转自： http://icesquare.com/wordpress/mysql-starting-mysql-error-the-server-quit-without-updating-pid-file/

他也是更新系统后出现的这个问题，我是更新之后出现的该问题，所以按照他的思路删掉配置文件就可以启动了，至于为什么会出现这种问题，回头有时间再仔细研究下。

This step-by-step guide is mainly for FreeBSD, however the idea is the same for Linux. Every once a while, when I update my FreeBSD box, the system likes to shutdown my MySQL server. Therefore, I need to start it again after the update is done. Unfortunately, the upgrade process is not smooth every time. Sometimes it will throw me some error.

/usr/local/etc/rc.d/mysql.server start 

Oh well, I got the following error messages:

Starting MySQL..... ERROR! The server quit without updating PID file. 

Sometimes, the message will tell you the exact location of which PID file:

Starting MySQL..... ERROR! The server quit without updating PID file (/var/db/mysql/www.icesquare.com.pid). 

There are several solutions to troubleshoot these problems. I will go over each one by one.

Solution 1: Reboot The Computer

Solution 2: Remove Your MySQL Config File

If you have modified your MySQL configuration file, MySQL may not like it few versions after (MySQL is not backward compatibility friendly). It can be the problem of using an unsupported variable, or something similar. The easiest way is to remove your configuration file, and try to start the MySQL server again:

Backup your MySQL configuration first.

mv /etc/my.cnf /etc/my.cnf.backup 

And restart the MySQL server again:

/usr/local/share/mysql/mysql.server start 

Hopefully you will see the following message:

Starting MySQL. SUCCESS! 

Solution 3: Upgrade Your Database File

Sometimes, the newer MySQL doesn’t like the database created in earlier version. I discovered this when I upgrade to MySQL 5.5.7:

Starting MySQL..... ERROR! The server quit without updating PID file (/var/db/mysql/www.icesquare.com.pid). 

Since MySQL tells me which PID file causes the problem, I open the file and take a look what’s going on:

sudo tail /var/db/mysql/www.icesquare.com.err 

And I saw something interesting: tables: Table ‘mysql.proxies_priv’ doesn’t exist:

101112 10:49:16  InnoDB: Initializing buffer pool, size = 128.0M 101112 10:49:16  InnoDB: Completed initialization of buffer pool 101112 10:49:16  InnoDB: highest supported file format is Barracuda. 101112 10:49:17  InnoDB: 1.1.3 started; log sequence number 1589404 101112 10:49:17 [ERROR] Fatal error: Can't open and lock privilege tables: Table 'mysql.proxies_priv' doesn't exist 101112 10:49:17 mysqld_safe mysqld from pid file /var/db/mysql/www.icesquare.com.pid ended 

The reason is very simple. MySQL could not open a table created in the earlier version (< 5.7.7) because it is not compatible with the current version. So, we can try to start the MySQL in safe mode through rc.d. First, you can edit the /etc/rc.conf and put the following into the file:

mysql_enable="YES" mysql_args="--skip-grant-tables --skip-networking" 

Restart MySQL through rc.d:

/usr/local/etc/rc.d/mysql-server start 

If you did it right, you should see something like the following:

Starting MySQL.. SUCCESS! 

Now, MySQL is already running the safe-mode. We want to perform a MySQL upgrade on all tables:

sudo mysql_upgrade 

You should see something like this:

Looking for 'mysql' as: mysql Looking for 'mysqlcheck' as: mysqlcheck Running 'mysqlcheck' with connection arguments: '--port=3306' '--socket=/tmp/mysql.sock' Running 'mysqlcheck' with connection arguments: '--port=3306' '--socket=/tmp/mysql.sock' mysql.columns_priv                                 OK mysql.db                                           OK mysql.event                                        OK mysql.func                                         OK mysql.general_log                                  OK mysql.help_category                                OK mysql.help_keyword                                 OK mysql.help_relation                                OK mysql.help_topic                                   OK mysql.host                                         OK mysql.ndb_binlog_index                             OK mysql.plugin                                       OK mysql.proc                                         OK mysql.procs_priv                                   OK mysql.servers                                      OK mysql.slow_log                                     OK mysql.tables_priv                                  OK mysql.time_zone                                    OK mysql.time_zone_leap_second                        OK mysql.time_zone_name                               OK mysql.time_zone_transition                         OK mysql.time_zone_transition_type                    OK mysql.user                                         OK Running 'mysql_fix_privilege_tables'... OK 

Now, we want to switch the MySQL back to normal mode by commenting the extra options in /etc/rc.conf:

mysql_enable="YES" #mysql_args="--skip-grant-tables --skip-networking" 

And restart MySQL through /etc/rc.d:

/usr/local/etc/rc.d/mysql-server restart 

Now the MySQL is up and running again!

Happy MySQLing.

–Derrick