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Can't connect to MySQL using 'localhost' but using '' [SOLVED]

Sometimes it happens that MYSQL doesn't connect while using host = localhost while works fine while we connect it using I fell into this issue and found the following solutions for this issue:

Opinion 1
You can check permission like this :
[learner@localhost ~]$ sudo netstat -npa | grep mysqld
tcp 0 0* LISTEN 6284/mysqld
unix 2 [ ACC ] STREAM LISTENING 233040 6284/mysqld /var/lib/mysql/mysql.sock
If this is listening on 0* it means that every one can access that mysql.
you can edit binding for this in my.conf file. In linux default path for this is :
[learner@localhost ~]$ sudo vi /etc/my.cnf
Add these lines in my.conf file for allowing ip that you want.
bind-address =
bind-address =
Opinion 2
You need a mysql.sock in /tmp
ln -s /var/lib/mysql/mysql.sock mysql.sock
should work fine after that.
Opinion 3
For me, changing the permissions to be publically readable on the parent directory of the mysql.sock fixed the issue:
chmod 755 /var/lib/mysql
Just add a line in /etc/my.cnf and restart mysql to let it work.
bind-address = localhost

and it started to work!!!!!!