mysqlterminalsudo

Server quit without running PID file when trying to start MySQL server?

So I created my .bash_profile, opened it in a text editor and added:

export PATH=$PATH:/usr/local/mysql/bin

and then I saved it. Next, I tried running

sudo /usr/local/mysql/support-files/mysql.server start

was told to enter my password (so I did), and then terminal said

Starting MySQL

and then it kept printing dots until it said:

ERROR! The server quit without updating PID file (/usr/local/mysql/data/Nicks-MacBook-Pro.local.pid).

The error logs look like:

2021-01-25T20:50:49.707062Z 0 [System] [MY-010116] [Server] /usr/local/mysql/bin/mysqld (mysqld 8.0.23) starting as process 15092
2021-01-25T20:50:49.710232Z 0 [Warning] [MY-010159] [Server] Setting lower_case_table_names=2 because file system for /usr/local/mysql/data/ is case insensitive
2021-01-25T20:50:49.834599Z 1 [System] [MY-013576] [InnoDB] InnoDB initialization has started.
2021-01-25T20:50:49.943719Z 1 [System] [MY-013577] [InnoDB] InnoDB initialization has ended.
2021-01-25T20:50:50.037810Z 0 [System] [MY-011323] [Server] X Plugin ready for connections. Bind-address: '::' port: 33060, socket: /tmp/mysqlx.sock
2021-01-25T20:50:50.125494Z 0 [Warning] [MY-010068] [Server] CA certificate ca.pem is self signed.
2021-01-25T20:50:50.126128Z 0 [System] [MY-013602] [Server] Channel mysql_main configured to support TLS. Encrypted connections are now supported for this channel.
2021-01-25T20:50:50.151069Z 0 [System] [MY-010931] [Server] /usr/local/mysql/bin/mysqld: ready for connections. Version: '8.0.23'  socket: '/tmp/mysql.sock'  port: 3306  MySQL Community Server - GPL.
~
~
~
~
~
(END)

How do I fix this?

Solution

  • You should try to restart MySQL service after performing each step to check if the error is solved. But first, take a full backup of MySQL data directory /var/lib/mysql/ before you make any changes to MySQL service.

    Check and/or restart MySQL server

    Connect to your server via SSH as root user and restart MySQL manually. Sometimes restarting the MySQL server may fix this issue. You can use either of the following command to restart MySQL server.

    /etc/init.d/mysql restart

    or

    service mysql restart

    Check if MySQL is running

    You need to check whether the MySQL service is already running. If MySQL service is already running, you will have to kill them and start again. Use the following command to check if there is a MySQL service running already.

    ps -aux | grep -i mysql

    If MySQL service is already running, you will get list of MySQL processes with PIDs. The PID is the process ID of the MySQL processes. You will have to kill those processes.

    kill -9 PID

    PID – Process ID of the MySQL process.

    Check MySQL file ownership

    Check the ownership of MySQL data directory /var/lib/mysql/. Use the following command to check ownership of MySQL service

    ll -aF /var/lib/mysql/

    If it’s owner is root, you should change the ownership to MySQL or your user by using the following command.

    chown -R mysql /var/lib/mysql/

    Backup mysql.sock file

    Take a backup of mysql.sock file and remove it. To achieve this, use the following commands:

    cp /var/lib/mysql.sock /var/lib/mysql.sock_bkp

    rm -rf /var/lib/mysql.sock

    Backup MySQL configuration file

    Remove MySQL configuration file /etc/my.cnf or just back it up for now and restart:

    mv /etc/my.cnf /etc/my.cnf.bak

    Remove log file

    Remove the log file named ib_logfile in the MySQL data directory /var/lib/mysql/ or just back it up now and restart the MySQL service. Sometimes MySQL service fails to start when it faces difficulty in updating the log files. The log files will be created automatically once you restart the MySQL service. Use the following command to remove the log files and back it up.

    Change the present working directory to MySQL data directory.

    cd /var/lib/mysql

    Backup and remove the log files by renaming them.

    mv ib_logfile0 ib_logfile0.bak

    mv ib_logfile1 ib_logfile1.bak

    Move the backups to a temporary location.

    mv /var/lib/mysql/ib_logfile* /tmp/folder/

    Check errors

    Find the log files with suffix “.err” in the MySQL data directory /var/lib/mysql/. These files contain the actual error message. You can use any editor or command like cat, less to read the error message from the log files.

    cat /var/lib/mysql/yourservername.err

    In many cases, MySQL will run soon after removing this error files.

    rm -rf /var/lib/mysql/yourservername.err