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GitOps automates Kubernetes delivery by keeping an application’s intended configuration in a versioned state source and using software agents in or near the cluster to apply and continually reconcile that state. A typical setup separates continuous integration (building and testing an image) from continuous delivery (approving the image and configuration for an environment, then reconciling them to the cluster). GitOps is a set of operating principles, not one product or a guarantee that every release will be safe.
What is GitOps?
GitOps is a way to manage infrastructure and application delivery through declarative configuration. Instead of treating a sequence of manual deployment commands as the source of truth, a team records the intended state—such as Kubernetes manifests, Helm values, or Kustomize overlays—in a versioned source. An agent retrieves that declaration, compares it with the live cluster, and works to bring the cluster into alignment.
OpenGitOps describes four principles: systems are declarative; desired state is versioned and immutable; software agents automatically pull that state; and agents continuously reconcile actual state with desired state. Git is the canonical state store in the project’s glossary, although the principles allow a qualifying state store other than Git. OpenGitOps principles and the OpenGitOps glossary define the terms.
The important distinction is between declaring a target and continuously enforcing it. A repository records what should run; reconciliation is the ongoing process that observes what is running and responds to differences. It is not necessarily instantaneous.
#1 Best Overall
How does GitOps automate a Kubernetes deployment?
A common workflow connects application changes to a cluster without making the CI system responsible for directly pushing every release. The exact division of work depends on the team and its tools.
- Change the application or its deployment configuration. A developer changes code, Kubernetes resources, or environment-specific settings.
- Build and test the artifact. A CI system can run checks, build a container image, and publish it. The image is an artifact, not the complete desired state of the Kubernetes cluster.
- Approve the environment change. A versioned configuration change identifies the image and settings intended for a target environment. A review or promotion policy can determine when that change is approved.
- Retrieve and render the declaration. A delivery controller obtains the configuration and turns it into Kubernetes resources. 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, with controllers that consume and reconcile them. See the Argo CD overview and Flux concepts.
- Compare desired and live state. The controller detects whether the cluster differs from the rendered declaration and reports status or drift.
- Apply corrective changes when configured and authorized. Depending on sync and permission settings, the controller may update managed resources to match the declared target.
- Continue reconciling. If a managed object is changed manually, a later reconciliation can restore the declared configuration. Flux documents a five-minute default interval for Kustomization reconciliation; the interval is configurable, so this is not a universal GitOps timing guarantee. Flux Core Concepts
OpenGitOps summarizes the loop this way: “Software agents continuously observe actual system state and attempt to apply the desired state.” That describes an attempt to converge, not a promise that an application will become healthy or that every rollout will succeed. Invalid configuration, missing permissions, resource availability, application health, and rollout strategy can all affect the outcome. Responses such as retries, rollback, or alerts depend on the system’s policies. OpenGitOps Principles and the glossary
Does GitOps replace CI/CD?
GitOps does not have to replace CI. CI commonly builds, tests, and publishes application artifacts; a GitOps delivery controller commonly handles the continuous-delivery reconciliation loop. An approved configuration change can connect the two by recording which artifact and settings should run in a given environment.
This separation is a common architecture, not a mandatory rule. Some pipelines combine responsibilities differently, but a GitOps controller should not be assumed to build or test application code simply because it deploys Kubernetes resources. The Argo CD overview and Flux concepts describe their delivery and reconciliation roles.
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Argo CD and Flux: what is the difference?
Argo CD and Flux are examples of GitOps tooling, not interchangeable names for one architecture. Both support continuous reconciliation, but their documented components and interaction models differ. Product features and documentation can change; consult the current project documentation when choosing versions or configuring a deployment.
| Area | Argo CD | Flux |
|---|---|---|
| Organization | Documents an API server, repository server, and application controller. | A composable toolkit of source and reconciliation controllers, configured through Kubernetes APIs. |
| Workflow and visibility | Documents a web UI, CLI, status visualization, and manual or automatic sync. | Organizes operations around controllers and custom resources rather than the same documented UI-centered workflow. |
| Configuration and sources | Lists Kustomize, Helm, Jsonnet, plain YAML or JSON, and configured plugins. | Documents sources including Git, OCI, Helm repositories, and buckets. |
| Reconciliation controls | Supports optional corrective action and automatic or manual sync; review sync behavior and authorization for the chosen setup. | Kustomization has a documented five-minute default reconciliation interval, configurable through .spec.interval. |
| Scale and access | Lists multi-cluster support and RBAC; these features do not ensure a secure configuration by themselves. | Evaluate tenancy boundaries, identity, source credentials, controller permissions, and operational ownership for the specific installation. |
| Release health and rollout | Documents lifecycle hooks and health analysis. | Defines progressive delivery separately from ordinary continuous delivery. |
Sources: Argo CD architecture, Argo CD overview, and Flux concepts. Rather than selecting a universal winner, compare the workflow, visibility, integrations, permissions, and operational ownership your team actually needs.
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Traceability and review
Versioned configuration makes intended changes easier to inspect and relate to a deployment. Teams can require review or approval before a configuration change becomes the target for an environment. A Git commit alone is not a safe production-release policy: approval, testing, and promotion rules remain choices the team must define. A 2021 CNCF overview describes approved pull-request changes and auditability as part of the approach; it is historical context, not a measured guarantee of reliability or productivity.
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Because reconciliation compares the live cluster with declared state, a controller can detect and respond to an out-of-band edit. That is useful for keeping managed resources aligned, but it also means a mistaken declaration can be applied repeatedly. The desired state must be reviewed and corrected when it is wrong.
Access boundaries
Pull-based delivery can reduce the need for an external CI runner to push directly into a cluster. It does not remove the need to protect repository credentials or limit the permissions of the in-cluster controller. Argo CD’s architecture documentation covers repository and cluster credential management and RBAC; teams still need to configure those controls appropriately.
Application data and health
Kubernetes declarations describe configuration and resources, not necessarily the persistent data created or changed by an application. OpenGitOps’ glossary notes that desired configuration generally excludes persistent application data, though it may include credentials or recovery-tool configuration. GitOps also does not by itself establish that a rollout is healthy; monitoring, health checks, rollout policies, and decisions about failed releases remain necessary.
How to assess a GitOps setup
Before adopting or expanding a controller, evaluate the workflow end to end rather than treating installation as the finish line.
The Tool Desk
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- Build-to-release handoff: Decide how a tested artifact’s immutable identity and environment settings enter the desired configuration.
- Sync policy: Establish whether changes sync automatically or manually, how often sources refresh, and who can authorize corrective action.
- Drift and recovery: Decide how direct edits are handled and how to pause, correct, or roll back a bad declaration.
- Security: Review repository credentials, cluster credentials, controller permissions, RBAC, and tenancy boundaries.
- Health and progressive delivery: Define health signals, rollout safeguards, alerting, hooks or progressive-delivery integrations, and ownership of failed releases.
For background beyond the project documentation, Manning’s GitOps and Kubernetes was published March 23, 2021, and its publisher lists 344 pages; its tool descriptions may not reflect current versions. Publisher listing
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