查看Redis后台，有如下错误日志：
1 [2963] 07 Sep 09:15:07.053 * 10 changes in 300 seconds. Saving
2 [2963] 07 Sep 09:15:07.055 * Background saving started by pid 3143
3 [3143] 07 Sep 09:15:07.058 # Failed opening .rdb for saving: Permission denied
4 [2963] 07 Sep 09:15:07.156 # Background saving error
根据提示，可以看出是权限问题。
进入redis.conf配置文件。
搜索dir，找到如下内容：
1 # The working directory.
2 #
3 # The DB will be written inside this directory, with the filename specified
4 # above using the 'dbfilename' configuration directive.
5 #
6 # The Append Only File will also be created inside this directory.
7 #
8 # Note that you must specify a directory here, not a file name.
9 dir ./
如果是./表示：运行reides命令的目录(例如，$redis_home中，执行./bin/redis-server etc/redis.conf命令，./则代表的是$redis_home)。
查看当前用户对dir所配置的路径是否有写权限。
调整权限后，应该能看到如下信息：
1 [3223] 07 Sep 09:29:57.007 * 10 changes in 300 seconds. Saving
2 [3223] 07 Sep 09:29:57.008 * Background saving started by pid 3270
3 [3270] 07 Sep 09:29:57.028 * DB saved on disk
4 [3270] 07 Sep 09:29:57.029 * RDB: 6 MB of memory used by copy-on-write
5 [3223] 07 Sep 09:29:57.112 * Background saving terminated with success
表示成功写入磁盘文件，即该问题解决。
现在查看dir所配置的目录下应该有dump.rdb文件。