- A
Use managed identity for GitHub Actions and assign it to the AKS cluster
Why wrong: GitHub Actions does not support managed identity directly; it uses OpenID Connect or service principals.
- B
Store the service principal credentials in a Kubernetes secret in the AKS cluster
Why wrong: Kubernetes secrets are for pod access, not for workflow authentication.
- C
Store the service principal credentials as GitHub Actions secrets and reference them in the 'azure/login' action
Secrets are encrypted and can be used securely with the 'azure/login' action.
- D
Store the service principal credentials as environment variables in the workflow file
Why wrong: Environment variables can be exposed in logs and are not encrypted.
Question 746 of 928
GitHub Actions AKS Service Principal Credentials
This AZ-400 practice question tests your understanding of design and implement build and release pipelines. Match the stated requirement to the specific cloud service, access model, or configuration option — many options are valid in isolation but not for this scenario. After answering, compare your reasoning against the explanation and wrong-answer breakdown below. Once you have made your selection, read the full explanation to reinforce the concept and understand why each distractor is designed to mislead on exam day.
You are setting up a GitHub Actions workflow to deploy a containerized application to Azure Kubernetes Service (AKS). You need to securely authenticate to the AKS cluster using a service principal. What is the recommended way to store and use the service principal credentials?
Answer choices
Why each option matters
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Store the service principal credentials as GitHub Actions secrets and reference them in the 'azure/login' action
Option C is correct because GitHub Actions secrets are the recommended secure mechanism for storing sensitive credentials like a service principal's client ID and secret. The 'azure/login' action can directly reference these secrets (e.g., `${{ secrets.AZURE_CREDENTIALS }}`) to authenticate to Azure, and then the 'azure/aks-set-context' action uses that authenticated session to connect to the AKS cluster. This approach avoids hardcoding credentials in the workflow file and leverages GitHub's encrypted storage.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Use managed identity for GitHub Actions and assign it to the AKS cluster
Why it's wrong here
GitHub Actions does not support managed identity directly; it uses OpenID Connect or service principals.
- ✗
Store the service principal credentials in a Kubernetes secret in the AKS cluster
Why it's wrong here
Kubernetes secrets are for pod access, not for workflow authentication.
- ✓
Store the service principal credentials as GitHub Actions secrets and reference them in the 'azure/login' action
Why this is correct
Secrets are encrypted and can be used securely with the 'azure/login' action.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
Store the service principal credentials as environment variables in the workflow file
Why it's wrong here
Environment variables can be exposed in logs and are not encrypted.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates may confuse storing credentials in Kubernetes secrets (which is valid for in-cluster applications) with the initial authentication needed from an external CI/CD system, or they may think managed identities can be directly assigned to GitHub Actions runners, which is not supported.
Detailed technical explanation
How to think about this question
Under the hood, the 'azure/login' action uses the Azure CLI's `az login --service-principal` command with the provided credentials to obtain an OAuth 2.0 access token from Azure AD. This token is then used by subsequent actions like 'azure/aks-set-context' to run `az aks get-credentials`, which merges the cluster's kubeconfig into the runner's environment. In a real-world scenario, you would store the entire service principal JSON output (including tenant ID, client ID, and client secret) as a single GitHub secret named `AZURE_CREDENTIALS` and reference it directly in the action.
KKey Concepts to Remember
- Read the scenario before looking for a memorised answer.
- Find the constraint that changes the correct option.
- Eliminate answers that are true in general but not in this case.
TExam Day Tips
- Watch for words such as best, first, most likely and least administrative effort.
- Review why wrong options are wrong, not only why the correct option is correct.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
How this comes up in practice
A media company stores terabytes of video archives that are accessed once a year for audit purposes. Moving these objects to a cold storage tier (Azure Archive, S3 Glacier, or Google Nearline) costs a fraction of hot storage. Questions like this test whether you understand storage tiers, access frequency tradeoffs, and retrieval latency requirements.
What to study next
Got this wrong? Here's your next step.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
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FAQ
Questions learners often ask
What does this AZ-400 question test?
Design and implement build and release pipelines — This question tests Design and implement build and release pipelines — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Store the service principal credentials as GitHub Actions secrets and reference them in the 'azure/login' action — Option C is correct because GitHub Actions secrets are the recommended secure mechanism for storing sensitive credentials like a service principal's client ID and secret. The 'azure/login' action can directly reference these secrets (e.g., `${{ secrets.AZURE_CREDENTIALS }}`) to authenticate to Azure, and then the 'azure/aks-set-context' action uses that authenticated session to connect to the AKS cluster. This approach avoids hardcoding credentials in the workflow file and leverages GitHub's encrypted storage.
What should I do if I get this AZ-400 question wrong?
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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Last reviewed: Jul 4, 2026
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