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Showing content from https://help.github.com/en/actions/tutorials/use-actions-runner-controller/authenticate-to-the-api below:

Authenticating ARC to the GitHub API

Learn how to authenticate Actions Runner Controller to the GitHub API.

You can authenticate Actions Runner Controller (ARC) to the GitHub API by using a GitHub App or by using a personal access token (classic).

Authenticating ARC with a GitHub App

Create a GitHub App that is owned by an organization. For more information, see Registering a GitHub App. Configure the GitHub App as follows.
1. For "Homepage URL," enter https://github.com/actions/actions-runner-controller.
2. Under "Permissions," click Repository permissions. Then use the dropdown menus to select the following access permissions.
  - Administration: Read and write
    
    Note
    
    Administration: Read and write is only required when configuring Actions Runner Controller to register at the repository scope. It is not required to register at the organization scope.
  - Metadata: Read-only
3. Under "Permissions," click Organization permissions. Then use the dropdown menus to select the following access permissions.
  - Self-hosted runners: Read and write
After creating the GitHub App, on the GitHub App's page, note the value for "App ID". You will use this value later.
Under "Private keys", click Generate a private key, and save the .pem file. You will use this key later.
In the menu at the top-left corner of the page, click Install app, and next to your organization, click Install to install the app on your organization.
After confirming the installation permissions on your organization, note the app installation ID. You will use it later. You can find the app installation ID on the app installation page, which has the following URL format:

https://github.com/organizations/ORGANIZATION/settings/installations/INSTALLATION_ID
Register the app ID, installation ID, and the downloaded .pem private key file from the previous steps to Kubernetes as a secret.

To create a Kubernetes secret with the values of your GitHub App, run the following command.

Note

Create the secret in the same namespace where the gha-runner-scale-set chart is installed. In this example, the namespace is arc-runners to match the quickstart documentation. For more information, see Quickstart for Actions Runner Controller.
Bash
```
kubectl create secret generic pre-defined-secret \
   --namespace=arc-runners \
   --from-literal=github_app_id=123456 \
   --from-literal=github_app_installation_id=654321 \
   --from-literal=github_app_private_key='-----BEGIN RSA PRIVATE KEY-----********'
```
```
kubectl create secret generic pre-defined-secret \
   --namespace=arc-runners \
   --from-literal=github_app_id=123456 \
   --from-literal=github_app_installation_id=654321 \
   --from-literal=github_app_private_key='-----BEGIN RSA PRIVATE KEY-----********'
```
Then using the githubConfigSecret property in your copy of the values.yaml file, pass the secret name as a reference.
```
githubConfigSecret: pre-defined-secret
```

For additional Helm configuration options, see values.yaml in the ARC repository.

Authenticating ARC with a personal access token (classic)

ARC can use personal access tokens (classic) to register self-hosted runners.

Create a personal access token (classic) with the required scopes. The required scopes are different depending on whether you are registering runners at the repository or organization level. For more information on how to create a personal access token (classic), see Managing your personal access tokens.

The following is the list of required personal access token scopes for ARC runners.
- Repository runners: repo
- Organization runners: admin:org
To create a Kubernetes secret with the value of your personal access token (classic), use the following command.

Note

Create the secret in the same namespace where the gha-runner-scale-set chart is installed. In this example, the namespace is arc-runners to match the quickstart documentation. For more information, see Quickstart for Actions Runner Controller.
Bash
```
kubectl create secret generic pre-defined-secret \
   --namespace=arc-runners \
   --from-literal=github_token='YOUR-PAT'
```
```
kubectl create secret generic pre-defined-secret \
   --namespace=arc-runners \
   --from-literal=github_token='YOUR-PAT'
```
In your copy of the values.yaml file, pass the secret name as a reference.
```
githubConfigSecret: pre-defined-secret
```
For additional Helm configuration options, see values.yaml in the ARC repository.

Authenticating ARC with a fine-grained personal access token

ARC can use fine-grained personal access tokens to register self-hosted runners.

Create a fine-grained personal access token with the required scopes. The required scopes are different depending on whether you are registering runners at the repository or organization level. For more information on how to create a fine-grained personal access token, see Managing your personal access tokens.

