Add Janitor container definition

templates/janitor/0/docker-compose.yml

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+cleanup:
+  image: meltwater/docker-cleanup:1.4.0
+  environment:
+    CLEAN_PERIOD: ${FREQUENCY}
+    DELAY_TIME: "900"
+    KEEP_IMAGES: ${KEEP}
+  labels:
+     io.rancher.scheduler.global: "true"
+     io.rancher.scheduler.affinity:host_label_ne: ${EXCLUDE_LABEL}
+  privileged: true
+  tty: true
+  stdin_open: true
+  volumes:
+    - /var/run/docker.sock:/var/run/docker.sock
+    - /var/lib/docker:/var/lib/docker

templates/janitor/0/rancher-compose.yml

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+.catalog:
+  name: "Janitor"
+  version: "v1.4.0"
+  description: "Docker cleanup"
+  uuid: janitor-0
+  questions: 
+    - variable: "FREQUENCY"
+      label: "Frequency"
+      description: "Run the cleanup on a cycle of this many seconds"
+      default: 3600
+      required: true
+      type: "int"
+    - variable: "EXCLUDE_LABEL"
+      label: "Exclude label"
+      description: "Specify a Rancher host label here that will be used to determine on which hosts the container should not deploy."
+      default: janitor.exclude=true
+      required: true
+      type: "string"
+    - variable: "KEEP"
+      label: "Keep images"
+      description: "A comma separated list of images that should never be removed"
+      default: "rancher/agent:v0.8.2,rancher/agent-instance:v0.6.0"
+      required: false
+      type: "string"
+

templates/janitor/README.md

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+# Janitor
+
+### Topology
+
+A Janitor instance will be started on every host that does not match the
+scheduling rule (default is `janitor.exclude=true`).
+
+### Operation
+
+This will run a task daily (by default) that will delete any unused
+image, and any orphaned volume.  The rancher container images are excluded
+from the list of images to clean up.
+
+This will halp to prevent the /var/lib/docker filesystem from filling up
+with old and unused container images.
+

templates/janitor/catalogIcon-janitor.svg

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+ <!-- Created with SVG-edit - http://svg-edit.googlecode.com/ -->
+ <g>
+  <title>Layer 1</title>
+  <defs>
+    <linearGradient id="grad1" x1="0%" y1="0%" x2="100%" y2="100%">
+      <stop offset="0%" style="stop-color:#5b8805;stop-opacity:1"/>
+      <stop offset="100%" style="stop-color:#5b8805;stop-opacity:0"/>
+    </linearGradient>
+   
+  </defs>
+  <ellipse ry="300" rx="300" id="svg_1" cy="300" cx="300" stroke-width="0" stroke="#000000" fill="#79b506"/>
+  
+  <path d="M191 479.5 L 300 479.5 L 300 600" style="fill:#5b8805; stroke:purple;stroke-width:0"/>
+  <path d="M426.5 145 L 600 300 L 420 300" style="fill:#5b8805; stroke:purple;stroke-width:0"/>
+   <path d="M300 600            A 300 300, 0, 0, 0, 600 300            L 300 300 Z" fill="#5b8805"/>
+  <path d="M 300 300 L 300 470 L 400 470 L 410 300" style="fill:#79b506; stroke:purple;stroke-width:0"/>
+
+  <line stroke-linecap="round" x1="180" y1="159.25" x2="420" y2="159.25" style="stroke:rgb(255,255,255);stroke-width:30"/>
+  <rect x="250" y="129.25" rx="20" ry="20" width="100" height="30" style="fill: transparent; stroke:#fff; stroke-width:10"/>
+  <line stroke-linecap="round" x1="189" y1="198.75" x2="200" y2="466.75" style="stroke:rgb(255,255,255);stroke-width:25"/>
+  <line id="bottom" stroke-linecap="round" x1="411" y1="198.75" x2="400" y2="466.75" style="stroke:rgb(255,255,255);stroke-width:25"/>
+  <line stroke-linecap="square" x1="189" y1="198.75" x2="411" y2="198.75" style="stroke:rgb(255,255,255);stroke-width:25"/>
+  <line stroke-linecap="round" x1="203" y1="470.75" x2="397" y2="470.75" style="stroke:rgb(255,255,255);stroke-width:30"/>
+  <line stroke-linecap="round" x1="260" y1="198.75" x2="265" y2="470.75" style="stroke:rgb(255,255,255);stroke-width:25"/>
+
+  <line stroke-linecap="round" x1="340" y1="198.75" x2="335" y2="470.75" style="stroke:rgb(255,255,255);stroke-width:25"/>
+		
+   
+ </g>
+</svg>

templates/janitor/config.yml

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+name: Janitor
+description: |
+  Automatic cleanup of unused images on hosts, in order to save disk space.
+version: v1.4.0
+category: monitoring
+maintainer: Steve Shipway <s.shipway@auckland.ac.nz>
+