启动mysql 报错：

ERROR 2002 (HY000): Can’t connect to local MySQL server through socket ‘/var/lib/mysql/mysql.sock’ (2)

这里收集罗列几种解决方案：

1、先查看 /etc/rc.d/init.d/mysqld status 看看mysql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、试试：service mysqld start （我通过这个弄好了。。）

4、如果是权限问题，则先改变权限

[root@localhost ~]# /etc/init.d/mysqld start
启动 MySQL： [ 确定 ]
[root@localhost ~]# mysql -u root -p
ERROR 2002 (HY000): Can't connect to local MySQL server through socket '/var/lib/mysql/mysql.sock' (2)

改变权限

shell> chown -R mysql:mysql /var/lib/mysql

接着启动服务器

shell> /etc/init.d/mysql start

服务器正常启动后察看 /var/lib/mysql 自动生成mysql.sock文件。

5.如果仍然没有得到解决 修改/etc/my.conf:

[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

6.运行/etc/init.d/mysql start报错：Starting MySQLCouldn't find MySQL manager or server

是mysqld服务没启，运行

/usr/local/mysql/bin/mysqld_safe &

7.新建 /tmp或者 重启

chmod a+rwx,o+t /tmp

8.可能是磁盘满了
可以参照这篇文章的指令去查询
https://blog.csdn.net/xingjia001/article/details/77453640

附：執行 PHP 时出现这样的错误信息：

Warning: MySQL Connection Failed: Can't connect to local MySQL server through socket '/tmp/mysql.sock' (111) in /home/httpd/html/show.php on line 9

请将 /tmp/mysql.sock link 到 /var/lib/mysql 目录里即可：

linux# ln -s /var/lib/mysql/mysql.sock /tmp/mysql.sock