1、修改配置文件参数，“persistence-available no” 主从复制失败。

    原因是该方式关闭了用于主从同步功能的快照方式。在配置文件文件有这样一段话：“这个配置一般不会和RDB或者AOF的持久化相关的配置一起使用”，因此这个配置使用在单节点作为LRU缓存服务时使用。

[4744] 11 Jul 13:15:47.234 * Connecting to MASTER 127.0.0.1:6379[4744] 11 Jul 13:15:47.874 * MASTER <-> SLAVE sync started[4744] 11 Jul 13:15:47.889 * Non blocking connect for SYNC fired the event.[4744] 11 Jul 13:15:47.889 * Master replied to PING, replication can continue...[4744] 11 Jul 13:15:47.889 * (Non critical) Master does not understand REPLCONF listening-port: -ERR unknown command 'REPLCONF'[4744] 11 Jul 13:15:47.889 * (Non critical) Master does not understand REPLCONF capa: -ERR unknown command 'REPLCONF'[4744] 11 Jul 13:15:47.889 * Partial resynchronization not possible (no cached master)[4744] 11 Jul 13:15:47.889 * Master does not support PSYNC or is in error state (reply: -ERR unknown command 'PSYNC')[4744] 11 Jul 13:15:47.889 * Retrying with SYNC...[4744] 11 Jul 13:15:47.889 # MASTER aborted replication with an error: ERR unknown command 'SYNC'

2、持久化命令，BGSAVE、BGREWRITEAOF分别是在后台保存RDB和AOF文件用于手动触发生成持久化文件。

3、redis常用做为后台守护进程时，设置“daemonize yes”，设置后会生成类似/var/run/redis.pid文件，可进行查看。