用redis-cli 创建 set时，提示无法修改数据
(error) MISCONF Redis is configured to save RDB snapshots, but is currently not able to persist on disk. Commands that may modify the data set are disabled. Please check Redis logs for details about the error.
3930:M 13 Dec 22:48:20.115 # Background saving error 3930:M 13 Dec 22:48:26.025 * 1 changes in 900 seconds. Saving... 3930:M 13 Dec 22:48:26.025 * Background saving started by pid 11584 11584:C 13 Dec 22:48:26.025 # Failed opening the RDB file root (in server root dir /etc/cron.d) for saving: Permission denied
WARNING overcommit_memory is set to 0! Background save may fail under low memory condition. To fix this issue add 'vm.overcommit_memory = 1' to /etc/sysctl.conf and then reboot or run the command 'sysctl vm.overcommit_memory=1' for this to take effect.