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✏️ Editing: K01docker

#!/bin/sh
set -e

### BEGIN INIT INFO
# Provides:           docker
# Required-Start:     $syslog $remote_fs
# Required-Stop:      $syslog $remote_fs
# Should-Start:       cgroupfs-mount cgroup-lite
# Should-Stop:        cgroupfs-mount cgroup-lite
# Default-Start:      2 3 4 5
# Default-Stop:       0 1 6
# Short-Description:  Create lightweight, portable, self-sufficient containers.
# Description:
#  Docker is an open-source project to easily create lightweight, portable,
#  self-sufficient containers from any application. The same container that a
#  developer builds and tests on a laptop can run at scale, in production, on
#  VMs, bare metal, OpenStack clusters, public clouds and more.
### END INIT INFO

export PATH=/sbin:/bin:/usr/sbin:/usr/bin:/usr/local/sbin:/usr/local/bin

BASE=docker

# modify these in /etc/default/$BASE (/etc/default/docker)
DOCKERD=/usr/bin/dockerd
# This is the pid file managed by docker itself
DOCKER_PIDFILE=/var/run/$BASE.pid
# This is the pid file created/managed by start-stop-daemon
DOCKER_SSD_PIDFILE=/var/run/$BASE-ssd.pid
DOCKER_LOGFILE=/var/log/$BASE.log
DOCKER_OPTS=
DOCKER_DESC="Docker"

# Get lsb functions
. /lib/lsb/init-functions

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

# Check docker is present
if [ ! -x $DOCKERD ]; then
	log_failure_msg "$DOCKERD not present or not executable"
	exit 1
fi

fail_unless_root() {
	if [ "$(id -u)" != '0' ]; then
		log_failure_msg "$DOCKER_DESC must be run as root"
		exit 1
	fi
}

case "$1" in
	start)
		fail_unless_root

touch "$DOCKER_LOGFILE"
		chgrp docker "$DOCKER_LOGFILE"

# Only set the hard limit (soft limit should remain as the system default of 1024):
		ulimit -Hn 524288

# Having non-zero limits causes performance problems due to accounting overhead
		# in the kernel. We recommend using cgroups to do container-local accounting.
		if [ "$BASH" ]; then
			ulimit -u unlimited
		else
			ulimit -p unlimited
		fi

log_begin_msg "Starting $DOCKER_DESC: $BASE"
		start-stop-daemon --start --background \
			--no-close \
			--exec "$DOCKERD" \
			--pidfile "$DOCKER_SSD_PIDFILE" \
			--make-pidfile \
			-- \
			-p "$DOCKER_PIDFILE" \
			$DOCKER_OPTS \
			>> "$DOCKER_LOGFILE" 2>&1
		log_end_msg $?
		;;

stop)
		fail_unless_root
		if [ -f "$DOCKER_SSD_PIDFILE" ]; then
			log_begin_msg "Stopping $DOCKER_DESC: $BASE"
			start-stop-daemon --stop --pidfile "$DOCKER_SSD_PIDFILE" --retry 10
			log_end_msg $?
		else
			log_warning_msg "Docker already stopped - file $DOCKER_SSD_PIDFILE not found."
		fi
		;;

restart)
		fail_unless_root
		docker_pid=$(cat "$DOCKER_SSD_PIDFILE" 2> /dev/null || true)
		[ -n "$docker_pid" ] \
			&& ps -p $docker_pid > /dev/null 2>&1 \
			&& $0 stop
		$0 start
		;;

force-reload)
		fail_unless_root
		$0 restart
		;;

status)
		status_of_proc -p "$DOCKER_SSD_PIDFILE" "$DOCKERD" "$DOCKER_DESC"
		;;

*)
		echo "Usage: service docker {start|stop|restart|status}"
		exit 1
		;;
esac

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