GitOps with Argo CD · Module 03

Argo CD at Scale

Manage many applications and clusters: the app of apps pattern, ApplicationSets and generators, registering clusters, AppProjects as guard rails, and progressive delivery with Argo Rollouts.

Practice interactively →

What you will learn

• Bootstrap a cluster with an app of apps and manage Applications as files in Git
• Generate Applications with ApplicationSets (list, cluster, Git and matrix generators)
• Register clusters and restrict teams with AppProjects and sync windows
• Release with canary or blue-green using Argo Rollouts and metric analysis

Lessons

1. The app of apps pattern

   A root Application points at a folder of Application manifests, so one sync creates and manages every other app — and the Argo CD setup itself lives in Git.

2. ApplicationSets and generators

   An ApplicationSet uses a generator (list, cluster, Git, matrix) to produce parameters and stamps out one Application per set from a template.

3. Multiple clusters and AppProjects

   One Argo CD can deploy to many clusters registered as Secrets; AppProjects set the guard rails — which repos, clusters, namespaces and resource kinds a team may use.

4. Progressive delivery with Argo Rollouts

   Argo Rollouts replaces a Deployment with a Rollout that shifts traffic step by step (canary) or switches a preview stack (blue-green), and can roll back on bad metrics.