Redis主從持久化測試

1:redis主從環境，均未開啓持久化；
當主實例宕機，從實例上的數據不受影響；
當主恢復後，主實例上的數據將會繼續同步到從實例，即原來的值將變爲空值；

[ root@server11 ~]# /usr/local/redis2/bin/redis-cli -h 192.168.1.112 -a 123 info |grep -A 3 'Replication' # Replication role:master connected_slaves:1 slave0:192.168.1.113,6379,online [root@server11 ~]# /usr/local/redis2/bin/redis-cli -h 192.168.1.112 -a 123  redis 192.168.1.112:6379> set 1 a OK redis 192.168.1.112:6379> get 1 "a" [root@server11 ~]# /usr/local/redis2/bin/redis-cli -h 192.168.1.112 -a 123 shutdown [root@server12 ~]# tail -f /var/log/messages Dec  3 15:27:34 server12 redis[32151]: Connecting to MASTER... Dec  3 15:27:34 server12 redis[32151]: MASTER <-> SLAVE sync started Dec  3 15:27:34 server12 redis[32151]: Error condition on socket for SYNC: Connection refused [root@server12 ~]# /usr/local/redis2/bin/redis-cli -h 192.168.1.113 -a 123  redis 192.168.1.113:6379> get 1 "a" [root@server11 ~]# /usr/local/redis2/bin/redis-server /usr/local/redis2/etc/redis.conf [root@server11 ~]# /usr/local/redis2/bin/redis-cli -h 192.168.1.112 -a 123  redis 192.168.1.112:6379> get 1 (nil) redis 192.168.1.112:6379> exit [root@server11 ~]# /usr/local/redis2/bin/redis-cli -h 192.168.1.113 -a 123  redis 192.168.1.113:6379> get 1 (nil)

2：redis主從環境，從實例開啓快照持久化
當主實例宕機，從實例上的數據不受影響；
當主恢復後，主實例上的數據將會繼續同步到從實例，即原來的值將變爲空值；

[root@server11 ~]# /usr/local/redis2/bin/redis-cli -h 192.168.1.112 -a 123   redis 192.168.1.112:6379> get 1 (nil) redis 192.168.1.112:6379> set 1 a OK redis 192.168.1.112:6379> set 2 b OK redis 192.168.1.112:6379> exit [root@server11 ~]# /usr/local/redis2/bin/redis-cli -h 192.168.1.112 -a 123 shutdown [root@server12 ~]# /usr/local/redis2/bin/redis-cli -h 192.168.1.113 -a 123   redis 192.168.1.113:6379> get 1 "a" redis 192.168.1.113:6379> get 2 "b" redis 192.168.1.113:6379> exit [root@server11 ~]# /usr/local/redis2/bin/redis-cli -h 192.168.1.112 -a 123   redis 192.168.1.112:6379> get 1 (nil) redis 192.168.1.112:6379> get 2 (nil) redis 192.168.1.112:6379> exit [root@server12 ~]# /usr/local/redis2/bin/redis-cli -h 192.168.1.113 -a 123   redis 192.168.1.113:6379> get 1 (nil) redis 192.168.1.113:6379> get 2 (nil) redis 192.168.1.113:6379> exit

  

 3：推動一層，當主，從實例均宕機的狀況下會如何呢？

 

[root@server11 ~]# /usr/local/redis2/bin/redis-cli -h 192.168.1.112 -a 123   redis 192.168.1.112:6379> set 1 a OK redis 192.168.1.112:6379> set 2 b OK redis 192.168.1.112:6379> set 3 c OK redis 192.168.1.112:6379> exit [root@server11 ~]# /usr/local/redis2/bin/redis-cli -h 192.168.1.113 -a 123   redis 192.168.1.113:6379> get 1 "a" redis 192.168.1.113:6379> get 2 "b" redis 192.168.1.113:6379> get 3 "c" redis 192.168.1.113:6379> exit 此次先關閉從實例，再關閉主實例！啓動則先啓動從實例，測試數據；再啓動主實例，再測試數據！ [root@server11 ~]# /usr/local/redis2/bin/redis-cli -h 192.168.1.112 -a 123 shutdown [root@server12 ~]# /usr/local/redis2/bin/redis-cli -h 192.168.1.113 -a 123 shutdown [root@server12 ~]# /usr/local/redis2/bin/redis-server /usr/local/redis2/etc/redis.conf [root@server11 ~]# /usr/local/redis2/bin/redis-cli -h 192.168.1.113 -a 123   redis 192.168.1.113:6379> get 1 "a" redis 192.168.1.113:6379> get 2 "b" redis 192.168.1.113:6379> get 3 "c" [root@server11 ~]# /usr/local/redis2/bin/redis-server /usr/local/redis2/etc/redis.conf [root@server11 ~]# /usr/local/redis2/bin/redis-cli -h 192.168.1.112 -a 123   redis 192.168.1.112:6379> get 1 (nil) redis 192.168.1.112:6379> get 2 (nil) redis 192.168.1.112:6379> get 3 (nil) redis 192.168.1.112:6379> exit [root@server11 ~]# /usr/local/redis2/bin/redis-cli -h 192.168.1.113 -a 123   redis 192.168.1.113:6379> get 1 (nil) redis 192.168.1.113:6379> get 2 (nil) redis 192.168.1.113:6379> get 3 (nil) redis 192.168.1.113:6379> exit

實踐證實，在redis主從讀寫分離條件下，快照持久化只有開在主實例側才能夠保證數據能夠跨越實例重啓！

[root@server11 ~]# /usr/local/redis2/bin/redis-cli -h 192.168.1.112 -a 123   redis 192.168.1.112:6379> set 1 a OK redis 192.168.1.112:6379> set 2 b OK redis 192.168.1.112:6379> set 3 c OK redis 192.168.1.112:6379> set 4 d OK redis 192.168.1.112:6379> exit [root@server11 ~]# /usr/local/redis2/bin/redis-cli -h 192.168.1.113 -a 123   redis 192.168.1.113:6379> get 4 "d" redis 192.168.1.113:6379> exit [root@server11 ~]# /usr/local/redis2/bin/redis-cli -h 192.168.1.112 -a 123 shutdown [root@server12 ~]# /usr/local/redis2/bin/redis-cli -h 192.168.1.113 -a 123 shutdown [root@server11 ~]# /usr/local/redis2/bin/redis-server /usr/local/redis2/etc/redis.conf [root@server12 ~]# /usr/local/redis2/bin/redis-server /usr/local/redis2/etc/redis.conf [root@server11 ~]# /usr/local/redis2/bin/redis-cli -h 192.168.1.112 -a 123  get 4 "d" [root@server11 ~]# /usr/local/redis2/bin/redis-cli -h 192.168.1.113 -a 123  get 4 "d"