role:master #角色切換爲主
connected_slaves:1 #當親從服務的鏈接個數
slave0:ip=192.168.1.110,port=6379,state=online,offset=1728348,lag=1
master_replid:7c8eb18c7c05b8f2d9f29028d016f9c40e8c2ce0
master_replid2:a8efce354ba8249ff264dcba60ac21030253b829
master_repl_offset:1728348
second_repl_offset:63848
repl_backlog_active:1
repl_backlog_size:1048576
repl_backlog_first_byte_offset:679773
repl_backlog_histlen:1048576
host2服務器:此時的主指定爲host2服務器
127.0.0.1:6379> info replication
#Replication
role:slave
master_host:192.168.1.106 #主服務爲host2
master_port:6379
master_link_status:up
master_last_io_seconds_ago:0
master_sync_in_progress:0
slave_repl_offset:1758995
slave_priority:100
slave_read_only:1
……
……
8.當host1服務恢復正常,重啓,會被自動切換爲從服務
1)重啓以前先修改redis.conf配置文件,添加鏈接主服務的認證密碼便可
[root@localhost ~]# vim /app/redis/etc/redis.conf
masterauth 123456
2)在重啓host1的redis服務
[root@localhost ~]# redis-server /app/redis/etc/redis.conf
3)查看其所處的狀態,能夠看到被切換的從服務
127.0.0.1:6379> info replication
#Replication
role:slave
master_host:192.168.1.106 #主服務指向host2
master_port:6379
master_link_status:up
master_last_io_seconds_ago:0
master_sync_in_progress:0
slave_repl_offset:1829345
slave_priority:100
slave_read_only:1
……
……
9.在查看host2被提高爲新的主後的鏈接狀態
127.0.0.1:6379> info replication
#Replication
role:master
connected_slaves:2
slave0:ip=192.168.1.110,port=6379,state=online,offset=1854211,lag=0
slave1:ip=192.168.1.9,port=6379,state=online,offset=1854072,lag=1
master_replid:7c8eb18c7c05b8f2d9f29028d016f9c40e8c2ce0
master_replid2:a8efce354ba8249ff264dcba60ac21030253b829
master_repl_offset:1854211
second_repl_offset:63848
……
……