What Is Blue-Green Deployment? Zero-Downtime Deploys Explained
Blue-green deployment runs two identical environments and switches traffic instantly. Here's how to do it with OpenClaw on Fly.io.
Blue-green deployment keeps two identical production environments running simultaneously. The 'blue' environment serves live traffic while 'green' receives the new version. Once green is verified, traffic switches over instantly.
Fly.io Native Support
Fly.io's fly deploy command implements a form of blue-green deployment automatically. It launches new VMs alongside existing ones, waits for health checks to pass, then routes traffic to the new instances. Old instances stay running briefly for rollback if needed.
Why It Matters
Traditional deployments risk downtime during the switch. Blue-green eliminates that window. For chatbots and API backends that can't lose requests mid-deploy, this is critical.
Manual Blue-Green on Fly
You can manually orchestrate a blue-green strategy: deploy to a specific region with fly deploy --region <region>, verify, then use fly scale count to shift traffic. OpenClaw abstracts this but you can access Fly's raw machines API for custom orchestration.