Copied from rancher community catalog as starting point

templates/RocketChat/0/docker-compose.yml

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+mongo:
+  image: mongo
+# volumes:
+#    - ./data/runtime/db:/data/db
+#    - ./data/dump:/dump
+  command: mongod --smallfiles --oplogSize 128
+
+rocketchat:
+  image: rocketchat/rocket.chat:latest
+# volumes:
+#    - ./uploads:/app/uploads
+  environment:
+    - PORT=3000
+    - ROOT_URL=http://yourhost:3000
+    - MONGO_URL=mongodb://mongo:27017/rocketchat
+  links:
+    - mongo:mongo
+  ports:
+    - 3000:3000
+
+# hubot, the popular chatbot (add the bot user first and change the password before starting this image)
+hubot:
+  image: rocketchat/hubot-rocketchat
+  environment:
+    - ROCKETCHAT_URL=rocketchat:3000
+    - ROCKETCHAT_ROOM=GENERAL
+    - ROCKETCHAT_USER=bot
+    - ROCKETCHAT_PASSWORD=botpassword
+    - BOT_NAME=bot
+# you can add more scripts as you'd like here, they need to be installable by npm
+    - EXTERNAL_SCRIPTS=hubot-help,hubot-seen,hubot-links,hubot-diagnostics
+  links:
+    - rocketchat:rocketchat
+# this is used to expose the hubot port for notifications on the host on port 3001, e.g. for hubot-jenkins-notifier
+  ports:
+    - 3001:8080

templates/RocketChat/0/rancher-compose.yml

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+.catalog:
+  name: "RocketChat"
+  version: "v0.1-educaas"
+  description: "Have your own Slack like online chat, built with Meteor."
+  uuid: rocketchat-0
+  questions:
+
+rocketchat: