Original /etc/init.d/docker file from deb (usefull for WSL2)

docker

#!/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"

                ulimit -n 1048576

                # 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