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GitOps and Infrastructure as Code

GitOps and Infrastructure as Code (IaC) are complementary practices in modern software delivery that utilize declarative definitions to manage infrastructure and application deployments^[600-developer__DevOps_languages_history.md].

While IaC focuses on the methodology of managing and provisioning infrastructure through machine-readable definition files rather than physical hardware configuration or interactive configuration tools^[600-developer__DevOps_languages_history.md], GitOps is an operational framework that takes the principles of IaC and applies them to the entire software delivery lifecycle, using Git as the "single source of truth"^[600-developer__DevOps_languages_history.md].

Infrastructure as Code (IaC)

IaC treats infrastructure configuration (servers, networks, databases) as software code^[600-developer__DevOps_languages_history.md]. This approach allows teams to version control their infrastructure, ensuring that environment setups are repeatable and consistent^[600-developer__DevOps_languages_history.md].

  • Declarative vs. Imperative: IaC often uses a declarative style (specifying what the infrastructure should look like) rather than imperative (specifying how to create it). This allows the system to automatically converge to the desired state^[600-developer__DevOps_languages_history.md].
  • Idempotency: IaC configurations are designed to be idempotent, meaning they can be run multiple times with the same result without causing unintended side effects^[600-developer__DevOps_languages_history.md].

GitOps

GitOps extends IaC by using Git repositories as the single source of truth for the entire system—infrastructure, applications, and configuration^[600-developer__DevOps_languages_history.md].

Core Workflow

The typical GitOps workflow involves: 1. Declarative Configuration: Developers define the desired state of the system (infrastructure and apps) in code^[600-developer__DevOps_languages_history.md]. 2. Version Control: These definitions are committed to Git^[600-developer__DevOps_languages_history.md]. 3. Automated Sync: Automated agents (software agents running inside the cluster) detect the difference between the desired state in Git and the live state in the production environment^[600-developer__DevOps_languages_history.md]. 4. Reconciliation: The agents reconcile the differences, ensuring the live environment matches the Git repository^[600-developer__DevOps_languages_history.md].

Key Benefits

  • Improved Productivity: By automating deployment and infrastructure management, developer velocity increases^[600-developer__DevOps_languages_history.md].
  • Enhanced Developer Experience: Developers use familiar tools (Git) and standard workflows (Pull Requests) to manage infrastructure and deployments, without needing direct access to Kubernetes CLI or infrastructure consoles^[600-developer__DevOps_languages_history.md].
  • Increased Stability: The use of Git's version control provides a history of changes, rollbacks, and audit trails, increasing system stability and reliability^[600-developer__DevOps_languages_history.md].
  • Consistency and Reliability: Automated reconciliation ensures that the actual state of the infrastructure matches the desired state, reducing "configuration drift"^[600-developer__DevOps_languages_history.md].

Differences and Synergy

While IaC defines how infrastructure is created, GitOps defines how those definitions are deployed and maintained^[600-developer__DevOps_languages_history.md].

  • IaC is a necessary prerequisite for GitOps; you cannot have GitOps without defining your infrastructure as code^[600-developer__DevOps_languages_history.md].
  • GitOps provides the orchestration and enforcement layer for IaC, ensuring that the code defined in IaC tools is actually reflected in the running environment^[600-developer__DevOps_languages_history.md].

Sources

  • 600-developer__DevOps_languages_history.md