首先参看一下redis 3.2.8的安装
传送门:biubiubiu 飞去吧：http://www.cnblogs.com/bing-yu12/p/6582086.html
我的主从搭建：
redis 主环境：
centos 6.7
ip：192.168.184.3
redis 3.2.8
redis.conf的重要配置：
bind 127.0.0.1选项后面加上192.168.184.3 让外部机器也可以访问该ip
iptables规则清除
selinux关闭：setenforce 0 或者vim /etc/sysconfig/selinux 中设置为disabled
redis 从
配置变化部分：
bind 127.0.0.1 即可
从只有读的权限,所以：
slave-read-only no 打开
配置文件修改后，主和从都要重启redis服务，然后在主上修改数据：
[root@alex redis]# ./bin/redis-cli 127.0.0.1:6379> set key alexander OK
从上的操作读：
[root@alex redis]# ./bin/redis-cli 127.0.0.1:6379> get key "alexander"
查看日志：
tail -f /var/log/redis/redis.log
5833:S 13 Mar 11:55:03.161 * Full resync from master: c95b2c82899b47186301e42c23dc7f53db8f48ab:970 5833:S 13 Mar 11:55:03.245 * MASTER <-> SLAVE sync: receiving 106 bytes from master 5833:S 13 Mar 11:55:03.246 * MASTER <-> SLAVE sync: Flushing old data 5833:S 13 Mar 11:55:03.246 * MASTER <-> SLAVE sync: Loading DB in memory 5833:S 13 Mar 11:55:03.247 * MASTER <-> SLAVE sync: Finished with success 5833:S 13 Mar 11:57:59.063 * 1 changes in 900 seconds. Saving...
说明主从搭建成功了。
注意,在上面的步骤中少了一个从数据上拉取主上的信息的命令：
127.0.0.1:6379> slaveof 192.168.184.3 6379 OK 127.0.0.1:6379> get key "alex"
当在从上写数据的时候，会打破redis的主从关系，这个时候,你也可以使用该命令回复主从关系，你也可以在从的配置文件中指定：
slaveof 192.168.184.3 6379
对于该配置文件的解释：文档中有这样的说明：
################################# REPLICATION #################################
# Master-Slave replication. Use slaveof to make a Redis instance a copy of
# another Redis server. A few things to understand ASAP about Redis replication.
#
# 1) Redis replication is asynchronous, but you can configure a master to
# stop accepting writes if it appears to be not connected with at least
# a given number of slaves.
# 2) Redis slaves are able to perform a partial resynchronization with the
# master if the replication link is lost for a relatively small amount of
# time. You may want to configure the replication backlog size (see the next
# sections of this file) with a sensible value depending on your needs.
# 3) Replication is automatic and does not need user intervention. After a
# network partition slaves automatically try to reconnect to masters
# and resynchronize with them.
#
slaveof 192.168.184.3 6379
# slaveof <masterip> <masterport>
看第二条:大概的意思就是，如果主从关系紊乱，当主上的数据再修改以后，那么从上的数据会自动和主上的数据进行同步。
如有疑问，欢迎讨论QQ:1443353268