启动Mysql5.5时提示如下错误：

Starting MySQL.. ERROR! The server quit without updating PID file (/var/lib/mysql/MyCloudServer.pid).

打开/var/log/mysqld.log日志目录查看日志,错误如下：

[root@MyCloudServer ~]# cat /var/log/mysqld.log 
150703 13:45:11 mysqld_safe Starting mysqld daemon with databases from /var/lib/mysql
/usr/sbin/mysqld: error while loading shared libraries: libaio.so.1: cannot open shared object file: No such file or directory
150703 13:45:11 mysqld_safe mysqld from pid file /var/lib/mysql/MyCloudServer.pid ended

安装好mysql发现无法启动查看日志，提示:加载共享库时出错xxxxxxxxxxxx 缺少libaio

安装libaio

yum install libaio

启动再次出现如下错误：

InnoDB: Foreign key constraint system tables created
150703 13:48:26 InnoDB: Waiting for the background threads to start
150703 13:48:27 InnoDB: 5.5.30 started; log sequence number 0
150703 13:48:27 [Note] Server hostname (bind-address): '0.0.0.0'; port: 3306
150703 13:48:27 [Note] - '0.0.0.0' resolves to '0.0.0.0';
150703 13:48:27 [Note] Server socket created on IP: '0.0.0.0'.
150703 13:48:27 [ERROR] Fatal error: Can't open and lock privilege tables: Table 'mysql.host' doesn't exist
150703 13:48:27 mysqld_safe mysqld from pid file /var/lib/mysql/MyCloudServer.pid ended

初始化数据库

mysql_install_db

初始化数据库后启动发现已经可以启动，同时我们也不要忘记了df -h看看是不是根目录占用100%了或数据盘。

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