mirror of https://github.com/docker/docs.git
56 lines
2.3 KiB
Markdown
56 lines
2.3 KiB
Markdown
---
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description: Scaling your stack
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keywords: aws, amazon, iaas, tutorial
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title: Modify Docker install on AWS
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---
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## Scaling workers
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You can scale the worker count using the AWS Auto Scaling group. Docker
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automatically joins or removes new instances to the Swarm.
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There are currently two ways to scale your worker group. You can "update" your
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stack, and change the number of workers in the CloudFormation template
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parameters, or you can manually update the Auto Scaling group in the AWS console
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for EC2 auto scaling groups.
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Changing manager count live is _not_ currently supported.
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### AWS console
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Log in to the AWS console, and go to the EC2 dashboard. On the lower left hand
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side select the "Auto Scaling Groups" link.
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Look for the Auto Scaling group with the name that looks like
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$STACK_NAME-NodeASG-* Where `$STACK_NAME` is the name of the stack you created
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when filling out the CloudFormation template for Docker for AWS. Once you find
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it, click the checkbox, next to the name. Then Click on the "Edit" button on the
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lower detail pane.
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Change the "Desired" field to the size of the worker pool that you would like, and hit "Save".
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This takes a few minutes and add the new workers to your swarm
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automatically. To lower the number of workers back down, you just need to update
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"Desired" again, with the lower number, and it shrinks the worker pool until
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it reaches the new size.
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### CloudFormation update
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Go to the CloudFormation management page, and click the checkbox next to the
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stack you want to update. Then Click on the action button at the top, and select
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"Update Stack".
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Pick "Use current template", and then click "Next". Fill out the same parameters
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you have specified before, but this time, change your worker count to the new
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count, click "Next". Answer the rest of the form questions. CloudFormation
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shows you a preview of the changes. Review the changes and if they
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look good, click "Update". CloudFormation changes the worker pool size to
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the new value you specified. It takes a few minutes (longer for a larger
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increase / decrease of nodes), but when complete the swarm has
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the new worker pool size.
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