$ df -h Also, this may be because, somehow the /tmp partition has been cleared and the My SQL server is looking for the PID file there.
So easy-peasy just create a new pid file and restart the server.
If you seeing the error "The server quit without updating PID file" then obviously something recently changed on your environment.
So lets take it step by step: # /etc/init.d/mysql start Starting My SQL..
# mysql_install_db Installing My SQL system tables... OK Issue 2: Inno DB: Error: data file /var/lib/mysql/ibdata1 is of a different size So your did change and innodb_data_file_path is now a different size than before.If you are not the intended recipient, you are notified that any dissemination, distribution or copying of this email is strictly prohibited.If you have received this email in error, please notify us immediately by return email or to and destroy the original message.The server quit without updating the PID file (/var/lib/mysql/localhost.localdomain.pid). Check the error logs that is how and why you will be able to fix it and get it restarted.While yes people do say just move the file and restart the database to by pass this error... Issue 1: "Fatal error: Can't open and lock privilege tables: Table 'mysql.host' doesn't exist." So this is a result of a bad My SQL upgrade, most likely.