GitOps

Content

Installing and managing OpenShift GitOps for declarative cluster and application management:

OpenShift GitOps Installation

  • Operator Installation: Install OpenShift GitOps Operator from OperatorHub or via CLI

  • Instance Configuration: Configure ArgoCD instances for different environments (dev, staging, prod)

  • Resource Sizing: Size ArgoCD components based on repository count and sync frequency requirements

  • High Availability: Configure ArgoCD for high availability in production environments

  • Namespace Management: Set up appropriate namespaces and RBAC for GitOps operations

ArgoCD Configuration Management

  • Repository Integration: Connect ArgoCD to Git repositories (GitHub, GitLab, Bitbucket, etc.)

  • Cluster Registration: Register additional OpenShift clusters as ArgoCD deployment targets

  • Application Projects: Configure ArgoCD projects to organize and isolate applications

  • RBAC Configuration: Set up role-based access control for different teams and environments

  • SSO Integration: Integrate ArgoCD with OpenShift OAuth or external identity providers

Application Lifecycle Management

  • Application Definitions: Create and manage ArgoCD Application custom resources

  • Sync Policies: Configure automatic vs manual sync policies and sync windows

  • Health Checks: Define custom health checks for application resources

  • Rollback Procedures: Implement rollback strategies for failed deployments

  • Multi-cluster Deployments: Manage applications across multiple OpenShift clusters

GitOps Workflow Implementation

  • Repository Structure: Establish standardized Git repository structures for infrastructure and applications

  • Branching Strategy: Implement GitOps-friendly branching strategies (GitFlow, trunk-based, etc.)

  • Promotion Workflows: Set up automated promotion workflows between environments

  • Secret Management: Integrate external secret management solutions (Vault, External Secrets Operator)

  • Configuration Management: Manage environment-specific configurations using Kustomize or Helm

Monitoring and Observability

  • ArgoCD Metrics: Monitor ArgoCD performance, sync status, and application health

  • Sync Monitoring: Track application sync frequency, duration, and success rates

  • Drift Detection: Monitor and alert on configuration drift between Git and cluster state

  • Audit Logging: Enable comprehensive audit logging for GitOps operations

  • Notification Setup: Configure notifications for sync failures, drift detection, and deployment events

Security and Compliance

  • Git Repository Security: Implement secure Git repository access using SSH keys or tokens

  • Image Security: Integrate image scanning and security policies into GitOps workflows

  • Policy Enforcement: Use Open Policy Agent (OPA) Gatekeeper for policy-as-code enforcement

  • Compliance Scanning: Integrate compliance tools into GitOps deployment pipelines

  • Access Controls: Implement least-privilege access for GitOps service accounts and users

Disaster Recovery and Backup

  • ArgoCD Backup: Implement backup strategies for ArgoCD configuration and application definitions

  • Repository Backup: Ensure Git repository backup and disaster recovery procedures

  • Cluster Recovery: Establish cluster recovery procedures using GitOps for rapid restoration

  • State Reconstruction: Implement procedures to reconstruct cluster state from Git repositories

  • Testing Recovery: Regularly test disaster recovery procedures in non-production environments

References

Knowledge Check