MySQL mysql configuration example for Ubuntu 20.04 LTS (Focal Fossa)

Get the default configuration file mysql for MySQL, optimized for Ubuntu 20.04 LTS (Focal Fossa). This example configuration ensures optimal compatibility and performance for MySQL, making it easy to set up and adjust to meet your needs.

Find and download the configuration file here: /etc/init.d/mysql.

For more configurations and setup guides, visit our related files section to further customize your system.

    #!/bin/bash
#
### BEGIN INIT INFO
# Provides:          mysql
# Required-Start:    $remote_fs $syslog
# Required-Stop:     $remote_fs $syslog
# Should-Start:      $network $time
# Should-Stop:       $network $time
# Default-Start:     2 3 4 5
# Default-Stop:      0 1 6
# Short-Description: Start and stop the mysql database server daemon
# Description:       Controls the main MySQL database server daemon "mysqld"
#                    and its wrapper script "mysqld_safe".
### END INIT INFO
#
set -e
set -u
${DEBIAN_SCRIPT_DEBUG:+ set -v -x}

test -x /usr/bin/mysqld_safe || exit 0

. /lib/lsb/init-functions

SELF=$(cd $(dirname $0); pwd -P)/$(basename $0)
CONF=/etc/mysql/my.cnf
MYADMIN="/usr/bin/mysqladmin --defaults-file=/etc/mysql/debian.cnf"

# priority can be overriden and "-s" adds output to stderr
ERR_LOGGER="logger -p daemon.err -t /etc/init.d/mysql -i"

# Safeguard (relative paths, core dumps..)
cd /
umask 077

# mysqladmin likes to read /root/.my.cnf. This is usually not what I want
# as many admins e.g. only store a password without a username there and
# so break my scripts.
export HOME=/etc/mysql/

## Fetch a particular option from mysql's invocation.
#
# Usage: void mysqld_get_param option
mysqld_get_param() {
	/usr/sbin/mysqld --print-defaults \
		| tr " " "\n" \
		| grep -- "--$1" \
		| tail -n 1 \
		| cut -d= -f2
}

## Do some sanity checks before even trying to start mysqld.
sanity_checks() {
  # check for config file
  if [ ! -r /etc/mysql/my.cnf ]; then
    log_warning_msg "$0: WARNING: /etc/mysql/my.cnf cannot be read. See README.Debian.gz"
    echo                "WARNING: /etc/mysql/my.cnf cannot be read. See README.Debian.gz" | $ERR_LOGGER
  fi

  # check for diskspace shortage
  datadir=`mysqld_get_param datadir`
  if LC_ALL=C BLOCKSIZE= df --portability $datadir/. | tail -n 1 | awk '{ exit ($4>4096) }'; then
    log_failure_msg "$0: ERROR: The partition with $datadir is too full!"
    echo                "ERROR: The partition with $datadir is too full!" | $ERR_LOGGER
    exit 1
  fi
}

## Checks if there is a server running and if so if it is accessible.
#
# check_alive insists on a pingable server
# check_dead also fails if there is a lost mysqld in the process list
#
# Usage: boolean mysqld_status [check_alive|check_dead] [warn|nowarn]
mysqld_status () {
    ping_output=`$MYADMIN ping 2>&1`; ping_alive=$(( ! $? ))

    ps_alive=0
    pidfile=`mysqld_get_param pid-file`
    if [ -f "$pidfile" ] && ps `cat $pidfile` >/dev/null 2>&1; then ps_alive=1; fi
    
    if [ "$1" = "check_alive"  -a  $ping_alive = 1 ] ||
       [ "$1" = "check_dead"   -a  $ping_alive = 0  -a  $ps_alive = 0 ]; then
	return 0 # EXIT_SUCCESS
    else
  	if [ "$2" = "warn" ]; then
  	    echo -e "$ps_alive processes alive and '$MYADMIN ping' resulted in\n$ping_output\n" | $ERR_LOGGER -p daemon.debug
	fi
  	return 1 # EXIT_FAILURE
    fi
}

#
# main()
#

case "${1:-''}" in
  'start')
	sanity_checks;
	# Start daemon
	log_daemon_msg "Starting MySQL database server" "mysqld"
	if mysqld_status check_alive nowarn; then
	   log_progress_msg "already running"
	   log_end_msg 0
	else
	    # Could be removed during boot
	    test -e /var/run/mysqld || install -m 755 -o mysql -g root -d /var/run/mysqld

	    # Start MySQL! 
  	    su - mysql -s /bin/sh -c "/usr/bin/mysqld_safe > /dev/null 2>&1 &"

	    # 6s was reported in #352070 to be too few when using ndbcluster
	    # 14s was reported in #736452 to be too few with large installs
	    for i in $(seq 1 30); do
                sleep 1
	        if mysqld_status check_alive nowarn ; then break; fi
		log_progress_msg "."
	    done
	    if mysqld_status check_alive warn; then
                log_end_msg 0
	        # Now start mysqlcheck or whatever the admin wants.
	        output=$(/etc/mysql/debian-start)
		[ -n "$output" ] && log_action_msg "$output"
	    else
	        log_end_msg 1
		log_failure_msg "Please take a look at the syslog"
	    fi
	fi
	;;

  'stop')
	# * As a passwordless mysqladmin (e.g. via ~/.my.cnf) must be possible
	# at least for cron, we can rely on it here, too. (although we have 
	# to specify it explicit as e.g. sudo environments points to the normal
	# users home and not /root)
	log_daemon_msg "Stopping MySQL database server" "mysqld"
	if ! mysqld_status check_dead nowarn; then
	  set +e
	  shutdown_out=`$MYADMIN shutdown 2>&1`; r=$?
	  set -e
	  if [ "$r" -ne 0 ]; then
	    log_end_msg 1
	    [ "$VERBOSE" != "no" ] && log_failure_msg "Error: $shutdown_out"
	    log_daemon_msg "Killing MySQL database server by signal" "mysqld"
	    killall -15 mysqld
            server_down=
	    for i in 1 2 3 4 5 6 7 8 9 10; do
              sleep 1
              if mysqld_status check_dead nowarn; then server_down=1; break; fi
            done
          if test -z "$server_down"; then killall -9 mysqld; fi
	  fi
        fi

        if ! mysqld_status check_dead warn; then
	  log_end_msg 1
	  log_failure_msg "Please stop MySQL manually and read /usr/share/doc/mysql-server-5.7/README.Debian.gz!"
	  exit -1
	else
	  log_end_msg 0
        fi
	;;

  'restart')
	set +e; $SELF stop; set -e
	$SELF start 
	;;

  'reload'|'force-reload')
  	log_daemon_msg "Reloading MySQL database server" "mysqld"
	$MYADMIN reload
	log_end_msg 0
	;;

  'status')
	if mysqld_status check_alive nowarn; then
	  log_action_msg "$($MYADMIN version)"
	else
	  log_action_msg "MySQL is stopped."
	  exit 3
	fi
  	;;

  *)
	echo "Usage: $SELF start|stop|restart|reload|force-reload|status"
	exit 1
	;;
esac

# Some success paths end up returning non-zero so exit 0 explicitly. See
# bug #739846.
exit 0

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