DevOps / ArgoCD interview questions

What is GitOps and how does ArgoCD implement it?

GitOps is an operational framework that uses Git as the single source of truth for infrastructure and application configuration. All desired states are stored as code in a Git repository, and automated agents continuously reconcile the live system to match what is in Git. Changes are made exclusively through Git operations (commits, pull requests, merges) rather than direct cluster access.

ArgoCD implements GitOps through its Application CRD and reconciliation loop. You define an Application that points to a Git repository path (Helm chart, Kustomize overlay, plain YAML, or Jsonnet) and a target cluster/namespace. The ArgoCD controller runs a continuous reconciliation loop — by default every 3 minutes, or immediately on Git webhook — comparing the rendered manifests from Git against the live cluster resources.

When differences are found, ArgoCD marks the application as OutOfSync. With automated sync enabled (syncPolicy.automated), it applies the Git state to the cluster automatically. With manual sync, an operator triggers the sync explicitly. Either way, the Git repo remains the authoritative record: to roll back, you revert the Git commit and ArgoCD reconciles back to the previous state.

The four GitOps principles ArgoCD satisfies are: declarative configuration, versioned and immutable state, pulled automatically by software agents, and continuously reconciled.

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In GitOps, how should an operator roll back a failed deployment?Revert the Git commit; the ArgoCD agent reconciles the cluster back to the previous state

✓ Well done! Reverts in Git are the canonical rollback mechanism in GitOps.

Run kubectl rollout undo directly against the cluster

✗ Try again — direct cluster changes create drift and bypass the Git audit trail.

Delete the ArgoCD Application and recreate it from a backup

✗ Try again — deleting the Application removes ArgoCD tracking and is not a rollback pattern.

What is the default interval at which ArgoCD polls Git for changes?Every 30 seconds

✗ Try again — 30 seconds is too frequent; the default is 3 minutes.

Every 3 minutes

✓ Well done! ArgoCD polls Git every 3 minutes by default, though webhooks can trigger immediate refreshes.

Every 10 minutes

✗ Try again — 10 minutes is not the default poll interval.

Only when a webhook is received

✗ Try again — ArgoCD polls on a schedule even without webhooks configured.

More Related questions...

What is ArgoCD and what problem does it solve? What is GitOps and how does ArgoCD implement it? What are the core components of ArgoCD? What is an ArgoCD Application and what fields does its manifest require? What are the different application sync statuses in ArgoCD? How do you install ArgoCD on a Kubernetes cluster? What is an ArgoCD Project and how does it differ from a Kubernetes namespace? How does ArgoCD support Helm charts? How does ArgoCD support Kustomize? What is self-healing in ArgoCD and how do you enable it? What is the difference between ArgoCD automated sync and self-healing? How does ArgoCD handle resource pruning and what risks does enabling it carry? What is the ArgoCD App of Apps pattern and when should you use it? How do ArgoCD Sync Waves and Sync Hooks work together to control deployment ordering? What is an ArgoCD ApplicationSet and how does the Git generator work? How does ArgoCD integrate with external secret management tools like Vault or Sealed Secrets? How do you configure ArgoCD RBAC and what are the built-in roles? What is ArgoCD Image Updater and how does it automate container image updates? How does ArgoCD manage multiple clusters and what are the methods for registering them? What are ArgoCD Sync Windows and how do you configure them? How does ArgoCD handle ignoreDifferences and when should you use it? What are ArgoCD resource health checks and how do you write a custom one? How does ArgoCD handle SSO and what identity providers does it support? What is the ArgoCD CLI and what are the most common commands used day-to-day? How does ArgoCD compare to Flux and when would you choose one over the other? What is server-side apply in ArgoCD and why might you enable it? How does ArgoCD handle notifications and what channels does it support? How do you perform a rollback in ArgoCD? What is the ArgoCD repository server caching strategy and how does it affect performance?

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DevOps / ArgoCD interview questions

What is GitOps and how does ArgoCD implement it?

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