Arm resources


This document will walk you through the setup steps required to use an Arm resource on CircleCI. Arm resources are not available on CircleCI Server 1.x or 2.x.

CircleCI offers multiple kinds of environments for you to run jobs in. In your CircleCI config.yml file you can choose the right environment for your job using the resource_class key. CircleCI offers two Arm resources as part of the machine executor:

  • arm.medium - arm64 architecture, 2 vCPU, 8GB RAM
  • arm.large - arm64 architecture, 4 vCPU, 16GB RAM

Which are available under these images:

  • ubuntu-2004:202101-01 - most recent, recommended for all users
  • ubuntu-2004:202011-01 - deprecated as of Feb 3, 2021

As these are machine executor resources, each class is a dedicated VM that is created specifically for your job and subsequently taken down after the job has finished running.

Pricing and availability

The following Arm resource class is available to all CircleCI customers:

Resource class name Specs Requisite Plan
arm.medium 2 vCPUs, 8GB RAM Free, Performance, Scale, Custom
arm.large 4 vCPUs, 16GB RAM Performance, Scale, Custom

For pricing and availability check out our Pricing page.

At this moment, Arm resources are only available on our cloud offering. If you are a CircleCI Server customer and are looking to try Arm resources, consider creating a CircleCI Cloud account, or contact your Customer Success Manager to request Arm on Server.

Using Arm resources

Update your .circleci/config.yml file to use Arm resources. Consider the example config:

# .circleci/config.yml
version: 2.1

      image: ubuntu-2004:202101-01
    resource_class: arm.medium
      - run: uname -a
      - run: echo "Hello, Arm!"

      image: ubuntu-2004:202101-01
    resource_class: arm.large
      - run: uname -a
      - run: echo "Hello, Arm!"

      - build-medium
      - build-large

Please note that it is indeed possible to mix various resources in the same configuration (and even the same workflow).


  • Some orbs that include an executable may not be compatible with Arm at this moment. If you run into issues with orbs on Arm, please open an issue.
  • We currently do not provide support for 32-bit Arm architectures. Only 64-bit arm64 architectures are supported at this time.
  • There may be up to 2 minutes of spin-up time before your job actually starts running. This time will decrease as more customers start using Arm resources.
  • If there is software you require that is not available in the image, please open an issue to let us know.

Learn More

Take the Arm course with CircleCI Academy to learn more about using Arm resources and associated use cases.

Help make this document better

This guide, as well as the rest of our docs, are open-source and available on GitHub. We welcome your contributions.