What?

Your application runs in a container hosted on a Diego Cell. A Cloud Foundry deployment may have many cells distributed among multiple Availability Zones (AZs). Diego will automatically balance the applications you deploy across the defined zones. If an AZ goes down (along with your application), Diego will start a new instance of your application in a healthy cell in a different AZ. Depending on demand, you may want to scale your application horizontally (more instances) and/or vertically (more disk & memory).

You already have two instances of dora. Now we’ll scale your app horizontally by bumping your instance count up to five and scale it vertically by increasing your per instance memory to 512M.

How?

  1. Run watch cf app dora to watch the updates happen.
  2. Refer to the cf scale docs to scale your app vertically and horizontally in another terminal tab or buffer.

Expected Result

cf app dora should show five instances and the disk and memory they are each allotted. cf env dora should show new disk and memory limits listed under VCAP_APPLICATION.

Resources

Docs: How the Diego Auction Allocates Jobs Docs: Scaling apps on CF