redis6的安装详情及用法详见 >>>> Linux系统下的Redis的安装以及使用
主机数据更新后根据配置和策略, 自动同步到备机的master/slaver机制,Master以写为主,Slave以读为主
可以实现 读写分离,性能扩展 容灾快速恢复 等功能

环境:
centos7
主机1:127.0.0.1 6379
主机2:127.0.0.1 6380
主机3:127.0.0.1 6381
1、复制三份redis.conf文件
分别改名为redis6379.conf redis6380.conf redis6381.conf
2、分别修改以下配置文件的内容
include /myredis/redis.conf
pidfile /var/run/redis_6379.pid
port 6379
dbfilename dump6379.rdb
include /myredis/redis.conf
pidfile /var/run/redis_6380.pid
port 6380
dbfilename dump6380.rdb
include /myredis/redis.conf
pidfile /var/run/redis_6381.pid
port 6381
dbfilename dump6381.rdb
3、启动三台Redis服务器
[root@iZ2ze2rikqlh3ql1n2cw61Z bin]# kill -9 57468
[root@iZ2ze2rikqlh3ql1n2cw61Z bin]# ./redis-server /myredis/redis6379.conf
[root@iZ2ze2rikqlh3ql1n2cw61Z bin]# ./redis-server /myredis/redis6380.conf
[root@iZ2ze2rikqlh3ql1n2cw61Z bin]# ./redis-server /myredis/redis6381.conf
4、查看系统进程,看三台Redis是否启动成功
[root@iZ2ze2rikqlh3ql1n2cw61Z bin]# ps -ef | grep redis
root 58188 1 0 07:26 ? 00:00:00 ./redis-server *:6379
root 58194 1 0 07:26 ? 00:00:00 ./redis-server *:6380
root 58200 1 0 07:26 ? 00:00:00 ./redis-server *:6381
root 58209 58052 0 07:27 pts/0 00:00:00 grep --color=auto redis
5、查看三台主机运行情况
info replication #打印主从复制的相关信息
6379信息
[root@iZ2ze2rikqlh3ql1n2cw61Z bin]# ./redis-cli -p 6379
127.0.0.1:6379> info replication
NOAUTH Authentication required.
127.0.0.1:6379> auth 123456
OK
127.0.0.1:6379> info replication
# Replication
role:master
connected_slaves:0
master_failover_state:no-failover
master_replid:fbd16328dcd4296f8347b0b15934aced272f01b3
master_replid2:0000000000000000000000000000000000000000
master_repl_offset:0
second_repl_offset:-1
repl_backlog_active:0
repl_backlog_size:1048576
repl_backlog_first_byte_offset:0
repl_backlog_histlen:0
6380信息
[root@iZ2ze2rikqlh3ql1n2cw61Z bin]# ./redis-cli -p 6380
127.0.0.1:6380> auth 123456
OK
127.0.0.1:6380> info replication
# Replication
role:master
connected_