ArgoCD Real-World Implementation Scenarios

Multi-Cluster Management

Setting Up Multi-Cluster Architecture

apiVersion: argoproj.io/v1alpha1
kind: Application
metadata:
  name: multi-cluster-app
  namespace: argocd
spec:
  destination:
    server: https://kubernetes.default.svc
    namespace: production
  project: default
  source:
    path: kustomize/overlays/production
    repoURL: https://github.com/your-org/gitops
    targetRevision: HEAD
  syncPolicy:
    automated:
      prune: true
      selfHeal: true

Cross-Cluster Synchronization

  • Managing dependencies
  • Cluster registration
  • Resource propagation
  • Network configuration

Hybrid Cloud Deployments

Cloud Provider Integration

  1. AWS EKS Configuration
  2. Azure AKS Setup
  3. GCP GKE Implementation
  4. On-premises Integration

Network Considerations

  • Cross-cloud connectivity
  • Service mesh integration
  • Load balancing
  • Security groups

Microservices Orchestration

Application Definition

apiVersion: argoproj.io/v1alpha1
kind: ApplicationSet
metadata:
  name: microservices
  namespace: argocd
spec:
  generators:
  - list:
      elements:
      - service: auth
        namespace: auth-system
      - service: payment
        namespace: payment-system
  template:
    metadata:
      name: '{{service}}'
    spec:
      project: microservices
      source:
        repoURL: https://github.com/your-org/{{service}}
        targetRevision: HEAD
        path: kubernetes
      destination:
        server: https://kubernetes.default.svc
        namespace: '{{namespace}}'

Service Dependencies

  • Dependency graphs
  • Startup order
  • Health checks
  • Rollback strategies

Production Best Practices

High Availability Setup

  1. Multiple replicas
  2. Pod anti-affinity
  3. Network redundancy
  4. Backup strategies

Scaling Strategies

apiVersion: autoscaling/v2
kind: HorizontalPodAutoscaler
metadata:
  name: application-hpa
spec:
  scaleTargetRef:
    apiVersion: apps/v1
    kind: Deployment
    name: my-app
  minReplicas: 3
  maxReplicas: 10
  metrics:
  - type: Resource
    resource:
      name: cpu
      target:
        type: Utilization
        averageUtilization: 70

Compliance and Security

Audit Logging

apiVersion: v1
kind: ConfigMap
metadata:
  name: argocd-cm
  namespace: argocd
data:
  application.resourceTrackingMethod: annotation
  resource.customizations: |
    argoproj.io/Application:
      health.lua: |
        hs = {}
        hs.status = "Progressing"
        hs.message = ""
        return hs

Security Measures

  1. Network policies
  2. Pod security policies
  3. Secret management
  4. Access controls

Disaster Recovery

Backup Configuration

# Backup ArgoCD state
argocd admin export > argocd-backup.yaml

# Backup application configurations
kubectl get applications -n argocd -o yaml > applications-backup.yaml

# Backup secrets
kubectl get secrets -n argocd -o yaml > secrets-backup.yaml

Recovery Procedures

  1. Infrastructure recovery
  2. Data restoration
  3. Application reconciliation
  4. Validation checks

Performance Optimization

Resource Management

  • CPU/Memory tuning
  • Storage optimization
  • Network throughput
  • Cache configuration

Monitoring Setup

apiVersion: monitoring.coreos.com/v1
kind: ServiceMonitor
metadata:
  name: argocd-metrics
spec:
  selector:
    matchLabels:
      app.kubernetes.io/name: argocd-metrics
  endpoints:
  - port: metrics

Case Studies

E-Commerce Platform

  • Microservices architecture
  • Blue-green deployments
  • Canary releases
  • A/B testing

Financial Services

  • Compliance requirements
  • Security measures
  • Audit trails
  • Zero-downtime updates

SaaS Application

  • Multi-tenant setup
  • Resource isolation
  • Scalability patterns
  • Monitoring solutions

Troubleshooting Guide

Common Issues

  1. Sync failures
  2. Resource conflicts
  3. Network problems
  4. Authentication issues

Debug Procedures

# Check application status
argocd app get <app-name>

# View detailed sync status
argocd app sync <app-name> --debug

# Check controller logs
kubectl logs -n argocd -l app.kubernetes.io/name=argocd-application-controller

Multi-Cluster Management Extended Guide

Cluster Addition Workflow

# Add new cluster to ArgoCD
argocd cluster add <context-name>

# Verify cluster connection
argocd cluster list

# Test cluster access
argocd app list --dest-server <cluster-url>

Multi-Cluster Sync Strategies

Sequential Deployment

apiVersion: argoproj.io/v1alpha1
kind: Application
metadata:
  name: multi-cluster-app
  namespace: argocd
  annotations:
    argocd.argoproj.io/sync-wave: "1"  # Control sync order
spec:
  project: default
  source:
    repoURL: https://github.com/your-org/gitops
    path: kustomize/base
    targetRevision: HEAD
  destination:
    server: https://kubernetes.default.svc
    namespace: production

