By following these steps, you’ll be able to diagnose and determine which actions must be taken to get your MySql.sock file back in working order.

Locating a Missing MySql.sock File

To locate a missing mysql.sock file, use the following procedure:

1. THIS IS THE MOST IMPORTANT STEP! Back up the /var/lib/mysql directory using the following command

   # cp -fr /var/lib/mysql /var/lib/mysql.old

2. Next, check /var/lib/mysql and /tmp for the .sock file (is it in both places?)
3. Use this command to recreate the symbolic link to the .sock file:

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

4. Now check the permissions of the /var/lib/mysql. It should be 0755 and mysql:root. If not:

   # chmod 0755 /var/lib/mysql
# chown mysql:root /var/lib/mysql

5. cat /etc/passwd to make sure that the mysql user is there.
6. Does /var/lib/mysql/mysql/host.MYI exist? If not then:

   # chmod -R 0660 /var/lib/mysql/mysql
# chown -R mysql:mysql /var/lib/mysql/mysql
# /usr/bin/mysql_install_db

7. Now try to force an update:

   # /scripts/mysqlup --force // for cPanel servers only

8. If all else fails, then you may have a corrupted table. Now before you do this, TRIPLE CHECK that you have backed up the /var/lib/mysql directory. It fact, check it 4 times!

   # rm -fr /var/lib/mysql
# rm -f /usr/sbin/mysqld

   Then force another update:

   # /scripts/mysqlup --force

9. Now if all if this did not help, then try:

   # /usr/sbin/mysqld --basedir=/ --datadir=/var/lib/mysql --user=mysql --pid-file=/var/lib/mysql/Server_HostName.pid --skip-locking &

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