Installing on CircleCI
Create CircleCI resource classes
In your CircleCI account, navigate to Self-Hosted Runners.
At least two custom "Resource Classes" are required. These used to assign CircleCI jobs to specific runner groups:
- The default runner group resource class is typically
my-org/aspect-default
. - The warming runner group resource class is typically
my-org/aspect-warming
.
If overriding the queue names in .aspect/workflows/config.yaml
, the preceding resource class names need to be adjusted accordingly.
Each additional runner group requires a unique "Resource Class" so that it can be targeted by jobs.
CircleCI provides unique tokens for these pools for Aspect-managed self-hosted runners to connect to CircleCI to accept work. Write these down as you'll need them below.
Generate a CircleCI personal access token
In CircleCI, navigate to https://app.circleci.com/settings/user/tokens and generate a New Token.
Aspect recommends creating this token using a bot account so that it is not tied to a human user account.
Provide CircleCI API tokens
For Aspect Workflows to connect to CircleCI, it needs three credentials for each of the two runner pools created above.
resource_class
is the Resource Class name created earlier, eithermy-org/aspect-default
ormy-org/aspect-warming
access_token
is the 40-character personal access token created earlier for making API calls to CircleCI.auth_token
is the 80-character "resource class token" that CircleCI produced when the Resource Class was created.
The resource_class
and auth_token
are unique per runner pool, but you can re-use the same access_token
for each.
There are two secrets to populate with the credentials for the two runner pools. The secret values should be formatted as JSON object providing these three keys. For example,
{"resource_class":"my-org/aspect-default","access_token":"******","auth_token":"******"}
and,
{"resource_class":"my-org/aspect-warming","access_token":"******","auth_token":"******"}
You can set the values in the AWS console:
- Navigate to AWS Console > AWS Secrets Manager > Secrets,
- Locate the keys named
aw_cci_<hash>__<runner pool name>
, for exampleaw_cci_63eb73cb0f156210__default
andaw_cci_0c03c0e5c34924f0__warming
, and set the "Plaintext" values to the JSON strings for the respective runner pools. They also appear as separate Key/value pairs in the AWS user interface.
Alternatively, you can supply the values using Terraform.
Workflows exposes the AWS Secrets Manager Secret Id via an output from the Workflows terraform module.
This ID is named runner_secret_ids["runner pool name"]
where the "runner pool name" matches the
cci_runner_groups
input parameter.
For example, if main.tf
contains
cci_runner_groups = {
default = {
max_runners = 10
...
}
warming = {
max_runners = 1
...
}
}
Then you configure these secrets with:
resource "aws_secretsmanager_secret_version" "runner" {
secret_id = module.aspect_workflows.runner_secret_ids["default"]
secret_string = "my-secret-for-default"
}
resource "aws_secretsmanager_secret_version" "runner_warming" {
secret_id = module.aspect_workflows.runner_secret_ids["warming"]
secret_string = "my-secret-for-warming"
}
The secret_string
values should be supplied using whatever mechanism you already use for managing secrets.
Configure the workflow
Now the CircleCI configuration file may be updated.
Very simple repositories may be able to use Aspect's CircleCI orb.
It is installed into .circleci/config.yaml
, following the instructions at
https://circleci.com/developer/orbs/orb/aspect-build/workflows.
However, CircleCI is very limited. The Orb must use the continuations feature, and only one continuation may be present in an entire workflow. As an alternative to using the Orb, a large amount of YAML may need to be vendored into the repository. See https://github.com/aspect-build/aspect-cli/blob/main/.circleci/BUILD.bazel for an example.
A number of Workflows features require read-only access to the GitHub API.
For example, if the "Branch Freshness" strategy is set to rebase
, it requires a GitHub token
to make a GET
request to https://api.github.com/repos/{owner}/{repo}/pulls/{pull_number}
.
The token must therefore be granted read
permission to Pull Requests,
scoped to any repositories that are tested by Workflows.
This secret can be supplied in Terraform, similarly to the tokens described above.
resource "aws_secretsmanager_secret_version" "gh_api_token" {
secret_id = module.aspect-workflows.github_token_secret_id
secret_string = "my-github-token"
}