Choose specific host label to deploy the MongoDB cluster..

templates/MongoDB/2/README.md

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+# MongoDB
+
+
+### Info:
+
+ This template creates MongoDB replica set on top of Rancher. Replica set size starts with 3 MongoDB instances, the replica set has the ability to scale up automatically when adding new instances. 
+ 
+ 
+### Usage:
+
+ Select MongoDB from catalog. 
+ 
+ Enter the name of the replica set.
+ 
+ Click deploy.
+ 
+ MongoDB can now be accessed over the Rancher network. 
+ 

templates/MongoDB/2/docker-compose.yml

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+mongo-cluster:
+  restart: always
+  environment:
+    MONGO_SERVICE_NAME: mongo-cluster
+  tty: true
+  entrypoint: /opt/rancher/bin/entrypoint.sh
+  command:
+  - --replSet
+  - "${replset_name}"
+  image: mongo:3.2
+  labels:
+    io.rancher.scheduler.affinity: "${host_label}"
+    io.rancher.container.hostname_override: container_name
+    io.rancher.sidekicks: mongo-base, mongo-datavolume
+  volumes_from:
+    - mongo-datavolume
+    - mongo-base
+mongo-base:
+  restart: always
+  net: none
+  tty: true
+  labels:
+    io.rancher.scheduler.affinity: "${host_label}"
+    io.rancher.container.hostname_override: container_name
+    io.rancher.container.start_once: true
+  image: rancher/mongodb-conf:v0.1.0
+  stdin_open: true
+  entrypoint: /bin/true
+mongo-datavolume:
+  net: none
+  labels:
+    io.rancher.scheduler.affinity: "${host_label}"
+    io.rancher.container.hostname_override: container_name
+    io.rancher.container.start_once: true
+  volumes:
+    - /data/db
+  entrypoint: /bin/true
+  image: busybox

templates/MongoDB/2/rancher-compose.yml

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+.catalog:
+  name: "MongoDB"
+  version: "3.2-rancher1"
+  description: "MongoDB Replica Set"
+  uuid: mongodb-1
+  minimum_rancher_version: v0.46.0
+  questions:
+    - variable: replset_name
+      description: "Name of the MongoDB replicaSet"
+      label: "ReplicaSet Name"
+      type: "string"
+      required: true
+      default: "rs0"
+    - variable: "host_label"
+      label: "Host Label to MongoDB Tags"
+      description: |
+        Comma delimited list of host label to use as MongoDB 'value' tag.
+        Example: 'database'
+      required: false
+      type: "string"
+mongo-cluster:
+  scale: 3
+  retain_ip: true
+  metadata:
+    mongo:
+      yml:
+        replset.name: "${replset_name}"