add watchtower

README.md

@@ -77,4 +77,5 @@ dockerfiles
 - [x] owncloud
 - [x] registrator
 - [x] rocket.chat
+- [x] watchtower
 

watchtower/README.md

@@ -0,0 +1,42 @@
+watchtower
+==========
+
+![](https://badge.imagelayers.io/centurylink/watchtower:latest.svg)
+
+[`Watchtower`][1] is an application that will monitor your running Docker containers
+and watch for changes to the images that those containers were originally
+started from. If watchtower detects that an image has changed, it will
+automatically restart the container using the new image.
+
+## docker-compose.yml
+
+```
+watchtower:
+  image: centurylink/watchtower
+  command: >
+    mysql
+    mongo
+    nginx
+    redis
+  volumes:
+    - /var/run/docker.sock:/var/run/docker.sock
+  restart: always
+```
+
+> It'll monitor all containers if no `command` in YAML.
+
+## Up and Running
+
+```
+$ docker-compose up -d
+
+$ docker-compose logs
+watchtower_1 | time="2015-09-02T02:31:39Z" level=info msg="Checking containers for updated images"
+watchtower_1 | time="2015-09-02T02:31:56Z" level=info msg="Found new redis:latest image (3d86...76)"
+watchtower_1 | time="2015-09-02T02:31:56Z" level=info msg="Stopping /redis (8f51...f4) with SIGTERM"
+watchtower_1 | time="2015-09-02T02:32:06Z" level=info msg="Starting /redis"
+watchtower_1 | time="2015-09-02T02:37:06Z" level=info msg="Checking containers for updated images"
+watchtower_1 | time="2015-09-02T02:42:10Z" level=info msg="Checking containers for updated images"
+```
+
+[1]: https://hub.docker.com/r/centurylink/watchtower/

watchtower/docker-compose.yml

@@ -0,0 +1,10 @@
+watchtower:
+  image: centurylink/watchtower
+  command: >
+    mysql
+    mongo
+    nginx
+    redis
+  volumes:
+    - /var/run/docker.sock:/var/run/docker.sock
+  restart: always