init

Dockerfile

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+FROM ubuntu:trusty
+
+RUN apt-get update
+RUN apt-get install -y --no-install-recommends \
+    apt-transport-https \
+    ca-certificates \
+    curl \
+    software-properties-common 
+RUN  curl -fsSL https://apt.dockerproject.org/gpg | sudo apt-key add - 
+RUN add-apt-repository \
+       "deb https://apt.dockerproject.org/repo/ \
+       ubuntu-$(lsb_release -cs) \
+       main"
+RUN apt-get update
+
+RUN apt-get -y install docker-engine
+ADD start.sh .
+ENTRYPOINT ./start.sh

rc.local

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+#! /bin/sh
+### BEGIN INIT INFO
+# Provides:          rc.local
+# Required-Start:    $all
+# Required-Stop:
+# Default-Start:     2 3 4 5
+# Default-Stop:
+# Short-Description: Run /etc/rc.local if it exist
+### END INIT INFO
+
+
+PATH=/sbin:/usr/sbin:/bin:/usr/bin
+
+. /lib/init/vars.sh
+. /lib/lsb/init-functions
+
+do_start() {
+        if [ -x /etc/rc.local ]; then
+                [ "$VERBOSE" != no ] && log_begin_msg "Running local boot scripts (/etc/rc.local)"
+                /etc/rc.local
+                ES=$?
+                [ "$VERBOSE" != no ] && log_end_msg $ES
+                return $ES
+        fi
+}
+
+case "$1" in
+    start)
+        do_start
+        ;;
+    restart|reload|force-reload)
+        echo "Error: argument '$1' not supported" >&2
+        exit 3
+        ;;
+    stop)
+        ;;
+    *)
+        echo "Usage: $0 start|stop" >&2
+        exit 3
+        ;;
+esac
+service docker start
+exit 0

start.sh

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+#!/bin/bash
+service docker start
+#run other things