Common MySQL Errors

Error: Can’t connect to local MySQL server through socket ‘/var/run/mysqld/mysqld.sock’ (2)


mkdir -p /var/run/mysqld
touch /var/run/mysqld/mysqld.sock
chmod 777 /var/run/mysqld/mysqld.sock
chown mysql:mysql /var/run/mysqld
service mysql restart

See if a socket file exists. To find all socket files on your system run:

sudo find / -type s

Mysql server is usually open at /var/lib/mysql/mysql.sock

The MySQl configuration file is usually at /etc/mysql/my.cnf (Ubuntu 17.04)

stop MySQL

sudo service mysqld stop

Look for a .pid file and delete it if found

ls -alh /var/run/mysqld/

create a new .sock file and chmod it

touch /var/run/mysqld/mysqld.sock
chmod 777 /var/run/mysqld/mysqld.sock

also set mysql as the owner of /var/run/mysqld

chown mysql:mysql /var/run/mysqld

start MySQL again

sudo service mysql restart

Failed! Error: The MySQL server is running with the –skip-grant-tables option so it cannot execute this statement

Login to MySQL




mysqld_safe Directory ‘/var/run/mysqld’ for UNIX socket file don’t exists.

if you get while trying to start MySQL in safe mode

mysqld_safe Directory '/var/run/mysqld' for UNIX socket file don't exists.

then make the directory

mkdir -p /var/run/mysqld
chown mysql:mysql /var/run/mysqld

and re-run the command to start MySQL in safe mode.

ERROR 1146 (42S02): Table ‘mysql.USER’ doesn’t exist

Your database may be corrupt. See if mysql.user exits

USE mysql;

If these are missing you can try recreating the tables by running


(I got this error because i had set a 100 character long generated password while installing MySQL, and it wasn’t valid. The installation proceeded without giving an error. But checking the mysql.user table showed *THISISNOTAVALIDPASSWORDTHATCANBEUSEDHERE. Since mine was a fresh installation, i just removed and reinstalled MySQL apt-get remove -y mysql-* && apt-get purge -y mysql-*)

ERROR 2003 (HY000): Can’t connect to MySQL server on ‘’ (111)

See if the server you’re trying to connect to allows connection. One common scenario is where your remote server is bound to localhost. You can find out with the following command (where 3306 is the default MySQL port) run this on the server you want to connect to

netstat -nat | grep :3306
tcp        0      0*               LISTEN

If you see a localhost ( or 192.168.x.x etc.) than the server is binding to localhost and not allowing any remote connections. To resolve this, uncomment the following line in /etc/mysql/mysql.conf.d/mysqld.cnf

#bind-address =

Check netstat again, you should see or just :

# netstat -nat | grep :3306
tcp6       0      0 :::3306                 :::*                    LISTEN

ERROR 1819 (HY000): Your password does not satisfy the current policy requirements

The solution is to turn off password validation

mysql -h localhost -u root -p
uninstall plugin validate_password;

Or you could set the policy to LOW in the mysql conf file: /etc/mysql/mysql.conf.d/mysqld.cnf

# 0: LOW