github.com/kaisenlinux/docker.io@v0.0.0-20230510090727-ea55db55fac7/debian/docker.io.docker.init (about)

     1  #!/bin/sh
     2  set -e
     3  
     4  ### BEGIN INIT INFO
     5  # Provides:           docker
     6  # Required-Start:     $syslog $remote_fs
     7  # Required-Stop:      $syslog $remote_fs
     8  # Should-Start:       cgroupfs-mount cgroup-lite
     9  # Should-Stop:        cgroupfs-mount cgroup-lite
    10  # Default-Start:      2 3 4 5
    11  # Default-Stop:       0 1 6
    12  # Short-Description:  Create lightweight, portable, self-sufficient containers.
    13  # Description:
    14  #  Docker is an open-source project to easily create lightweight, portable,
    15  #  self-sufficient containers from any application. The same container that a
    16  #  developer builds and tests on a laptop can run at scale, in production, on
    17  #  VMs, bare metal, OpenStack clusters, public clouds and more.
    18  ### END INIT INFO
    19  
    20  export PATH=/sbin:/bin:/usr/sbin:/usr/bin:/usr/local/sbin:/usr/local/bin
    21  
    22  BASE=docker
    23  
    24  # modify these in /etc/default/$BASE (/etc/default/docker)
    25  DOCKERD=/usr/sbin/dockerd
    26  # This is the pid file managed by docker itself
    27  DOCKER_PIDFILE=/var/run/$BASE.pid
    28  # This is the pid file created/managed by start-stop-daemon
    29  DOCKER_SSD_PIDFILE=/var/run/$BASE-ssd.pid
    30  DOCKER_LOGFILE=/var/log/$BASE.log
    31  DOCKER_OPTS=
    32  DOCKER_DESC="Docker"
    33  
    34  # Get lsb functions
    35  . /lib/lsb/init-functions
    36  
    37  if [ -f /etc/default/$BASE ]; then
    38  	. /etc/default/$BASE
    39  fi
    40  
    41  # Check docker is present
    42  if [ ! -x $DOCKERD ]; then
    43  	log_failure_msg "$DOCKERD not present or not executable"
    44  	exit 1
    45  fi
    46  
    47  fail_unless_root() {
    48  	if [ "$(id -u)" != '0' ]; then
    49  		log_failure_msg "$DOCKER_DESC must be run as root"
    50  		exit 1
    51  	fi
    52  }
    53  
    54  cgroupfs_mount() {
    55  	# see also https://github.com/tianon/cgroupfs-mount/blob/master/cgroupfs-mount
    56  	if grep -v '^#' /etc/fstab | grep -q cgroup \
    57  		|| [ ! -e /proc/cgroups ] \
    58  		|| [ ! -d /sys/fs/cgroup ]; then
    59  		return
    60  	fi
    61  	if ! mountpoint -q /sys/fs/cgroup; then
    62  		mount -t tmpfs -o uid=0,gid=0,mode=0755 cgroup /sys/fs/cgroup
    63  	fi
    64  	(
    65  		cd /sys/fs/cgroup
    66  		for sys in $(awk '!/^#/ { if ($4 == 1) print $1 }' /proc/cgroups); do
    67  			mkdir -p $sys
    68  			if ! mountpoint -q $sys; then
    69  				if ! mount -n -t cgroup -o $sys cgroup $sys; then
    70  					rmdir $sys || true
    71  				fi
    72  			fi
    73  		done
    74  	)
    75  }
    76  
    77  case "$1" in
    78  	start)
    79  		fail_unless_root
    80  
    81  		cgroupfs_mount
    82  
    83  		touch "$DOCKER_LOGFILE"
    84  		chgrp docker "$DOCKER_LOGFILE"
    85  
    86  		ulimit -n 1048576
    87  
    88  		# Having non-zero limits causes performance problems due to accounting overhead
    89  		# in the kernel. We recommend using cgroups to do container-local accounting.
    90  		if [ "$BASH" ]; then
    91  			ulimit -u unlimited
    92  		else
    93  			ulimit -p unlimited
    94  		fi
    95  
    96  		log_begin_msg "Starting $DOCKER_DESC: $BASE"
    97  		$0 status >>/dev/null \
    98  		|| start-stop-daemon --start --background \
    99  			--no-close \
   100  			--exec "$DOCKERD" \
   101  			--pidfile "$DOCKER_SSD_PIDFILE" \
   102  			--make-pidfile \
   103  			-- \
   104  			-p "$DOCKER_PIDFILE" \
   105  			$DOCKER_OPTS \
   106  			>> "$DOCKER_LOGFILE" 2>&1
   107  		log_end_msg $?
   108  		;;
   109  
   110  	stop)
   111  		fail_unless_root
   112  		if [ -f "$DOCKER_SSD_PIDFILE" ]; then
   113  			log_begin_msg "Stopping $DOCKER_DESC: $BASE"
   114  			start-stop-daemon --stop --pidfile "$DOCKER_SSD_PIDFILE" --remove-pidfile --retry 10
   115  			log_end_msg $?
   116  		else
   117  			log_warning_msg "Docker already stopped - file $DOCKER_SSD_PIDFILE not found."
   118  		fi
   119  		;;
   120  
   121  	restart)
   122  		fail_unless_root
   123  		docker_pid=$(cat "$DOCKER_SSD_PIDFILE" 2> /dev/null)
   124  		[ -n "$docker_pid" ] \
   125  			&& ps -p $docker_pid > /dev/null 2>&1 \
   126  			&& $0 stop
   127  		$0 start
   128  		;;
   129  
   130  	force-reload)
   131  		fail_unless_root
   132  		$0 restart
   133  		;;
   134  
   135  	status)
   136  		status_of_proc -p "$DOCKER_SSD_PIDFILE" "$DOCKERD" "$DOCKER_DESC"
   137  		;;
   138  
   139  	*)
   140  		echo "Usage: service docker {start|stop|restart|status}"
   141  		exit 1
   142  		;;
   143  esac