首先，环境:ubuntu 14.04,采用apt-get的方式安装的，手动安装可能路径设置稍有区别。
1、安装MySQL后，用命令行首次启动时发现找不到Mysqld.sock文件，提示：
ERROR 2002 (HY000): Can‘t connect to local MySQL server through socket ‘/var/run/mysqld/mysqld.sock‘ (2)，如图：
2、网上的方法很多不实用，这里介绍一种最简单的方法来解决这个问题。
# sudo /etc/init.d/mysql restart
3、弯路：
[email protected]:/# mysql -uroot -p
Enter password:
ERROR 2002 (HY000): Can‘t connect to local MySQL server through socket ‘/var/run/mysqld/mysqld.sock‘ (2)
[email protected]:/opt#
cd /var/run/mysqld/
[email protected]:/var/run/mysqld#
ls
[email protected]:/var/run/mysqld#
里面是空的，缺少了MySQL-client？
[email protected]:/var/run/mysqld#
apt-get install mysql-client
[email protected]:/opt#
cd /var/run/mysqld/
[email protected]:/var/run/mysqld#
ls
还是没东西，换命令启动：
[email protected]:/var/run/mysqld#
service mysqld start
mysqld:
unrecognized service
寻找到问题的根源在：/etc/mysql/my.cnf里
[email protected]:/etc#
cd mysql/
[email protected]:/etc/mysql#
ls
conf.d
debian.cnf debian-start my.cnf
[email protected]:/etc/mysql#
vim my.cnf
这里有有关mysqld.sock的设置，MySQL按照这个默认设置去找时，没有找到。
如果更改这里的路径问题会很麻烦，因此采用下面的办法解决问题：
[email protected]:/#
sudo /etc/init.d/mysql restart
*
Stopping MySQL database server mysqld
[ OK ]
*
Starting MySQL database server mysqld
[ OK ]
*
Checking for tables which need an upgrade, are corrupt or were
not
closed cleanly.
[email protected]:/#
mysql -uroot -p
Enter
password:
Welcome
to the MySQL monitor. Commands end with ; or \g.
Your
MySQL connection id is 43
。。。。。。
Type
‘help;‘ or ‘\h‘ for help. Type ‘\c‘ to clear the current input
statement.
mysql>
OK，解决了。