Argo CD application

As explained in Platform Engineering on Kubernetes

An Argo CD application is a declarative Argo CD resource that associates source configuration with a destination cluster and synchronizes Kubernetes resources.

An Argo CD application connects configuration in a Git repository to a destination Kubernetes cluster and synchronizes the declared resources there. Argo CD uses applications to represent environments; here, one application represents the staging environment for the Conference application. section 4.2 section 4.2.1

Configure an application by specifying:

• A name and Argo CD project, such as the default project. section 4.2.1
• A Git repository, revision, and path containing the environment configuration. section 4.2.1
• A destination cluster and namespace, with an option to create the namespace automatically. section 4.2.1
• Synchronization behavior and Helm parameters when the repository path contains a Helm chart. section 4.2 section 4.2.1

Staging environment

Create an application for the staging directory under chapter-4/argo-cd/staging/, select the desired branch or tag, target the cluster running Argo CD, and use the staging namespace. Argo CD can then sync the Helm-defined Conference application and show whether the environment is healthy. section 4.2.1

Figure 4.10 Argo CD will sync environments, configurations from Git to live clusters

Use the architecture figure to trace configuration from Git through Argo CD synchronization into live clusters. section 4.2

How Platform Engineering on Kubernetes covers it

How deep it goes

Explains creation through the UI, including source, revision, path, destination, namespace, synchronization, and Helm parameters.

Examples

Uses the Conference staging environment, a Git repository path, Helm configuration, and a destination cluster.

What it assumes

Requires an installed Argo CD instance and a Git repository containing environment configuration.

What you can do after

Operate Argo CD through its UI or CLI to configure, synchronize, and monitor a Kubernetes environment.

How it connects

Connects Git, Helm, Kubernetes clusters, namespaces, Kubernetes RBAC, and environment synchronization.

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Related concepts

• Kubernetes namespaceconfigures · A Kubernetes namespace is a logical cluster partition that scopes names and organizes, isolates, and controls access to namespaced resources.

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