我在自己的mac笔记本上装了一个docker，并在docker容器中安装了lnmp环境，经常会遇到在使用"lnmp restart"命令启动lnmp服务的时候，mysql服务启动失败，启动日志：
Stoping LNMP... Stoping nginx... nginx is not running. ERROR! MySQL server PID file could not be found! Gracefully shutting down php-fpm /etc/init.d/php-fpm: line 82: kill: (695) - No such process ................................... failed. Use force-quit Starting LNMP... Starting nginx... done Starting MySQL... ERROR! The server quit without updating PID file (/usr/local/mysql/var/37815a453e3e.pid). Starting php-fpm done
找到mysql的数据存放目录，我的是/usr/local/mysql/var目录下(这个目录可以通过/etc/my.cnf中的innodb_data_home_dir属性查看)，找到以.err结尾对文件，根据日期查看最近对err文件：
[root@37815a453e3e bin]# cd /usr/local/mysql/var [root@37815a453e3e var]# ll total 141556 -rw-r----- 1 mysql mysql 27407 Sep 30 16:29 124dc886567c.err -rw-r----- 1 mysql mysql 6924 Sep 30 12:55 22415a597457.err -rw-r----- 1 mysql mysql 20626 Oct 1 17:02 37815a453e3e.err -rw-r----- 1 mysql mysql 41418 Sep 30 11:05 7f92c9fbcaea.err -rw-r----- 1 mysql mysql 36378 Sep 29 13:42 f25f067a6a86.err
发现错误日中有如下错误信息：
2018-10-01T14:05:29.741954Z 0 [Warning] Insecure configuration for --pid-file:
Location '/usr/local/mysql/var' in the path is accessible to all OS users.
Consider choosing a different directory. 2018-10-01T14:05:29.744299Z 0 [ERROR] Fatal error: Can't open and lock privilege tables:
Table storage engine for 'proxies_priv' doesn't have this option 2018-10-01T14:05:29.744399Z 0 [ERROR] Aborting
解决办法，对数据目录授权：
[root@6e1de98da6d4 var]# chown -R mysql:mysql /usr/local/mysql/var/ [root@6e1de98da6d4 var]# lnmp mysql restart +-------------------------------------------+ | Manager for LNMP, Written by Licess | +-------------------------------------------+ | https://lnmp.org | +-------------------------------------------+ ERROR! MySQL server PID file could not be found! Starting MySQL. SUCCESS! [root@6e1de98da6d4 var]#
重启mysql服务，启动OK：
[root@37815a453e3e var]# lnmp mysql restart +-------------------------------------------+ | Manager for LNMP, Written by Licess | +-------------------------------------------+ | https://lnmp.org | +-------------------------------------------+ Shutting down MySQL.. SUCCESS! Starting MySQL. SUCCESS!