问题来源：在删除var目录下的log文件时，将redis文件夹删除了。然后在重启时：/etc/init.d/redis-server start，提示：
Starting redis-server:
*** FATAL CONFIG FILE ERROR ***
Reading the configuration file,at line 94
>>> 'logfile /var/log/redis/redis-server.log'
Can't open the log file: No such file or directory
Starting redis-server:
*** FATAL CONFIG FILE ERROR ***
Reading the configuration file,at line 94
>>> 'logfile /var/log/redis/redis-server.log'
Can't open the log file: Permission denied
Failed
*** FATAL CONFIG FILE ERROR ***
Reading the configuration file,at line 94
>>> 'logfile /var/log/redis/redis-server.log'
Can't open the log file: Permission denied
Failed
查了一下，最终发现有可能是权限不够的问题，于是，ls -l /var/log/redis/redis-server.log
提示：-rw-r--r-- 1 root root 0 6月 2 10:05 /var/log/redis/redis-server.log。如下图所示：
解决办法：
chmod 777 /var/log/redis/redis-server.log
