redis主从同步
准备环境 三台centos,ip:10.211.55.14; 10.211.55.16; 10.211.55.17 各装有redis，端口号6379 修改配置redis.conf文件 <master>10.211.55.14 设置密码为 requirepass 1234 其他的根据各自需求配置 <slave> 10.211.55.16 replicaof 10.211.55.14 6379 masterauth 1234 其余的根据各自需求配置 scp redis.conf parallels@10.211.55.17:/home/parallels/program/redis-6.0.8/redis.conf 将配置文件传给另外一台机器 分别启动着三台机器 10.211.55.14查看info # Replication role:master connected_slaves:2 slave0:ip=10.211.55.17,port=6379,state=online,offset=1384,lag=1 slave1:ip=10.211.55.16,port=6379,state=online,offset=1384,lag=1 master_replid:f1301114e024f3a58c7c5f443cd5838ef732772f master_replid2:0000000000000000000000000000000000000000 master_repl_offset:1384 second_repl_offset:-1 repl_backlog_active:1 repl_backlog_size:1048576 repl_backlog_first_byte_offset:1 repl_backlog_histlen:1384 角色是master，连接两个salves 10.211.55.16查看info # Replication role:slave master_host:10.211.55.14 master_port:6379 master_link_status:up master_last_io_seconds_ago:2 master_sync_in_progress:0 slave_repl_offset:1440 slave_priority:100 slave_read_only:1 connected_slaves:0 master_replid:f1301114e024f3a58c7c5f443cd5838ef732772f master_replid2:0000000000000000000000000000000000000000 master_repl_offset:1440 second_repl_offset:-1 repl_backlog_active:1 repl_backlog_size:1048576 repl_backlog_first_byte_offset:867 repl_backlog_histlen:574 角色是slave，master地址是14的ip 在master上插入一个key发现副本上同步创建了， 在副本上新增一个key报错 (error) READONLY You can't write against a read only replica.
这是主从模式下的一个特点。副本只能读，不能写，
Replication的优点在于配置简单，一个master可以同步多个slaves，
master和salve之间的同步是非阻塞的
缺点在于，不具备高空可用行，master宕机后，写入操作停止
主从复制是全量复制，master会fork一个进程对内存做个快照，将这个快照发给salve，如果数据量太大，这个需要有足够的内存才能实现，并且影响服务器性能，
最主要的是网络不稳定，闪断也会做一个全量备份。
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