Redis日常运维-02主从复制
一 Redis安装
二 Redis主从复制
三 Redis哨兵模式高可用架构
四 Redis-cluster群集高可用架构
五 常见问题
架构
主 192.168.2.222
从 192.168.2.187
从 192.168.2.188
从库配置文件添加：
从 192.168.2.187
从 192.168.2.188
[root@rac1 config]# pwd
/usr/local/redis/config
[root@rac1 config]# vim redis.conf
#添加
slaveof 192.168.2.222 6379
重启数据库
[root@rac1 config]# redis-cli -p 6379 shutdown
[root@rac1 config]# redis-server redis.conf
验证数据同步
主库2.222
[root@cjcos src]# redis-cli
127.0.0.1:6379> set station dba
OK
127.0.0.1:6379> get station
"dba"
从库2.187
[root@rac1 config]# redis-cli
127.0.0.1:6379> get station
"dba"
从库2.188
[root@rac2 config]# redis-cli
127.0.0.1:6379> get station
"dba"
主库2.222查看同步信息
127.0.0.1:6379> info replication
# Replication
role:master
connected_slaves:2
slave0:ip=192.168.2.187,port=6379,state=online,offset=11208,lag=1
slave1:ip=192.168.2.188,port=6379,state=online,offset=11208,lag=1
master_replid:231ff9d15411b50038a43bb0726580f4dd788f80
master_replid2:0000000000000000000000000000000000000000
master_repl_offset:11208
second_repl_offset:-1
repl_backlog_active:1
repl_backlog_size:1048576
repl_backlog_first_byte_offset:1
repl_backlog_histlen:11208
同步日志
主库2.222
----redis.log
8511:M 23 Mar 2020 14:53:51.841 * Background saving terminated with success
8511:M 23 Mar 2020 14:53:51.842 * Synchronization with replica 192.168.2.187:6379 succeeded
8511:M 23 Mar 2020 14:53:57.272 * Replica 192.168.2.188:6379 asks for synchronization
8511:M 23 Mar 2020 14:53:57.272 * Full resync requested by replica 192.168.2.188:6379
8511:M 23 Mar 2020 14:53:57.272 * Starting BGSAVE for SYNC with target: disk
8511:M 23 Mar 2020 14:53:57.272 * Background saving started by pid 8528
8528:C 23 Mar 2020 14:53:57.326 * DB saved on disk
8528:C 23 Mar 2020 14:53:57.327 * RDB: 0 MB of memory used by copy-on-write
常见问题：
同步失败，日志如下：
----redis.log
29884:S 23 Mar 2020 14:50:29.152 * Connecting to MASTER 192.168.2.222:6379
29884:S 23 Mar 2020 14:50:29.152 * MASTER <-> REPLICA sync started
29884:S 23 Mar 2020 14:50:29.152 * Non blocking connect for SYNC fired the event.
29884:S 23 Mar 2020 14:50:29.153 # Error reply to PING from master: '-DENIED Redis is running in protected mode because protected mode is enabled, no bind address was specified, no authentication password is requested to clients. In this mode connections are only accepted from the loopback interface. If you want to connect '
解决方案：
---配置文件 redis.conf添加：
bind 0.0.0.0
欢迎关注我的微信公众号"IT小Chen"，共同学习，共同成长！！！
