Using the mongodb community cookbook to set up a MongoDB replicat set within an AWS OpsWorks custom layer.

Inspired by the blog post Deploying MongoDB with OpsWorks.

1. In AWS OpsWorks create a stack with the following properties:

• Chef version: 11.10
• Use custom Chef cookbooks: yes
• Repository type: Git
• Repository URL: https://github.com/ujuettner/opsworks-mongodb-example.git
• Manage Berkshelf: yes
• Berkshelf version: 2.0.14
• Custom JSON:

{
  "mongodb": {
    "app_name": "todo_express",
    "config": {
      "replSet": "todors"
    }
  },
  "opsworks": {
    "data_bags": {
      "mongodb": {
        "mongodb1": {
          "mongodb": {
            "config": {
              "port": 27017
            },
            "replica_build_indexes": true,
            "replica_slave_delay": 0,
            "replica_priority": 1,
            "replica_tags": {},
            "replica_votes": 1
          }
        },
        "mongodb2": {
          "mongodb": {
            "config": {
              "port": 27017
            },
            "replica_build_indexes": true,
            "replica_slave_delay": 0,
            "replica_priority": 1,
            "replica_tags": {},
            "replica_votes": 1
          }
        },
        "mongodb3": {
          "mongodb": {
            "config": {
              "port": 27017
            },
            "replica_build_indexes": true,
            "replica_slave_delay": 0,
            "replica_priority": 1,
            "replica_tags": {},
            "replica_votes": 1
          }
        },
...
      }
    }
  }
}

2. Add a custom layer, name it mongodb and add the following Custom Chef Recipes:

• Setup: server
• Configure: mongodb::replicaset

3. Add a Node.js App Server layer and add client::deploy as Custom Chef Recipe for the Deploy lifecycle event.
4. Add an app with the following properties:

• Name: todo-express
• Short name: todo_express
• Type: Node.js
• App source type: Git
• Repository URL: https://github.com/ujuettner/todo-express.git

Using Chef 11.10 is required, as Berkshelf, search and data bags are used:

• Berkshelf is used to load the mongodb community cookbook.
• Using search to find all online nodes within the mongodb layer.
• Data bags to store required properties for the found nodes - as there's no Chef Server as central storage of such properties, a data bag is used.
• mongodb/definitions/mongodb.rb is an overriding copy from the mongodb community cookbook to implement our special search query and to retreive the required properties from the data bag.