GitOps Explained: Declarative Delivery with Argo CD and Flux
GitOps sounds like a buzzword until you see what it fixes: drift, mystery changes, and deployments nobody can audit. Here is the model, the tools, and when it is worth it.
- GitOps makes a Git repository the single source of truth for what should be running. You declare the desired state in Git, and an agent inside the cluster continuously reconciles reality to match it.
- Argo CD and Flux are the two dominant tools. Argo CD leans on a rich UI and a strong application model; Flux is lighter, more modular and composes cleanly with other tooling.
- GitOps shines on Kubernetes and pays off in auditability, easy rollbacks and no configuration drift. It is a weaker fit outside Kubernetes and adds real overhead for very small setups.
- Start small: reconcile one non-critical app, get a secrets plan in place, and expand only once the pull-and-reconcile workflow feels natural to the team.
GitOps is a way of running deployments where a Git repository holds the desired state of your system and software keeps the running system matched to it. Instead of a pipeline pushing changes into your cluster from the outside, an agent inside the cluster pulls the desired state from Git and continuously reconciles reality against it. Every change is a commit with an author, a reason and a timestamp, so you get a full audit trail and roll back by reverting. In short, Git becomes the single source of truth for what should be running.
This post explains the model in plain terms, compares Argo CD and Flux honestly, and is candid about where GitOps earns its keep and where it just adds moving parts. It sits on top of your delivery pipeline rather than replacing it; if your build and test stages are shaky, sort those first with our guide to CI/CD pipeline best practices.
What GitOps Actually Means
GitOps is the practice of describing your entire desired system state in Git and letting software keep the running system matched to it. The idea rests on a few principles that sound abstract until you see the failure modes they remove.
- Declarative: you describe what the system should look like, not the steps to get there. The manifests in Git are the target, not a script.
- Versioned and immutable: Git is the single source of truth, so every change is a commit with an author, a reason and a timestamp you can audit and revert.
- Pulled automatically: an agent running inside the cluster pulls the desired state from Git rather than a pipeline pushing in from outside.
- Continuously reconciled: the agent constantly compares desired state to actual state and corrects any difference, so drift is detected and healed instead of quietly accumulating.
The mental shift is from pushing changes at a cluster to declaring what should be true and letting a reconciler make it so.
Why Teams Move to GitOps
Teams adopt GitOps because each of its benefits maps to a specific pain that push-based deployment tends to create at scale. Together they change how calm your operations feel.
- A real audit trail: every change to production is a Git commit, so "who changed what and when" is answered by git log rather than guesswork.
- Trivial rollbacks: reverting a bad deploy is reverting a commit, and the reconciler brings the cluster back to the previous known-good state.
- No configuration drift: because the agent continuously reconciles, manual hotfixes and out-of-band changes get detected and, if you want, automatically reverted.
- A cleaner security posture: the cluster pulls from Git, so your CI system does not need broad, standing credentials to push into production.
- Consistency across environments: the same declarative approach describes dev, staging and production, so promoting a change is a well-understood, reviewable operation.
Argo CD vs Flux: The Honest Comparison
Argo CD and Flux both implement GitOps well and are both mature, CNCF-graduated and safe choices. They differ in philosophy more than in capability, so the right pick usually comes down to how your team likes to work rather than a feature checklist.
| Dimension | Argo CD | Flux |
|---|---|---|
| Core model | Strong Application concept, opinionated | Composable controllers you assemble |
| Interface | Rich web UI for sync and health | CLI and Kubernetes-native resources |
| Onboarding | Guided on-ramp for GitOps newcomers | Toolkit feel, suits platform teams |
| Helm and Kustomize | Supported | Supported |
| Multi-cluster | Supported | Supported |
| Best for | Teams wanting a clear operational dashboard | Teams wanting GitOps to extend the cluster natively |
Do not agonize over this choice. Either tool will serve you well; picking the one your team finds more intuitive matters more than any single feature difference.
Not Sure GitOps Fits Your Stack?
Tell us what you are deploying and how your team ships today, and we will give you a straight answer on whether GitOps with Argo CD or Flux will actually help or just add moving parts.
How GitOps Relates to Infrastructure as Code
In practice many mature teams use both, with clear ownership of which layer lives where. Our guide to infrastructure as code with Terraform covers provisioning the platform that a GitOps workflow then deploys onto.
| Aspect | Infrastructure as Code | GitOps |
|---|---|---|
| Primary job | Provision the platform and cloud resources | Deploy and reconcile in-cluster workloads |
| Execution model | Push, applied through a pipeline | Pull and continuously reconcile |
| Typical scope | Clusters, networks, databases | Applications, config, manifests |
| Change trigger | Run apply when you change infra | Agent detects Git changes automatically |
How to Adopt GitOps Step by Step
The safest way to adopt GitOps is to prove it on one workload before touching the rest of your estate. Follow this order so the learning curve stays contained.
- Pick a single non-critical application with a manageable blast radius as your pilot.
- Move that application's manifests into a Git repository and make it the source of truth.
- Install Argo CD or Flux and connect it to that repository.
- Let the agent reconcile the app, then watch how drift detection and rollbacks behave.
- Add a secrets strategy such as sealed-secrets or external-secrets before you go wider.
- Wire the reconciler into a deliberate rollout pattern for safe promotion to users.
- Expand to more services gradually, only once the pull-and-reconcile workflow feels natural.
