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Scaling an AWS cluster

The DC/OS AWS CloudFormation template is optimized to run DC/OS, but you might want to change the number of agent nodes based on your needs.

Important: Scaling down your AWS cluster could result in data loss. It is recommended that you scale down by 1 node at a time, letting the DC/OS service recover. For example, if you are running a DC/OS service and you scale down from 10 to 5 nodes, this could result in losing all the instances of your service.

To change the number of agent nodes with AWS:

  1. From AWS CloudFormation Management page, select your DC/OS cluster and click Update Stack.
  2. Click through to the Specify Parameters page, and you can specify new values for the PublicSlaveInstanceCount and SlaveInstanceCount.
  3. On the Options page, accept the defaults and click Next. Tip: You can choose whether to rollback on failure. By default this option is set to Yes.
  4. On the Review page, check the acknowledgement box and then click Create.

Your new machines will take a few minutes to initialize; you can watch them in the EC2 console. The DC/OS web interface will update as soon as the new nodes register.

Upgrading

See the upgrade documentation.