How to set the resource_class for docker and machine images

If you need more or fewer resources when using CircleCI you can set the resource_class which allows you to use a different amount of resources.

Instructions

The following examples show the one-line change that allows you to set the resource_class to large for a docker build.

If you do not define a resource_class one will be allocated and you can view which was used on the workflows page of a job.

An example where no resource_class is set is shown below:

jobs:
  build:
    docker:
    - image: circleci/ruby:2.7

By adding resource_class: large at the same indentation as docker it will set the resource_class to large.

jobs:
  build:
    docker:
      - image: circleci/ruby:2.7
    resource_class: large

An example using a machine executor can be seen below

jobs:
  build:
    machine:
      image: ubuntu-2204:current

By adding resource_class: large at the same indentation as machine it will set the resource_class to large.

jobs:
  build:
    machine:
      image: ubuntu-2204:current
    resource_class: large

You will now see that on the workflow page, the resource_class that you set is always used.

To see all of the available resource_class selections available you can view the following link: