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Redis主从持久化测试

發布時間：2023/12/4 数据库 25 豆豆

生活随笔收集整理的這篇文章主要介紹了 Redis主从持久化测试小編覺得挺不錯的,現在分享給大家,幫大家做個參考.

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

[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，從實例開啟快照持久化
當主實例宕機，從實例上的數據不受影響；
當主恢復后，主實例上的數據將會繼續同步到從實例，即原來的值將變為空值；

?[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：推進一層，當主，從實例均宕機的情況下會如何呢？

[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

這次先關閉從實例，再關閉主實例！啟動則先啟動從實例，測試數據；再啟動主實例，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

實踐證明，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可以保證數據可以跨越實例重啟！

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