percona-xtradb-cluster-server-5.7 5.7.20-29.24-0ubuntu2 / etc / init.d / mysql

#!/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 (Percona XtraDB Cluster) daemon
# Description:       Controls the main MySQL (Percona XtraDB Cluster) daemon "mysqld"
#                    and its wrapper script "mysqld_safe".
### END INIT INFO
#
set -e
set -u

# source the defauts file /etc/default/mysql if it exists for any environment variables.
# set -a is done so that  'FOO=BAR' just be used than 'export FOO=BAR' in the /etc/default/mysql.
# However, export FOO=BAR in that file also should work.
set -a
[ -r /etc/default/mysql ] && . /etc/default/mysql
set +a


${DEBIAN_SCRIPT_DEBUG:+ set -v -x}
PERCONA_PREFIX=/usr
startup_timeout=900
stop_timeout=300
startup_sleep=1

test -x "${PERCONA_PREFIX}"/sbin/mysqld || exit 0

. /lib/lsb/init-functions

SELF=$(cd $(dirname $0); pwd -P)/$(basename $0)
CONF=/etc/mysql/my.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() {
	"${PERCONA_PREFIX}"/sbin/mysqld --print-defaults \
                | tr " " "\n" | awk -F= '{if ($1 ~ /_/) { gsub(/_/,"-",$1); print $1"="$2 } else { print $0 }}' \
		| grep -- "--$1=" \
		| tail -n 1 \
		| cut -d= -f2
}

## Do some sanity checks before even trying to start mysqld.
sanity_checks() {
  # check for config file
  # DISABLED: We do not install my.cnf
  #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

  if test -e $sst_progress_file;then 
	log_daemon_msg "Stale sst_in_progress file in datadir" "mysqld"
  fi
}

# Get the pid file
mysql_data_dir=$(mysqld_get_param datadir)
[ ! $mysql_data_dir ] && mysql_data_dir="/var/lib/percona-xtradb-cluster"

pid_file=$(mysqld_get_param pid-file)

if test -z "$pid_file"
then
    pid_file="$mysql_data_dir/$(hostname).pid"
else
  case "$pid_file" in
    /* ) ;;
    * )  pid_file="$mysql_data_dir/$pid_file" ;;
  esac
fi

sst_progress_file=$mysql_data_dir/sst_in_progress
## Checks if there is a server running and if so if it is accessible.
#
# check_alive insists on a pingable server
# check_dead also fails if there is a lost mysqld in the process list
#
# Usage: boolean mysqld_status [check_alive|check_dead] [warn|nowarn]
mysqld_status () {
    mysqld_pid=$(cat $pid_file 2>/dev/null)

    if [ ! $mysqld_pid ];then 
        echo "MySQL PID not found, pid_file detected/guessed: $pid_file" | $ERR_LOGGER
        if [ "$1" = "check_dead" ]; then
            return 0
        fi
        return 1
    fi

    ping_alive=1
    ps_alive=0
    
    if ! mysqladmin ping &>/dev/null;then
        ping_alive=0
    fi
    
    /bin/kill -0 $mysqld_pid &>/dev/null && ps_alive=1
    
    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
  	    warn_msg=
	    [ $ping_alive = 0 ] && warn_msg+="mysql ping failed"
  	    [ $ps_alive = 0 ] && \
  	        warn_msg+=" and/or mysqld with pid $mysqld_pid is not alive"
  	    echo -e "$warn_msg" | $ERR_LOGGER -p daemon.debug
	fi
  	return 1 # EXIT_FAILURE
    fi
}

log_startup_failure() {
    local msg="$@"
    if test -e $sst_progress_file;then 
        msg+=" However, State transfer is still in progress. Please check if mysqld is running."
    fi
    log_failure_msg "$msg"
}
#
# main()
#

case "${1:-''}" in
  'start')
	sanity_checks;
	# Start daemon
	log_daemon_msg "Starting MySQL (Percona XtraDB Cluster) database server" "mysqld"
	if mysqld_status check_alive nowarn; then
	   log_progress_msg "already running"
	   log_end_msg 0
	else
           if [[ -r $pid_file ]]; then
               log_warning_msg "Stale PID file found: $pid_file with $(cat $pid_file)"
           fi
           extra_args="${2:-}"
           if [[ -z "$extra_args" ]]; then
               "${PERCONA_PREFIX}"/bin/mysqld_safe > /dev/null 2>&1 &
           else
               "${PERCONA_PREFIX}"/bin/mysqld_safe $extra_args > /dev/null 2>&1 &
           fi
           safe_pid=$!
           avoid_race_condition="by checking again"

	    for i in `seq 1 $startup_timeout`; do

                if test -e $sst_progress_file && [ $startup_sleep -ne 10 ];then
                    log_daemon_msg "State transfer in progress, setting sleep higher" "mysqld"
                    startup_sleep=10
                fi
                # if server isn't running, then pid-file will never be updated
                if test -n "$safe_pid"; then
                    if kill -0 "$safe_pid" 2>/dev/null; then
                        set +e 
                        test -s $pid_file && kill -0 $(cat $pid_file) 2>/dev/null && break
                        set -e
                    else
                        # The server may have exited between the last pid-file check and now.  
                        if test -n "$avoid_race_condition"; then
                            avoid_race_condition=""
                            continue  # Check again.
                        fi