Parallel Deployment

apiVersion: argoproj.io/v1alpha1
kind: ApplicationSet
metadata:
  name: parallel-deploy
  namespace: argocd
spec:
  generators:
  - clusters: {}  # Deploy to all connected clusters
  template:
    metadata:
      name: '{{name}}-app'
    spec:
      project: default
      source:
        repoURL: https://github.com/your-org/gitops
        path: kustomize/base
      destination:
        server: '{{server}}'
        namespace: production

Cluster-Specific Configurations

Environment Overrides

apiVersion: argoproj.io/v1alpha1
kind: Application
metadata:
  name: cluster-specific-app
spec:
  source:
    repoURL: https://github.com/your-org/gitops
    path: kustomize/base
    kustomize:
      namePrefix: dev-
      commonLabels:
        environment: development

Homelab-Specific Considerations

Resource Optimization

Limited Resources Setup

apiVersion: v1
kind: ResourceQuota
metadata:
  name: argocd-quota
  namespace: argocd
spec:
  hard:
    requests.cpu: "2"
    requests.memory: 2Gi
    limits.cpu: "4"
    limits.memory: 4Gi

Network Optimization

apiVersion: networking.k8s.io/v1
kind: NetworkPolicy
metadata:
  name: argocd-network-policy
  namespace: argocd
spec:
  podSelector:
    matchLabels:
      app.kubernetes.io/part-of: argocd
  ingress:
  - from:
    - namespaceSelector:
        matchLabels:
          name: monitoring

Local Storage Configuration

Local Path Provisioner

apiVersion: storage.k8s.io/v1
kind: StorageClass
metadata:
  name: local-path
provisioner: rancher.io/local-path
volumeBindingMode: WaitForFirstConsumer

Advanced Use Cases

Blue-Green Deployments

apiVersion: argoproj.io/v1alpha1
kind: Application
metadata:
  name: blue-green-app
spec:
  source:
    plugin:
      name: blue-green
    repoURL: https://github.com/your-org/gitops
  syncPolicy:
    automated:
      prune: true
      selfHeal: true

Canary Deployments

apiVersion: argoproj.io/v1alpha1
kind: Application
metadata:
  name: canary-app
  annotations:
    argocd-image-updater.argoproj.io/image-list: app=your-org/app:latest
spec:
  source:
    repoURL: https://github.com/your-org/gitops
    path: kustomize/overlays/canary

Integration Examples

Monitoring Stack

apiVersion: argoproj.io/v1alpha1
kind: Application
metadata:
  name: monitoring-stack
spec:
  source:
    repoURL: https://github.com/prometheus-community/helm-charts
    targetRevision: HEAD
    helm:
      values: |
        grafana:
          enabled: true
        prometheus:
          enabled: true

CI/CD Pipeline Integration

apiVersion: argoproj.io/v1alpha1
kind: Application
metadata:
  name: jenkins-integration
spec:
  source:
    repoURL: https://github.com/your-org/jenkins-config
    path: kubernetes
    directory:
      recurse: true

Troubleshooting Advanced Scenarios

Multi-Cluster Issues

# Check cluster connectivity
argocd cluster get <cluster-url>

# Verify cluster resources
kubectl --context=<cluster-context> get nodes

# Test application deployment
argocd app sync <app-name> --dest-server <cluster-url>

Sync Issues

# Debug sync problems
argocd app sync <app-name> --debug

# Check resource health
argocd app get <app-name> --refresh

# View detailed sync status
argocd app history <app-name>

Performance Problems

# Monitor sync performance
argocd app list --output wide

# Check resource utilization
kubectl top pods -n argocd

# View detailed metrics
argocd admin metrics

Best Practices

Security Measures

  1. Implement network policies
  2. Use RBAC effectively
  3. Rotate credentials regularly
  4. Enable audit logging

High Availability

  1. Multiple replicas
  2. Pod anti-affinity
  3. Resource limits
  4. Backup strategies

Monitoring

  1. Prometheus integration
  2. Grafana dashboards
  3. Alert configuration
  4. Log aggregation

Next Steps

Return to the main guide or explore Integration Patterns.