主机数据更新后根据配置和策略，自动同步到备机的一个过程（master/slaver机制），Master以写为主，Slave以读为主
2、能干嘛读写分离，性能扩展
容灾快速恢复
3、怎么玩：主从复制拷贝多个文件include(写绝对路径)
开启daemonizeyes
Pid文件名字pidfile
指定端口port
Log文件名字
名字dbfilename
Apponly关掉或者换名字
3.1、新建，填写以下内容include/myredis//var/run/redis_6379.3.2、新建，填写以下内容
include/myredis//var/run/redis_6380.3.3、新建，填写以下内容
include/myredis//var/run/redis_6381.
slave-priority10，设置从机的优先级，值越小，优先级越高，用于选举主机时使用。默认100
3.4、启动三台Redis服务器[root@iZ2ze2rikqlh3ql1n2cw61Zbin]./redis-server/myredis/[root@iZ2ze2rikqlh3ql1n2cw61Zbin]./redis-server/myredis/3.5、查看系统进程，看三台Redis是否启动成功
[root@iZ2ze2rikqlh3ql1n2cw61Zbin]打印主从复制的相关信息
[root@iZ2ze2rikqlh3ql1n2cw61Zbin]Replicationrole:masterconnected_slaves:0master_failover_state:no-failovermaster_replid:fbd16328dcd4296f8347b0b15934aced272f01b3master_replid2:0000000000000000000000000000000000000000master_repl_offset:0second_repl_offset:-1repl_backlog_active:0repl_backlog_size:1048576repl_backlog_first_byte_offset:0repl_backlog_histlen:0
6380信息
[root@iZ2ze2rikqlh3ql1n2cw61Zbin]Replicationrole:masterconnected_slaves:0master_failover_state:no-failovermaster_replid:934a431bc633b5078ac1fc9fb890fca9b5ef6408master_replid2:0000000000000000000000000000000000000000master_repl_offset:0second_repl_offset:-1repl_backlog_active:0repl_backlog_size:1048576repl_backlog_first_byte_offset:0repl_backlog_histlen:0
6381信息
[root@iZ2ze2rikqlh3ql1n2cw61Zbin]Replicationrole:masterconnected_slaves:0master_failover_state:no-failovermaster_replid:8d00aa536b59c128813c348b35eced8d4486f09cmaster_replid2:0000000000000000000000000000000000000000master_repl_offset:0second_repl_offset:-1repl_backlog_active:0repl_backlog_size:1048576repl_backlog_first_byte_offset:0repl_backlog_histlen:03.7、配从(库)不配主(库)
----------执行后查看:6379inforeplication----------执行后查看:6380:6380inforeplication----------执行后查看:6381inforeplication#Replicationrole:slavemaster_host:127.0.0.1master_port:6379master_link_status:downmaster_last_io_seconds_ago:-1master_sync_in_progress:0slave_read_repl_offset:1slave_repl_offset:1master_link_down_since_seconds:-1slave_priority:100slave_read_only:1replica_announced:1connected_slaves:0master_failover_state:no-failovermaster_replid:8d00aa536b59c128813c348b35eced8d4486f09cmaster_replid2:0000000000000000000000000000000000000000master_repl_offset:0second_repl_offset:-1repl_backlog_active:0repl_backlog_size:1048576repl_backlog_first_byte_offset:0repl_backlog_histlen:0
在主机上写，在从机上可以读取数据
在从机上写数据报错
主机挂掉，从机可以继续得到数据，重启就行，一切如初
从机重启需重设：（可以将配置增加到文件中。永久生效）
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