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)

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:
    server: https://kubernetes.default.svc
    namespace: myapp

Projects

yaml

apiVersion: argoproj.io/v1alpha1
kind: AppProject
metadata:
  name: myproject
  namespace: argocd
spec:
  description: My Project
  sourceRepos:
    - https://github.com/org/*
  destinations:
    - namespace: myapp-*
      server: https://kubernetes.default.svc
  clusterResourceWhitelist:
    - group: ''
      kind: Namespace
  namespaceResourceWhitelist:
    - group: '*'
      kind: '*'
  roles:
    - name: developer
      description: Developer role
      policies:
        - p, proj:myproject:developer, applications, get, myproject/*, allow
        - p, proj:myproject:developer, applications, sync, myproject/*, allow
      groups:
        - developers

Application Sets

Git Generator

yaml

apiVersion: argoproj.io/v1alpha1
kind: ApplicationSet
metadata:
  name: myapp-environments
  namespace: argocd
spec:
  generators:
    - git:
        repoURL: https://github.com/org/myapp-manifests.git
        revision: main
        directories:
          - path: environments/*
  template:
    metadata:
      name: 'myapp-{{path.basename}}'
    spec:
      project: default
      source:
        repoURL: https://github.com/org/myapp-manifests.git
        targetRevision: main
        path: '{{path}}'
      destination:
        server: https://kubernetes.default.svc
        namespace: 'myapp-{{path.basename}}'
      syncPolicy:
        automated:
          prune: true
          selfHeal: true

List Generator

yaml

apiVersion: argoproj.io/v1alpha1
kind: ApplicationSet
metadata:
  name: myapp-clusters
  namespace: argocd
spec:
  generators:
    - list:
        elements:
          - cluster: production
            url: https://prod-cluster.example.com
          - cluster: staging
            url: https://staging-cluster.example.com
  template:
    metadata:
      name: 'myapp-{{cluster}}'
    spec:
      project: default
      source:
        repoURL: https://github.com/org/myapp-manifests.git
        targetRevision: main
        path: 'environments/{{cluster}}'
      destination:
        server: '{{url}}'
        namespace: myapp

Matrix Generator

yaml

apiVersion: argoproj.io/v1alpha1
kind: ApplicationSet
metadata:
  name: myapp-matrix
  namespace: argocd
spec:
  generators:
    - matrix:
        generators:
          - git:
              repoURL: https://github.com/org/myapp-manifests.git
              revision: main
              directories:
                - path: apps/*
          - list:
              elements:
                - env: staging
                - env: production
  template:
    metadata:
      name: '{{path.basename}}-{{env}}'
    spec:
      project: default
      source:
        repoURL: https://github.com/org/myapp-manifests.git
        targetRevision: main
        path: '{{path}}/overlays/{{env}}'
      destination:
        server: https://kubernetes.default.svc
        namespace: '{{path.basename}}-{{env}}'

Sync Policies

Automated Sync

yaml

syncPolicy:
  automated:
    prune: true          # Delete resources not in Git
    selfHeal: true       # Revert manual changes
    allowEmpty: false    # Don't sync empty directories
  syncOptions:
    - CreateNamespace=true
    - PrunePropagationPolicy=foreground
    - PruneLast=true
  retry:
    limit: 5
    backoff:
      duration: 5s
      factor: 2
      maxDuration: 3m

Sync Waves

yaml

# In Kubernetes manifests
apiVersion: v1
kind: ConfigMap
metadata:
  name: myconfig
  annotations:
    argocd.argoproj.io/sync-wave: "-1"  # Sync first
---
apiVersion: apps/v1
kind: Deployment
metadata:
  name: myapp
  annotations:
    argocd.argoproj.io/sync-wave: "0"   # Sync second

Sync Hooks

yaml

apiVersion: batch/v1
kind: Job
metadata:
  name: migration
  annotations:
    argocd.argoproj.io/hook: PreSync
    argocd.argoproj.io/hook-delete-policy: HookSucceeded
spec:
  template:
    spec:
      containers:
        - name: migrate
          image: myapp:latest
          command: ["./migrate.sh"]
      restartPolicy: Never

CLI Commands

bash

# List applications
argocd app list

# Get application details
argocd app get myapp

# Sync application
argocd app sync myapp

# Force sync (ignore differences)
argocd app sync myapp --force

# View diff
argocd app diff myapp

# Rollback
argocd app rollback myapp

# Delete application
argocd app delete myapp

# View logs
argocd app logs myapp

# Hard refresh (clear cache)
argocd app get myapp --hard-refresh

Repository Configuration

yaml

apiVersion: v1
kind: Secret
metadata:
  name: private-repo
  namespace: argocd
  labels:
    argocd.argoproj.io/secret-type: repository
stringData:
  url: https://github.com/org/private-repo.git
  username: git
  password: ghp_xxxx
---
# SSH key
apiVersion: v1
kind: Secret
metadata:
  name: private-repo-ssh
  namespace: argocd
  labels:
    argocd.argoproj.io/secret-type: repository
stringData:
  url: git@github.com:org/private-repo.git
  sshPrivateKey: |
    -----BEGIN OPENSSH PRIVATE KEY-----
    ...
    -----END OPENSSH PRIVATE KEY-----

Notifications

yaml

apiVersion: v1
kind: ConfigMap
metadata:
  name: argocd-notifications-cm
  namespace: argocd
data:
  service.slack: |
    token: $slack-token
  template.app-deployed: |
    message: Application {{.app.metadata.name}} is now {{.app.status.sync.status}}.
  trigger.on-deployed: |
    - when: app.status.operationState.phase in ['Succeeded']
      send: [app-deployed]

Common Issues

Issue: Sync Fails with Diff

Problem: Resources show differences but are correct Solution: Configure ignore differences

yaml

spec:
  ignoreDifferences:
    - group: apps
      kind: Deployment
      jsonPointers:
        - /spec/replicas

Issue: Repository Not Accessible

Problem: ArgoCD cannot clone repository Solution: Check repository secret, verify URL and credentials

Issue: Application Stuck OutOfSync

Problem: Application never becomes synced Solution: Check resource status, review events, verify manifests

Issue: Health Check Failing

Problem: Application shows degraded health Solution: Check custom health checks, verify probe configurations

Best Practices

•Use ApplicationSets for multi-environment deployments
•Implement sync waves for ordered deployments
•Use projects to isolate applications
•Configure notifications for deployment events
•Implement proper RBAC with projects
•Use health checks for deployment verification
•Enable auto-pruning to remove deleted resources
•Keep manifests in dedicated repositories

Related Skills

•kubernetes-ops - K8s fundamentals
•helm-charts - Helm deployments
•kustomize - Kustomize overlays