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mysql启动报错-server pid file could not be found解决
[root@yunhe ~]# service mysql stop
MySQL server PID file could not be found! [失败]
解决方案如下：
首先查看下与mysql有关的进程
[root@yunhe ~]# ps aux |grep mysq*
root 2019 0.0 0.1 6228 1392 ? S 09:22 0:00 /bin/sh /usr/bin/mysqld_safe --datadir=/var/lib/mysql --pid-file=/var/lib/mysql/yunhe.pid
mysql 2115 0.0 2.9 353596 30808 ? Sl 09:22 0:01 /usr/sbin/mysqld --basedir=/usr --datadir=/var/lib/mysql --plugin-dir=/usr/lib/mysql/plugin --user=mysql --log-error=/var/lib/mysql/yunhe.err --pid-file=/var/lib/mysql/yunhe.pid
500 4258 0.0 1.6 83432 17484 ? S 09:35 0:01 gedit /usr/share/mysql/my-medium.cnf
root 5555 0.0 0.0 5936 768 pts/0 S+ 10:04 0:00 grep mysq*
如果看到上面的内容，那说明mysql相关的进程存在，不过资源调度出现了问题（好像卡死），这时用就要把这些卡死的进程都关闭。
[root@yunhe ~]# kill 2019
[root@yunhe ~]# kill 20115
-bash: kill: (20115) - 没有那个进程
[root@yunhe ~]# kill 2115
然后重新启动mysql
[root@yunhe ~]# service mysql start
Starting MySQL... [确定]
[root@yunhe ~]# mysql -u root -p
Enter password:
Welcome to the MySQL monitor. Commands end with ; or /g.
Your MySQL connection id is 1
Server version: 5.6.4-m7 MySQL Community Server (GPL)
Copyright (c) 2000, 2011, Oracle and/or its affiliates. All rights reserved.
Oracle is a registered trademark of Oracle Corporation and/or its
affiliates. Other names may be trademarks of their respective
owners.
Type 'help;' or '/h' for help. Type '/c' to clear the current input statement.
mysql>
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