The following is the list of required personal access token scopes for ARC runners.
- Repository runners:
  - Administration: Read and write
- Organization runners:
  - Administration: Read
  - Self-hosted runners: Read and write
To create a Kubernetes secret with the value of your fine-grained personal access token, use the following command.

Note

Create the secret in the same namespace where the gha-runner-scale-set chart is installed. In this example, the namespace is arc-runners to match the quickstart documentation. For more information, see Quickstart for Actions Runner Controller.
Bash
```
kubectl create secret generic pre-defined-secret \
   --namespace=arc-runners \
   --from-literal=github_token='YOUR-PAT'
```
```
kubectl create secret generic pre-defined-secret \
   --namespace=arc-runners \
   --from-literal=github_token='YOUR-PAT'
```
In your copy of the values.yaml file, pass the secret name as a reference.
```
githubConfigSecret: pre-defined-secret
```
For additional Helm configuration options, see values.yaml in the ARC repository.

Authenticating ARC with vault secrets

Note

Vault integration is currently available in public preview with support for Azure Key Vault.

Starting with gha-runner-scale-set version 0.12.0, ARC supports retrieving GitHub credentials from an external vault. Vault integration is configured per runner scale set. This means you can run some scale sets using Kubernetes secrets while others use vault-based secrets, depending on your security and operational requirements.

Enabling Vault Integration

To enable vault integration for a runner scale set:

Set the githubConfigSecret field in your values.yaml file to the name of the secret key stored in your vault. This value must be a string.
Uncomment and configure the keyVault section in your values.yaml file with the appropriate provider and access details.
Provide the required certificate (.pfx) to both the controller and the listener. You can do this by: *Rebuilding the controller image with the certificate included, or *Mounting the certificate as a volume in both the controller and the listener using the listenerTemplate and controllerManager fields.

Secret Format

The secret stored in Azure Key Vault must be in JSON format. The structure depends on the type of authentication you are using:

Example: GitHub Token

{
  "github_token": "TOKEN"
}

Example: GitHub App

{
  "github_app_id": "APP_ID_OR_CLIENT_ID",
  "github_app_installation_id": "INSTALLATION_ID",
  "github_app_private_key": "PRIVATE_KEY"
}

Configuring values.yaml for Vault Integration

The certificate is stored as a .pfx file and mounted to the container at /akv/cert.pfx. Below is an example of how to configure the keyVault section to use this certificate for authentication:

keyVault:
  type: "azure_key_vault"
  proxy:
    https:
      url: "PROXY_URL"
      credentialSecretRef: "PROXY_CREDENTIALS_SECRET_NAME"
    http: {}
    noProxy: []
  azureKeyVault:
    clientId: <AZURE_CLIENT_ID>
    tenantId: <AZURE_TENANT_ID>
    url: <AZURE_VAULT_URL>
    certificatePath: "/akv/cert.pfx"

Providing the Certificate to the Controller and Listener

ARC requires a .pfx certificate to authenticate with the vault. This certificate must be made available to both the controller and the listener components during controller installation. You can do this by mounting the certificate as a volume using the controllerManager and listenerTemplate fields in your values.yaml file:

volumes:
  - name: cert-volume
    secret:
      secretName: my-cert-secret
volumeMounts:
  - mountPath: /akv
    name: cert-volume
    readOnly: true

listenerTemplate:
  volumeMounts:
    - name: cert-volume
      mountPath: /akv/certs
      readOnly: true
  volumes:
    - name: cert-volume
      secret:
        secretName: my-cert-secret

The code below is an example of a scale set values.yml file.

listenerTemplate:
  spec:
    containers:
      - name: listener
        volumeMounts:
          - name: cert-volume
            mountPath: /akv
            readOnly: true
    volumes:
      - name: cert-volume
        secret:
          secretName: my-cert-secret

Legal notice

Portions have been adapted from https://github.com/actions/actions-runner-controller/ under the Apache-2.0 license:

Copyright 2019 Moto Ishizawa

Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at

    http://www.apache.org/licenses/LICENSE-2.0

Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.

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