Phonebook Application Deployed on AKS Using GitHub Actions

This project sets up a CI/CD pipeline using GitHub Actions to deploy infrastructure using Terraform and deploy Phonebook Application to that infrastructure.

Setting Credentials

Terraform needs Azure Credentials to create the infrastructure. We need to provide these values in environment for Terraform to look up.

• ARM_SUBSCRIPTION_ID
• ARM_TENANT_ID
• ARM_CLIENT_ID
• ARM_CLIENT_SECRET

To get these credentials we use this command in a terminal;

az ad sp create-for-rbac --sdk-auth --role="Contributor" --scopes="/subscriptions/<subscription_id>"

Terraform also needs GitHub Token to create the variables in GitHub repository. We provide the token securely by defining it in the GitHub Actions secrets as GH_TOKEN. We assign this value in the pipeline environment section to GITHUB_TOKEN with:

GITHUB_TOKEN: ${{ secrets.GH_TOKEN }}

az login and k8s deployment use AZURE_CREDENTIALS which is also defined as a repo secret.

Notes

• Since GitHub Actions Pipeline uses an ephemeral agent we need to define a backend to keep our terraform.tfstate.
• To use later in the pipeline we define multiple github_actions_variables.
• Since we have our Terraform configuration files in a dedicated folder, we need to define this path in the job environment for the steps which need to access to this folder to run. In a similar fashion we need to define k8s path to apply our Kubernetes manifest files.
• Our application needs the ports 30001-30002 open to be accessed. Since the NSG name of the AKS assigned randomly by Azure we assign it to a GitHub variable and add a rule to it in the pipeline.