Failed opening .rdb for saving: Permission denied

[Justin-YGG]

dir /opt/redis/

dbfilename dump.rdb

redis log

1400:M 06 Jul 10:48:00.253 # Server started, Redis version 3.0.1
1400:M 06 Jul 10:48:00.254 * The server is now ready to accept connections on port 6379
1400:M 06 Jul 10:53:01.001 * 10 changes in 300 seconds. Saving...
1400:M 06 Jul 10:53:01.001 * Background saving started by pid 1425
1425:C 06 Jul 10:53:01.001 # Failed opening .rdb for saving: Permission denied
1400:M 06 Jul 10:53:01.102 # Background saving error
1400:M 06 Jul 10:53:07.033 * 10 changes in 300 seconds. Saving...
1400:M 06 Jul 10:53:07.034 * Background saving started by pid 1426
1426:C 06 Jul 10:53:07.034 # Failed opening .rdb for saving: Permission denied
1400:M 06 Jul 10:53:07.135 # Background saving error
1400:M 06 Jul 10:53:13.069 * 10 changes in 300 seconds. Saving...
1400:M 06 Jul 10:53:13.070 * Background saving started by pid 1427
1427:C 06 Jul 10:53:13.070 # Failed opening .rdb for saving: Permission denied
1400:M 06 Jul 10:53:13.175 # Background saving error
1400:M 06 Jul 10:53:19.086 * 10 changes in 300 seconds. Saving...
1400:M 06 Jul 10:53:19.087 * Background saving started by pid 1428
1428:C 06 Jul 10:53:19.087 # Failed opening .rdb for saving: Permission denied
1400:M 06 Jul 10:53:19.191 # Background saving error
1400:M 06 Jul 10:53:25.094 * 10 changes in 300 seconds. Saving...
1400:M 06 Jul 10:53:25.095 * Background saving started by pid 1429
1429:C 06 Jul 10:53:25.095 # Failed opening .rdb for saving: Permission denied
1400:M 06 Jul 10:53:25.196 # Background saving error
1400:M 06 Jul 10:53:31.085 * 10 changes in 300 seconds. Saving...
1400:M 06 Jul 10:53:31.086 * Background saving started by pid 1430
1430:C 06 Jul 10:53:31.086 # Failed opening .rdb for saving: Permission denied
1400:M 06 Jul 10:53:31.190 # Background saving error