                        log_failure_msg "The server quit without updating PID file ($pid_file)."
                        log_end_msg 1
                        exit 1  # not waiting any more.
                    fi
                fi
                sleep $startup_sleep
		log_progress_msg "."
	    done
	    sleep 1
	    if mysqld_status check_alive warn; then
                log_end_msg 0
            else
                log_startup_failure "Please take a look at the syslog."
                log_end_msg 1
	    fi
	fi
	;;

  'stop'|'bootstrap-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 (Percona XtraDB Cluster)" "mysqld"
	if ! mysqld_status check_dead nowarn; then
	  set +e
	  shutdown_out=`kill $mysqld_pid 2>&1`; r=$?
	  set -e
	  if [ "$r" -ne 0 ]; then
	    log_end_msg 1
	    log_daemon_msg "MySQLd already dead" "mysqld"
	  else
            server_down=
	    for i in `seq 1 $stop_timeout`; do
              sleep 1
              if mysqld_status check_dead nowarn; then server_down=1; break; fi
            done
            #Better to not kill in cases of large buffer pools
            #if test -z "$server_down"; then 
                #kill -9 $mysqld_pid 
            #fi
	  fi
        fi

        if ! mysqld_status check_dead warn; then
	  log_end_msg 1
	  log_failure_msg "Please stop MySQL (Percona XtraDB Cluster) manually and \
	      read /usr/share/doc/percona-xtradb-cluster-server-5.7/README.Debian.gz!"
	  exit -1
	else
	  log_end_msg 0
        fi
	;;

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

  'restart-bootstrap')
	set +e; $SELF stop; set -e
	$SELF bootstrap-pxc 
	;;

  'reload'|'force-reload'|'reload-bootstrap')
  	log_daemon_msg "Reloading MySQL (Percona XtraDB Cluster)" "mysqld"
        mysqld_pid=$(cat $pid_file 2>/dev/null)

        if [ ! $mysqld_pid ];then 
            log_failure_msg "MySQL PID not found, pid_file detected/guessed: $pid_file"
            log_end_msg 1
            exit 4
        fi

  	if kill -HUP $mysqld_pid 2>/dev/null;then 
  	    log_daemon_msg "Percona XtraDB Cluster reload complete" "mysqld"
	log_end_msg 0
  	else
            log_failure_msg "Percona XtraDB Cluster with PID $mysqld_pid \
                            is not running or unknown error"
            log_end_msg 1
        fi
	;;

  'status'|'status-bootstrap')
	if mysqld_status check_alive nowarn; then
	  log_action_msg "Percona XtraDB Cluster up and running"
	else
	  log_action_msg "MySQL (Percona XtraDB Cluster) is stopped. Check log"
	  exit 3
	fi
  	;;
  'bootstrap-pxc')
        startup_sleep=10
	sanity_checks;
	# Start daemon
	log_daemon_msg "Bootstrapping Percona XtraDB Cluster database server" "mysqld"
	if mysqld_status check_alive nowarn; then
	   log_progress_msg "already running"
	   log_end_msg 0
	else
	    if [[ -r $pid_file ]];then 
                log_warning_msg "Stale PID file found: $pid_file with $(cat $pid_file)"
            fi
             "${PERCONA_PREFIX}"/bin/mysqld_safe --wsrep-new-cluster > /dev/null 2>&1 &
  	    safe_pid=$!
            avoid_race_condition="by checking again"

	    for i in `seq 1 $startup_timeout`; do

                if test -e $sst_progress_file && [ $startup_sleep -ne 10 ];then
                    log_daemon_msg "State transfer in progress, setting sleep higher" "mysqld"
                    startup_sleep=10
                fi
                # if server isn't running, then pid-file will never be updated
                if test -n "$safe_pid"; then
                    if kill -0 "$safe_pid" 2>/dev/null; then
                        set +e
                        test -s $pid_file && kill -0 $(cat $pid_file) 2>/dev/null && break
                        set -e
                    else
                        # The server may have exited between the last pid-file check and now.  
                        if test -n "$avoid_race_condition"; then
                            avoid_race_condition=""
                            continue  # Check again.
                        fi

                        log_failure_msg "The server quit without updating PID file ($pid_file)."
                        log_end_msg 1
                        exit 1  # not waiting any more.
                    fi
                fi
                sleep $startup_sleep
		log_progress_msg "."
	    done
	    sleep 1
            if mysqld_status check_alive warn; then
                log_end_msg 0
            else
                log_startup_failure "Please take a look at the syslog."
                log_end_msg 1
            fi
	fi
	;;
  *)
	echo "Usage: $SELF start|stop|restart|restart-bootstrap|reload|force-reload|status|bootstrap-pxc"
	exit 1
	;;
esac