Where GitOps Is Not the Right Fit
Two caveats apply even when the fit is strong. Secrets need a real plan because plaintext secrets do not belong in Git, and the GitOps agent itself is a new operational component to own and upgrade. Pair adoption with a deliberate rollout approach; our overview of Kubernetes deployment strategies covers the patterns GitOps tools can drive.
| Scenario | GitOps Fit | Why |
|---|---|---|
| Kubernetes at real scale | Strong | Turnkey tooling, drift and rollback handled well |
| Plain VMs or serverless | Weak | Ecosystem is thin, more friction than payoff |
| Single small service, rare deploys | Marginal | A simple push pipeline is often less to run |
| Regulated, audit-heavy delivery | Strong | Every change is an auditable commit |
| Team with no Kubernetes experience | Deferred | Learn the platform first, then add GitOps |
Common Mistakes Teams Make with GitOps
Most GitOps pain comes from adoption habits rather than the model itself. These are the patterns we see trip teams up most often.
- Converting the whole estate at once instead of proving the workflow on one non-critical app first.
- Committing plaintext secrets to Git rather than adopting sealed-secrets or an external-secrets approach up front.
- Leaving manual kubectl access wide open, so people keep making out-of-band changes that fight the reconciler.
- Choosing between Argo CD and Flux on a feature checklist instead of on how the team actually likes to work.
- Forcing GitOps onto non-Kubernetes workloads where the tooling is thin and the friction outweighs the benefit.
- Treating the GitOps agent as install-and-forget rather than a component that needs owning, monitoring and upgrading.
The teams that succeed treat the first few weeks as learning, because moving from pushing changes to declaring desired state takes adjustment even for strong engineers.
How Acqurio Tech Approaches GitOps
We start by asking whether GitOps is even the right call for your stack, because the honest answer is sometimes no. When it fits, we pilot it on one workload, get a secrets and access model in place early, and pick Argo CD or Flux based on how your team works rather than on hype. We deliver remotely from India with an engineered overlap window so reviews and cutovers happen alongside your team, and we frame any compliance considerations as general guidance for your own experts to confirm. The goal is a delivery workflow your engineers can own after we hand it over, not a black box.
Conclusion
GitOps is not hype once you have felt the problems it removes: silent drift, unauditable changes, and rollbacks that turn into archaeology. By making Git the single source of truth and letting an in-cluster agent continuously reconcile reality to it, you get a clear audit trail, easy reverts and a stronger security posture. Argo CD and Flux are both excellent, so choose the one your team finds more natural rather than overthinking it. Just be honest about the fit: GitOps earns its keep on Kubernetes at real scale, and adds overhead where that scale is not there yet. If you want help deciding or a hand setting it up cleanly, contact us and we will point you the right way.
Frequently asked questions
What is GitOps, explained simply?
GitOps is a way of running deployments where a Git repository holds the desired state of your system and software keeps the running system matched to it. Instead of a pipeline pushing changes into your cluster from the outside, an agent inside the cluster pulls the desired state from Git and continuously reconciles reality to it. Every change is a Git commit, so you get a full audit trail and can roll back by reverting a commit. In short, Git becomes the single source of truth for what should be running.
What is the difference between Argo CD and Flux?
Argo CD and Flux are the two leading GitOps tools and both are mature and widely trusted. Argo CD ships with a rich web UI and a strong application model, which makes it an easy on-ramp for teams that want a clear visual dashboard of sync and health status. Flux is lighter and more modular, built from composable controllers that suit teams who prefer a toolkit that integrates natively with the cluster. Both support Helm, Kustomize and multi-cluster setups, so the choice is mostly about which workflow your team finds more intuitive.
How is GitOps different from a normal CI/CD pipeline?
A traditional CI/CD pipeline usually pushes changes into your environment: it builds, tests and then calls out to the cluster to apply the deployment. GitOps inverts the deployment step so an agent inside the cluster pulls the desired state from Git and reconciles it continuously. Your CI pipeline still builds and tests and updates the manifests in Git, but it no longer needs standing credentials to push into production. So GitOps does not replace CI/CD; it changes how the delivery half works and hands the build half back to your existing pipeline.
Is GitOps only for Kubernetes?
GitOps grew up around Kubernetes and that is where the tooling, especially Argo CD and Flux, is strongest and most turnkey. You can apply the underlying principles outside Kubernetes, but the ecosystem is much thinner and the effort often outweighs the benefit for virtual machines or serverless setups. If your workloads run on Kubernetes, GitOps is a natural and well-supported fit. If they do not, weigh the overhead carefully before adopting it, because you may be fighting the tools rather than being helped by them.
Is GitOps secure, and how are secrets handled?
GitOps can improve your security posture because the cluster pulls from Git rather than your CI system holding broad, standing credentials to push into production. The main thing to plan for is secrets, because you never want plaintext secrets committed to Git. Teams typically add a sealed-secrets or external-secrets approach so sensitive values are encrypted or referenced rather than stored in the clear. Treat access control as part of the design too, since leaving manual cluster access wide open lets people make out-of-band changes that fight the reconciler.
How should we start with GitOps without disrupting production?
Begin with a single non-critical application rather than converting everything at once. Put that application's manifests in a Git repository, install Argo CD or Flux, and let it reconcile just that one workload while you watch how drift detection and rollbacks behave. Once the workflow feels natural and you have a secrets strategy in place, expand to more services gradually. Treat the first few weeks as a learning period, because the shift from pushing changes to declaring desired state takes a little adjustment even for experienced teams.
Do we still need infrastructure as code if we use GitOps?
Yes, they solve different layers and work well together. Infrastructure as code with a tool like Terraform provisions the underlying platform such as clusters, networks and databases, usually through a push-based pipeline. GitOps governs the application layer running on top, continuously reconciling in-cluster workloads against Git. Many mature teams use both with clear ownership of which layer lives where, so infrastructure as code stands up the platform and GitOps deploys and maintains what runs on it.