argocd-gitops

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SKILL.md (first lines)

# ArgoCD GitOps

Implement declarative continuous delivery for Kubernetes with ArgoCD.

## When to Use This Skill

Use this skill when:
- Implementing GitOps workflows for Kubernetes
- Automating deployments from Git repositories
- Managing multiple environments declaratively
- Implementing progressive delivery strategies
- Synchronizing cluster state with Git

## Prerequisites

- Kubernetes cluster with ArgoCD installed
- kubectl configured
- Git repository for manifests
- ArgoCD CLI (optional)

Pin and review an Argo CD release manifest before applying it; the moving stable URL below is illustrative. Confirm cluster context and namespace, retain bootstrap secrets outside assistant output, rotate the admin credential and configure scoped SSO/RBAC. Start with an application diff and manual sync. Automated prune deletes resources and self-heal reverts emergency edits; enable these only after an approved reconciliation/rollback policy. A Git revert is normally the durable rollback for an auto-synced app. Repository Secret examples contain placeholders, not credentials to commit. Narrow AppProject source/destination/resource permissions before production.

## Installation

```bash
# Create namespace
kubectl create namespace argocd

# Install ArgoCD
kubectl apply -n argocd -f https://raw.githubusercontent.com/argoproj/argo-cd/stable/manifests/install.yaml

# Get admin password
kubectl -n argocd get secret argocd-initial-admin-secret \
  -o jsonpath="{.data.password}" | base64 -d

# Port forward to access UI
kubectl port-forward svc/argocd-server -n argocd 8080:443

# Login with CLI
argocd login localhost:8080
```

## Application Definition

### Basic Application

```yaml
apiVersion: argoproj.io/v1alpha1
kind: Application
metadata:
  name: myapp
  namespace: argocd
spec:
  project: default
  source:
    repoURL: https://github.com/org/myapp-manifests.git
    targetRevision: main
    path: environments/production
  destination:
    server: https://kubernetes.default.svc
    namespace: myapp
  syncPolicy:
    automated:
      prune: true
      selfHeal: true
    syncOptions:
      - CreateNamespace=true
```

### Helm Application

```yaml
apiVersion: argoproj.io/v1alpha1
kind: Application
metadata:
  name: myapp-helm
  namespace: argocd
spec:
  project: default
  source:
    repoURL: https://github.com/org/myapp-chart.git
    targetRevision: main
    path: charts/myapp
    helm:
      valueFiles:
        - values.yaml
        - values-production.yaml
      parameters:
        - name: replicaCount
          value: "3"
        - name: image.tag
          value: "2.0.0"
  destination:
    server: https://kubernetes.default.svc
    namespace: myapp
  syncPolicy:
    automated:
      prune: true
      selfHeal: true
```

### Kustomize Application

```yaml
apiVersion: argoproj.io/v1alpha1
kind: Application
metadata:
  name: myapp-kustomize
  namespace: argocd
spec:
  project: default
  source:
    repoURL: https://github.com/org/myapp-manifests.git
    targetRevision: main
    path: overlays/production
    kustomize:
      images:
        - myapp=myregistry/myapp:2.0.0
  destination:

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