GitOps operator

As explained in Automating API Delivery

A GitOps operator is software that continuously monitors a system and synchronizes it with desired configuration from a source such as a Git repository.

A GitOps operator continuously monitors a running system and a source of desired configuration, usually a Git repository. When it detects configuration drift—whether from a repository change or a manual system change—it retrieves the desired state and applies it to the target environment. section 9.4.1

A pull-based deployment uses the following operating model:

• Run the operator in the same environment or cluster as the deployed API gateway. section 9.4.1
• Monitor the Git repository and the running system for differences from the desired configuration. section 9.4.1
• Pull updated configuration and apply it to the target environment when a difference appears. section 9.4.1
• Use tools such as Argo CD or Flux for Kubernetes-based deployments. section 9.4.1

Detecting and correcting drift

A manual configuration change in an API gateway creates a difference from the Git repository. The operator detects the drift and reapplies the repository state, restoring the declared configuration. section 9.4.1

Figure 9.7 GitOps pull-based deployment model

Shows the pull-based GitOps deployment model, including the operator’s relationship to the repository, cluster, and deployed gateway. section 9.4.1

How Automating API Delivery covers it

How deep it goes

Explains monitoring, drift detection, state retrieval, application, placement, and security benefits without detailing operator implementation.

Examples

Uses manual gateway changes, decK diff, kubectl diff, Argo CD, and Flux as deployment examples.

What it assumes

Assumes familiarity with configuration repositories, running systems, API gateways, and deployment environments.

What you can do after

Operate pull-based deployments that detect configuration drift and synchronize an API gateway with Git-managed desired state.

How it connects

Connects configuration drift, Git repositories, API gateways, Kubernetes, and pull-based deployments.

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Also explained in

• 

  liveBookmanning.com
  Kubernetes for DevelopersA GitOps operator is a cluster-resident control loop that reconciles running resources with declarative configuration stored in a version-controlled repository.

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Related concepts

• ArgoCDincludes · Argo CD is a declarative GitOps continuous-delivery tool that deploys and synchronizes applications on Kubernetes from version-controlled configuration.
• pull-based deploymentimplements · A pull-based deployment is a deployment model in which an agent in or near the target environment retrieves and applies desired configuration changes.
• reconciliationimplements · Reconciliation is the process of comparing related states, records, or outputs to identify differences and, when needed, resolve them or bring them into agreement.

This explainer was generated by Manning's knowledge graph from the text of Automating API Delivery. The section links point to the parts of the book it draws on.