IP:192.168.225.128 环境：centos7
一、安装redis
步骤 1、首先确认系统中是否存在C语言的编译环境
# gcc -version
或者 # g++ --version
yum install -y gcc
步骤 2、下载redis安装包
wget http://download.redis.io/releases/redis-3.2.10.tar.gz
步骤 3、解压到/usr/local/redis
# tar -zxvf redis-3.2.10.tar.gz
# mv redis-3.2.10 /usr/local/redis
# cd redis
步骤 4、安装
# make
# make test
遇到报错
Executing test client: NOREPLICAS Not enough good slaves to write..
可以修改文件tests/integration/replication-2.tcl，将after 1000改为after 10000以延长等待时间。
# make test
# make install PREFIX=/usr/local/redis PREFIX安装指定目录 否则安装到/usr/local/bin里面了
步骤 5、修改配置文件
bind 192.168.225.128
port 6379
timeout 0
daemonize yes
pidfile /var/run/redis6379.pid
loglevel debug
logfile /var/log/redis6379.log
步骤 6、启动
# cd /usr/local/redis6379/bin
# ./redis-server ../redis6379.conf &
# cd /usr/local/redis6380/bin
# ./redis-server ../redis6380.conf &
步骤 7、6380端口启动服务，方法如上，只不过存放的目录不同
安装位置：/usr/local/redis6380
配置文件：/usr/local/redis6380/redis6380.conf
启动后pid文件：/var/run/redis_6380.pid
日志文件：/var/log/redis6380.log
数据文件位置：/data/redis6380/
二、配置redis主从
（一个服务器上启动两个redis，端口为6379和6380, 192.168.225.128:6379主，192.168.225.128:6380从
步骤 1、主redis服务器6379
不需要改动
步骤 2、从redis服务器6380
vi /etc/redis/6380.conf
slave-serve-stale-data yes
# slaveof <masterip> <masterport>下面添加一句
slaveof 192.168.225.128 6379
步骤 3、启动redis
先关闭redis
# redis-cli -h 192.168.225.128 -p 6380 shutdown
# cd /usr/local/redis6379/
# bin/redis-server redis6379.conf &
# cd /usr/local/redis6380/
# bin/redis-server redis6380.conf &
步骤 4、查看redis进程
# ps -ef |grep redis
步骤 5、验证主从是否同步（128:6379和128:6380）
[root@bogon redis6379]# redis-cli -h 192.168.225.128 -p 6379
192.168.225.128:6379> set ma right
OK
192.168.225.128:6379> set Li class2
OK
192.168.225.128:6379> keys *
1) "ma"
2) "fangchan"
3) "Li"
192.168.225.128:6379>
[root@bogon redis6379]# redis-cli -h 192.168.225.128 -p 6380
192.168.225.128:6380> keys *
1) "ma"
2) "Li"
3) "fangchan"
192.168.225.128:6380>
步骤 6、主从同步正常
步骤 7、从库默认是只读的
192.168.225.128:6380> set lll beaty
(error) READONLY You can't write against a read only slave.
三、redis主从切换
192.168.225.128:6379主，192.168.225.128:6380从
步骤 1、停止主库redis
# redis-cli -h 192.168.225.128 -p 6379 shutdown
步骤 2、将从redis设为主redis
[root@bogon redis6379]# redis-cli -h 192.168.225.128 -p 6380 slaveof NO ONE
OK
步骤 3、测试从redis是否切换为主redis
[root@bogon redis6379]# redis-cli -h 192.168.225.128 -p 6380
192.168.225.128:6380> set apu new
OK
192.168.225.128:6380> get apu
"new"
192.168.225.128:6380>
从库可以写入，切换成功
步骤 4、原来的主redis6379重新恢复正常，需要重新切换回去
1.将现在的主redis6380数据进行保存
[root@bogon redis6379]# redis-cli -h 192.168.225.128 -p 6380
192.168.225.128:6380> set apu new
OK
192.168.225.128:6380> get apu
"new"
192.168.225.128:6380> save
2.将现在的主redis数据目录下dump.rdb文件拷贝覆盖原来主redis6379数据目录下面
3.启动原来的redis6379
# cd /usr/local/redis6379
# bin/redis-server redis6379.conf &
4.将现在的主redis6380切换为从库
[root@bogon redis6379]# redis-cli -h 192.168.225.128 -p 6380 slaveof 192.168.225.128 6379
OK
步骤 5、查看主库redis是否正常
之前在从库中添加的key，此时在主库6379中都可以查看
步骤 6、验证主从同步是否正常
主redis6379写入，从redis6380可正常同步； 从redis只支持读，不支持写入
转载于:https://www.cnblogs.com/icyblog/p/7427235.html
