MySQL cannot use MySQL - U root - P to start error reporting and solve it

Today, I installed it on the cloud some time before logging in mysql when , Use mysql -u root -p The command keeps reporting errors "ERROR 2002 (HY000): Can't connect to local MySQL server through socket '/var/lib/mysql/mysql.sock' (2)"
All kinds of information , Some say will mysql Restart can solve , So direct "service mysql restart ", However, the problem is not solved when logging in .
Finally find an article , It said it was in /var/lib/mysql/mysql.sock I can't find it here mysql.sock, To /etc/my.cnf Zhongyi

socket When configuring the pointing of /tmp/mysql.sock, To /tmp Sure enough, I found mysql.sock, So the solution is ：
To /var/lib/mysql/ Under the table of contents
linux ln -s /tmp/mysql.sock .
Reuse mysql -u root -p Sign in , have already been solved

 stay  mysql -u root -p  When unable to log in , You can also use mysql -uroot -h 127.0.0.1 -p, Sign in 

The problems encountered today are recorded here , Ready for later use