update init script

templates/docker-init.j2

@@ -1,12 +1,61 @@
 # Generated by Ansible for {{ansible_fqdn}}
 description "Docker daemon"
 
-start on filesystem
+start on (filesystem and net-device-up IFACE!=lo)
 stop on runlevel [!2345]
+limit nofile 524288 1048576
+limit nproc 524288 1048576
 
 respawn
 
+kill timeout 20
+
+pre-start script
+        # see also https://github.com/tianon/cgroupfs-mount/blob/master/cgroupfs-mount
+        if grep -v '^#' /etc/fstab | grep -q cgroup \
+                || [ ! -e /proc/cgroups ] \
+                || [ ! -d /sys/fs/cgroup ]; then
+                exit 0
+        fi
+        if ! mountpoint -q /sys/fs/cgroup; then
+                mount -t tmpfs -o uid=0,gid=0,mode=0755 cgroup /sys/fs/cgroup
+        fi
+        (
+                cd /sys/fs/cgroup
+                for sys in $(awk '!/^#/ { if ($4 == 1) print $1 }' /proc/cgroups); do
+                        mkdir -p $sys
+                        if ! mountpoint -q $sys; then
+                                if ! mount -n -t cgroup -o $sys cgroup $sys; then
+                                        rmdir $sys || true
+                                fi
+                        fi
+                done
+        )
+end script
+
 script
-  [ ! -f /etc/default/docker ] || . /etc/default/docker
-  /usr/bin/docker {{ docker_daemon_opts }} $DOCKER_OPTS
+        # modify these in /etc/default/$UPSTART_JOB (/etc/default/docker)
+        DOCKER=/usr/bin/$UPSTART_JOB
+        DOCKER_OPTS=
+        if [ -f /etc/default/$UPSTART_JOB ]; then
+                . /etc/default/$UPSTART_JOB
+        fi
+        exec "$DOCKER" daemon $DOCKER_OPTS
+end script
+
+# Don't emit "started" event until docker.sock is ready.
+# See https://github.com/docker/docker/issues/6647
+post-start script
+        DOCKER_OPTS=
+        if [ -f /etc/default/$UPSTART_JOB ]; then
+                . /etc/default/$UPSTART_JOB
+        fi
+        if ! printf "%s" "$DOCKER_OPTS" | grep -qE -e '-H|--host'; then
+                while ! [ -e /var/run/docker.sock ]; do
+                        initctl status $UPSTART_JOB | grep -qE "(stop|respawn)/" && exit 1
+                        echo "Waiting for /var/run/docker.sock"
+                        sleep 0.1
+                done
+                echo "/var/run/docker.sock is up"
+        fi
 end script