/etc/init.d/mysql start无法启动MySQL错误信息如下：
ERROR! MySQL server PID file could not be found!
Starting MySQL.. ERROR! The server quit without updating PID file (/usr/local/mysql/var/AYXXXXXXXXXXX.pid).
启动会报错Starting MySQL.. ERROR! The server quit without updating PID file (/var/local/mysql/var/AYxxxxxxx.pid)原因是因为 mysql-bin.0000*的文件占满系统盘，磁盘空间不足导致无法写入。
解决方法：
1：删除所有mysql-bin.0000*日志文件全部rm掉
2：修改在my.cnf 文件，找到 log-bin=mysql-bin 将其启注释掉，以后就不会产生2进制的mysql-bin.0000*的日志文件