redis作为nosql数据库主流产品之一,现在被广泛使用,如何保证redis的高可用和故障自动切换,本文介绍了redis的主从配置方法,及故障切换的sentinel搭建。如下:
环境说明:
server 系统:CentOS 6.5 X64
redis软件说明:2.8.19版本
一:配置主从redis
1、架构:
主库:172.16.52.130
从库1:172.16.52.131
从库2:172.16.52.132
2、主从操作:
tar xvf redis-2.8.19.tar.gz -C /usr/local
cd /usr/local/redis-2.8.19/
make && make install
mkdir data
vim redis.conf
---
#在最后可以直接加如下命令
aof-rewrite-incremental-fsync yes
daemonize yes
logfile /var/log/redis.log
syslog-enabled no
dir /usr/local/redis-2.8.19/data
requirepass system #为下面sentinel做准备主从均需配置
slaveof 172.16.52.130 6379 #从库加上该配置,主库不加该配置
masterauth system #为下面sentinel做准备主从均需配置
#以上设计到的密码必须相同,若设置则都设置,否则都不设置
---
3、数据库启停操作
启动:redis-server /usr/local/redis/redis.conf
关闭:redis-cli -a system shutdown
notes:
1)master可以不设置登陆密码,则slave不用设置masterauth
2)master不设置登陆密码时,关闭命令为:redis-cli shutdown
4.测试
redis-cli -a system
info
---
slave0:ip=172.16.52.131,port=6379,state=online,offset=211171,lag=0
slave1:ip=172.16.52.130,port=6379,state=online,offset=211171,lag=1
---
同时可以进行数据测试:在主库上建立插入数据,看从库是否同步。
二、配置sentinel
vim /etc/sentinel.conf
---
port 26379
daemonize yes
logfile "/var/log/sentinel.log"
sentinel monitor mymaster 172.16.52.132 6379 1
sentinel down-after-milliseconds mymaster 3000
sentinel failover-timeout mymaster 10000
sentinel auth-pass mymaster system #本验证密码和上面主从密码保持一致,若主从没有设置验证密码,则不需要配置本条
---
启停sentinel
redis-sentinel /etc/sentinel.conf
redis-cli -p 26379 shutdown
日志查看:
tail -f /var/log/sentinel.log
[24259] 27 Apr 16:42:58.280 # Sentinel runid is f6688a7526b2b5f3298dc0c5348ae78207f1c1be
[24259] 27 Apr 16:42:58.280 # +monitor master mymaster 172.16.52.130 6379 quorum 1
[24259] 27 Apr 16:42:58.280 * +slave slave 172.16.52.132:6379 172.16.52.132 6379 @ mymaster 172.16
.52.130 6379
[24259] 27 Apr 16:42:58.280 * +slave slave 172.16.52.131:6379 172.16.52.131 6379 @ mymaster 172.16
.52.130 6379
为保证redis高可用,使得sentinel有意义,至少选择两台及其以上sentinel,一般建议最好三台,以确保投票机制