GitOps automates Kubernetes delivery by keeping an approved, declarative description of the intended application and infrastructure state in a versioned source, then using software agents to compare that target with the live cluster and reconcile differences. A common setup separates CI—which builds and tests an image—from continuous delivery, where a cluster-side controller applies the configuration that selects the approved image and its settings.
What GitOps means
GitOps is a set of operating principles, not a single product. Its core ideas are to describe systems declaratively, version and preserve changes, have agents automatically pull the desired state, and continuously reconcile the system toward that state. Git is the canonical state store in the OpenGitOps glossary, though the principles can apply to other qualifying state stores. OpenGitOps principles and its glossary define the model.
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The defining feature is the feedback loop: a controller observes the cluster, compares actual resources with the declared target, and responds to differences according to its configuration and permissions. OpenGitOps summarizes the idea: “Software agents continuously observe actual system state and attempt to apply the desired state.” GitOps Principles
How Kubernetes deployments become automated
- A developer changes code or configuration. The change may be application code, a Kubernetes manifest, a Helm values file, or another declarative input.
- CI checks and packages the application. A build pipeline can run tests and publish a container image. The image is an artifact; on its own, it does not describe the cluster’s full desired state.
- An approved change selects the release. A versioned configuration change records the image reference and environment-specific settings. Teams can use review and promotion rules to decide which change is approved for each environment.
- A delivery controller reads and renders the declaration. Argo CD documents support for Kustomize, Helm, Jsonnet, plain YAML or JSON, and configured plugins. Flux uses source objects such as GitRepository, OCIRepository, HelmRepository, and Bucket, alongside controllers that reconcile Kubernetes resources. Argo CD overview · Flux concepts
- The controller compares desired and live state. It reports differences and, when configured and authorized, applies changes to move the cluster toward the declared target.
- Reconciliation continues after deployment. If a managed resource is changed directly in the cluster, a controller may later restore the declared configuration. This is not necessarily immediate: Flux documents a five-minute default reconciliation interval for a Kustomization, configurable through
.spec.interval. Flux Core Concepts
Does GitOps replace CI/CD?
Usually, GitOps supplies the continuous-delivery reconciliation loop; it does not have to replace the build-and-test part of CI. CI can create and publish an image, while a separate approved configuration change identifies the image for a particular environment. The cluster-side controller then applies that state. This division is a common architecture, not a requirement: teams can arrange the responsibilities differently. Argo CD and Flux describe delivery and reconciliation capabilities, not a mandate that every controller also build application code. Argo CD overview · Flux concepts
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Argo CD and Flux: what differs
Both are GitOps tools, but they expose different workflows and component models. The right choice depends on how a team wants to manage sources, visibility, access, and reconciliation—not on a universal ranking.
| Consideration | Argo CD | Flux |
|---|---|---|
| Operating model | Documents an API server, repository server, and application controller, with status visualization and a web UI and CLI. Argo CD architecture | A composable toolkit of source and reconciliation controllers, configured through Kubernetes APIs. Flux concepts |
| Configuration and sources | Lists Kustomize, Helm, Jsonnet, plain manifests, and configured plugins. Argo CD overview | Documents Git, OCI, Helm repository, and bucket source types. Flux concepts |
| Applying changes | Supports manual or automatic sync; corrective action depends on configuration. Argo CD architecture | Kustomization reconciliation has a documented five-minute default interval, adjustable with .spec.interval. Flux Core Concepts |
| Visibility and access | Documents multi-cluster support, RBAC, health reporting, lifecycle hooks, and health analysis. These features still require appropriate configuration. Argo CD overview | Teams should assess how its controllers, Kubernetes resources, credentials, and operational ownership fit their access and monitoring requirements. The cited concepts documentation describes its composable controller model. Flux concepts |
| Progressive delivery | Documents lifecycle hooks and health analysis; check the required integrations and release process for your use case. Argo CD overview | Distinguishes progressive delivery from ordinary continuous delivery; verify the additional components and policies your rollout requires. Flux concepts |
What GitOps does not guarantee
- A successful or safe rollout. Invalid configuration, unavailable resources, permissions, application health, and rollout strategy can all affect the result. Retries, rollback, or alerts are policy-dependent responses, not automatic guarantees. OpenGitOps glossary
- That every commit should go to production. Teams still need to define review, testing, approval, and promotion policies. A Git commit records a change; it does not make the change correct.
- Protection from a wrong declaration. Reconciliation can correct manual drift, but if the desired configuration is itself wrong, automation can keep applying the wrong target. OpenGitOps glossary
- Security without access controls. Pull-based delivery can reduce the need for an external CI runner to push directly into a cluster, but repository credentials and controller permissions still need careful management. Argo CD documents credential management and RBAC in its architecture. Argo CD architecture
- Recreation of persistent application data. Kubernetes declarations describe configuration; they do not ordinarily contain the application’s persistent data. Data backup and recovery remain separate operational concerns. OpenGitOps glossary
How to assess a GitOps setup
- Decide which system is authoritative for each environment and how a change is reviewed and promoted.
- Make the boundary between image build and deployment configuration explicit, so teams can trace which artifact a release uses.
- Review controller permissions, repository credentials, identity integration, RBAC, and tenancy boundaries against the clusters it manages.
- Choose reconciliation intervals and drift behavior that fit the workload, and define when operators may suspend or manually intervene.
- Specify how rollout health is evaluated and what happens when a change fails: retry, alert, rollback, or a human decision.
- Keep persistent-data backup and recovery plans distinct from the Kubernetes configuration workflow.
Further reading
The 2021 book GitOps and Kubernetes: Continuous Deployment with Argo CD, Jenkins X, and Flux is listed by its publisher as a 344-page Manning title published March 23, 2021. Its tool details may not reflect current versions, so use official project documentation for present-day behavior. Publisher listing. For historical context, the CNCF published an overview of GitOps on September 28, 2021; it is not a current product manual or a measured guarantee of outcomes. CNCF GitOps overview
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