How do you document decisions and architecture for Blue/Green deployments?

Documenting decisions and architecture for Blue/Green deployments is crucial for maintaining clarity and consistency in deployment strategies. Clear documentation helps teams understand the deployment process and ensures that everyone is on the same page regarding the added benefits of Blue/Green deployments, such as reduced downtime and improved rollback capabilities.

Key Components of Documentation

• Deployment Strategy: Outline the rationale for adopting Blue/Green deployments and how it fits within the overall architecture.
• Architecture Diagram: Provide a visual representation of the architecture, highlighting the Blue and Green environments.
• Process Steps: Enumerate the steps involved in the deployment process, including preparations, execution, and rollback plans.
• Monitoring and Metrics: Explain how monitoring is conducted during and after deployments to ensure stability.

Example Documentation Structure

    // Blue/Green Deployment Documentation Structure:
    // 1. Overview
    // 2. Deployment Strategy
    // 3. Architecture Diagram (Link to Diagrams)
    // 4. Step-by-Step Process
    //      a. Prepare Blue Environment
    //      b. Deploy to Blue
    //      c. Switch Traffic
    //      d. Verify before Decommissioning Green
    // 5. Rollback Procedure
    // 6. Monitoring Setup and Alerts