redis导入rdb文件的方法：
1.在源实例生成aof数据，代码命令如下：
# 清空上文目标实例全部数据
[root@172.20.0.1 ~]# redis-cli -h 172.20.0.2 -a password flushall
OK
# 源实例开启aof功能，将在dir目录下生成appendonly.aof文件
[root@172.20.0.1 ~]# redis-cli -h 172.20.0.1 -a password config set appendonly yes
OK
2.在目标实例导入aof数据，代码命令如下：
# 假设appendonly.aof就在当前路径下
[root@172.20.0.1 ~]# redis-cli -h 172.20.0.2 -a password --pipe < appendonly.aof
All data transferred. Waiting for the last reply...
Last reply received from server.
errors: 0, replies: 5
# 源实例关闭aof功能
[root@172.20.0.1 ~]# redis-cli -h 172.20.0.1 -a password config set appendonly no
OK
