DevOps / GitHub Actions Interview Questions

What are reusable workflows in GitHub Actions and how do you call them?

A reusable workflow is a standard workflow file that exposes a workflow_call trigger, making it callable from other workflows. This lets you centralise a common CI/CD pattern (e.g. build-and-push, deploy-to-kubernetes) in one place and have many repositories or workflows invoke it without copy-pasting YAML.

Defining a reusable workflow (.github/workflows/deploy-template.yml in the shared repo):

on:
  workflow_call:
    inputs:
      environment:
        required: true
        type: string
    secrets:
      DEPLOY_KEY:
        required: true

jobs:
  deploy:
    runs-on: ubuntu-latest
    steps:
      - uses: actions/checkout@v4
      - run: ./deploy.sh ${{ inputs.environment }}
        env:
          DEPLOY_KEY: ${{ secrets.DEPLOY_KEY }}

Calling the reusable workflow from another workflow:

jobs:
  call-deploy:
    uses: my-org/shared-workflows/.github/workflows/deploy-template.yml@main
    with:
      environment: production
    secrets:
      DEPLOY_KEY: ${{ secrets.PROD_DEPLOY_KEY }}

Key rules to remember:

A reusable workflow is called as a job, not a step — so it can run in parallel with or be sequenced using needs: like any other job.
Secrets are not automatically inherited; you must explicitly pass them or use secrets: inherit to forward all caller secrets.
A caller workflow can nest reusable workflows up to 4 levels deep.
Outputs declared in the reusable workflow are available to the calling workflow via needs.<job>.outputs.<name>.

Take quiz

Which on: trigger must a workflow declare to be callable as a reusable workflow? workflow_dispatch

✗ Try again — not quite right.

workflow_run

✗ Try again — not quite right.

workflow_call

✓ Well done — that is correct!

repository_dispatch

✗ Try again — not quite right.

In the calling workflow, at what level (job or step) is a reusable workflow referenced? Step level using uses: inside steps:

✗ Try again — not quite right.

Job level using uses: on the job definition

✓ Well done — that is correct!

Workflow level using calls: at the top

✗ Try again — not quite right.

Step level using workflow: inside steps:

✗ Try again — not quite right.

More Related questions...

What is GitHub Actions and what problems does it solve? What are the key components of GitHub Actions — workflows, jobs, steps, actions, and runners? How is a GitHub Actions workflow file structured, and where must it be placed? What are workflow triggers (on:) and which event types does GitHub Actions support? What is the difference between push, pull_request, and workflow_dispatch triggers? What are jobs in GitHub Actions, and how do they run in parallel by default? What are steps, and what is the difference between run: and uses: in a step? What are runners, and what is the difference between GitHub-hosted and self-hosted runners? What is the GitHub Actions Marketplace and how do you find and use actions from it? How do you use the actions/checkout action and what does it do? How do you pass environment variables and secrets to a GitHub Actions workflow? What is the difference between the env:, secrets:, and vars: contexts in GitHub Actions? How do you cache dependencies in GitHub Actions using actions/cache? How do you use matrix builds in GitHub Actions to test across multiple environments? How do you control job execution order in GitHub Actions using needs:? How do you share data between steps within a job using step outputs? How do you share build artifacts between jobs using actions/upload-artifact and actions/download-artifact? What are reusable workflows in GitHub Actions and how do you call them? What are composite actions and when should you choose them over reusable workflows? How do you set up a Docker container service for integration tests using services: in GitHub Actions? How do you use conditional steps with if: in GitHub Actions? What are the key GitHub Actions expression contexts and what information does each provide? How do you use concurrency groups to cancel outdated workflow runs in GitHub Actions? What is the GITHUB_TOKEN and what permissions does it have? How do you trigger one GitHub Actions workflow from another using workflow_run? How do you write a custom JavaScript action for GitHub Actions? How do you write a custom Docker container action for GitHub Actions? How do you implement a complete CI/CD pipeline for a container image in GitHub Actions — build, push to a registry, and deploy? How do you implement path filtering so a workflow only runs when specific files change? How do you debug failing GitHub Actions workflows — enabling debug logging and using tmate? How do you implement branch protection rules with required GitHub Actions status checks? How do you handle large monorepos with multiple services in GitHub Actions? What are OpenID Connect (OIDC) tokens in GitHub Actions and how do they replace long-lived cloud credentials? How do you prevent secret exposure and follow security hardening best practices in GitHub Actions? What are the key differences between GitHub Actions, Jenkins, and GitLab CI?

Show more question and Answers...

GitOps Interview Questions

Comments & Discussions

Maven Interview questions 45 Maven Interview questions II 46 Gradle interview questions 31 GIT Interview Questions 46 DEVOPS Interview questions 4 Jenkins Interview questions 22 AppDynamics Interview questions 58 GitHub Actions Interview Questions 35 GitOps Interview Questions 35 ArgoCD interview questions 29 GitLab CI Basics Interview Questions 40 Ansible Interview questions 50 Bamboo: Continuous Integration & Deployment Interview Questions 50 Gradle8 Interview Questions 50 Apache Groovy Interview questions 50 BeanShell Interview questions 50

Recently added questions

What is parameter binding in MyBatis? How do you integrate MyBatis with Spring Boot? What is a SqlSessionFactory in MyBatis? How do you write a basic SELECT statement in MyBatis? What is the difference between #{} and ${} in MyBatis? What is MyBatis-Spring? What is MyBatis? What is the difference between MyBatis and Hibernate? What is a Mapper interface in MyBatis? What is a Mapper XML file? What is result mapping? What are the supported statement types in MyBatis? What is a resultMap? How do you configure a data source in MyBatis? What is the mybatis-config.xml file used for? Explain how pagination is typically implemented in MyBatis? What is the purpose of MyBatis? What are the key features of MyBatis? What is a SqlSession in MyBatis? What is dynamic SQL in MyBatis?

	Interviews Questions Java Spring Hibernate DevOps Testing API BigData Web Erlang AI Database Integration Cloud Python Scala Tools Golang SAP	About Javapedia.net Javapedia.net is for Java and J2EE developers, technologist and college students who prepare of interview. Also this site includes many practical examples. This site is developed using J2EE technologies by Steve Antony, a senior Developer/lead at one of the logistics based company. Follow Javapedia updates
	contact: javatutorials2016[at]gmail[dot]com
Kindly consider donating for maintaining this website. Thanks.
	Copyright © 2026, javapedia.net, all rights reserved. Privacy Policy · Terms of Service.