GitOps: Managing Infrastructure and Applications with Git

What is GitOps?

GitOps is a set of practices and a branch of DevOps that manages infrastructure and application code deployments through Git commits. This means that most of the infrastructure and application configuration is stored in a git repository where we can manage and organize our DevOps and platform engineering team through PR and MR, commit messages, feature branches and release branches. When we talk about GitOps it is usually associated with tools such as ArgoCD and FluxCD but it can be extended to Infrastructure as Code (IaC) and Configuration as Code (CaC) with pipelines for deployment.

GitOps Workflow

In GitOps, Git is the source of truth for infrastructure and for application configuration. The desired state of the system is defined and stored in a state file as code in a Git repository. This ensures the traceability of the whole project that we are working on.

Continuous Deployment in GitOps automates the deployment process based on changes committed to the repo. When code changes are merged and pushed to the main branch the CI/CD pipelines automatically trigger deployments that produce consistent and reproducible process.

# GitOps CI/CD Pipeline Example with ArgoCD
name: Sync-apps
on:
  push:
    branches:
 - main
jobs:
  deploy:
    runs-on: ubuntu-latest
    steps:
 - name: Checkout git repo
   uses: actions/checkout@v2
 - name: Deploy using GitOps tool
   run: |
     argocd app symc my-app

GitOps pipeline stages

GitOps pipeline stages represent the steps involved in the deployment and management of infrastructure and applications.

Code changes and commits:

• Developers make changes to th e Git repository, such as updating configuration files or code.
• Changes are committed, providing an auditable history.

GitOps automation:

• CI/CD pipelines automatically detect changes in the Git repository.
• Automation scripts and tools (e.g., ArgoCD, FluxCD) apply changes to the target environment.

Infrastructure updates:

• Infrastructure updates include creating, modifying, or deleting resources based on the IaC code.
• Infrastructure changes are applied in a declarative manner to ensure the desired state.

Continuous monitoring:

• After deployment, GitOps systems continuously monitor the environment.
• Monitoring tools provide insights into the health and performance of applications and infrastructure.

This GitOps workflow ensures that infrastructure and applications are always aligned with the defined code in the Git repository, promoting consistency and reliability in DevOps practices.

Comparison of GitOps tools

Different GitOps tools offer varying features and capabilities. The choice of tool depends on specific requirements and preferences. Here’s a high-level comparison:

ArgoCD:

• Specialized for Kubernetes.
• Provides a web-based UI for managing applications.
• Supports multiple repositories and synchronization options.

FluxCD:

• Designed for Kubernetes.
• Offers a GitOps Toolkit for extensibility.
• Integrates with Helm charts for package management.

Challenges and Considerations

A. Security concerns in GitOps

While GitOps offers numerous benefits, it also introduces security considerations. Ensuring the security of your Git repository, infrastructure, and application code is paramount:

Security Considerations in GitOps

• Restrict access to the Git repository to authorized personnel.
• Implement two-factor authentication (2FA) for Git repository access.
• Regularly review and audit access logs to detect unauthorized changes.
• Encrypt sensitive data in your Git repository (e.g., credentials, API keys).

B. Managing secrets and sensitive data

Managing secrets and sensitive data securely is crucial in GitOps to prevent exposure of confidential information. One common approach is to use tools like Vault or environment-specific secret management:

Managing Secrets in GitOps

• Use secret management tools (HashiCorp Vault) to store sensitive data.
• Reference secrets in your GitOps configurations without exposing them.
• Implement environment-specific configurations for secrets to minimize exposure.
• Leverage Kubernetes secrets or other platform-specific secret stores.

Addressing these challenges and considerations is critical to maintaining the security and privacy of your infrastructure and applications when using GitOps.

Conclusion

GitOps represents a transformative approach to infrastructure and application management, harnessing the power of Git version control to streamline DevOps workflows. Its benefits include improved collaboration,version control, traceability, and reliability. It empowers teams to automate deployments, monitor changes, and ensure that infrastructure and applications align with the defined code in Git repositories. As we navigate the dynamic landscape of DevOps, adopting GitOps for infrastructure management is strongly encouraged. Its principles provide a strong foundation for managing complex environments, promoting consistency, and enabling rapid innovation. Looking ahead, GitOps is poised to play an increasingly pivotal role in the DevOps landscape as it evolves to address multi-cloud, edge computing, and AI/ML integration, ensuring that organizations can meet the challenges of modern software delivery and infrastructure management.

This article was originally published on keitaro.com