MariaDB mysql configuration example for Ubuntu 18.04 LTS (Bionic Beaver)

Get the default configuration file mysql for MariaDB, optimized for Ubuntu 18.04 LTS (Bionic Beaver). This example configuration ensures optimal compatibility and performance for MariaDB, 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 $named $time
# Should-Stop:       $network $named $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 MariaDB 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/sbin/mysqld || exit 0

. /lib/lsb/init-functions

SELF=$(cd $(dirname $0); pwd -P)/$(basename $0)

MYADMIN="/usr/bin/mysqladmin --defaults-file=/etc/mysql/debian.cnf"

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

if [ -f /etc/default/mysql ]; then
  . /etc/default/mysql
fi

# Also source default/mariadb in case the installation was upgraded from
# packages originally installed from MariaDB.org repositories, which have
# had support for reading /etc/default/mariadb since March 2016.
if [ -f /etc/default/mariadb ]; then
  . /etc/default/mariadb
fi

# 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 MariaDB 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 MariaDB!
    /usr/bin/mysqld_safe "${@:2}" 2>&1 >/dev/null | $ERR_LOGGER &

    for i in $(seq 1 "${MYSQLD_STARTUP_TIMEOUT:-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=$(/etc/mysql/debian-start)
      if [ -n "$output" ]; then
        log_action_msg "$output"
      fi
    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 MariaDB 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: $shutdown_out"
      log_daemon_msg "Killing MariaDB database server by signal" "mysqld"
      killall -15 mysqld
      server_down=
      for i in `seq 1 600`; do
        sleep 1
        if mysqld_status check_dead nowarn; then server_down=1; break; fi
      done
      if test -z "$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 MariaDB manually and read /usr/share/doc/mariadb-server-10.1/README.Debian.gz!"
    exit -1
  else
    log_end_msg 0
  fi
  ;;

  'restart')
  set +e; $SELF stop; set -e
  shift
  $SELF start "${@}"
  ;;

  'reload'|'force-reload')
  log_daemon_msg "Reloading MariaDB 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 "MariaDB is stopped."
    exit 3
  fi
  ;;

  'bootstrap')
	# Bootstrap the cluster, start the first node
	# that initiates the cluster
	log_daemon_msg "Bootstrapping the cluster" "mysqld"
	$SELF start "${@:2}" --wsrep-new-cluster
	;;

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

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