ps aux |grep mysql

kill所有列出的进程,然后重启

service mysql start

原因有可能是mysqld没启动;service mysqld start。

持续出现此问题有可能是配置文件不对。

修改/usr/my.cnf   (一般是/etc/my.cnf)

[mysqld]
datadir=/usr/local/mysql/data
socket=/var/lib/mysql/mysql.sock

[mysql.server]
user=mysql
basedir=/usr/local/mysql

If there is not currently a section called [client], add one at the bottom of the file and copy the socket= line under the [mysqld] section such as:
[client]
socket=/var/lib/mysql/mysql.sock

其他问题:

1、先查看 /etc/rc.d/init.d/mysqld status 看看m y s q l 是否已经启动.
另外看看是不是权限问题.
2、确定你的mysql.sock是不是在那个位置,
mysql -u 你的mysql用户名 -p -S /var/lib/mysql/mysql.sock
3、如果是权限问题,则先改变权限 #chown -R mysql:mysql /var/lib/mysql
[root@localhost ~]# /etc/init.d/mysqld start
启动 MySQL: [ 确定 ]
[root@localhost ~]# mysql -uroot –p

转:http://www.cnblogs.com/visi_zhangyang/archive/2012/03/05/2380531.html

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