Blue Green Deployment

Blue-Green Deployment is a deployment strategy that minimizes downtime and risk during software releases by using two identical production environments, referred to as Blue and Green.

How does it work?

1. Active Environment: One environment, e.g., Blue, is live and handles all user traffic.
2. Preparing the New Version: The new version of the application is deployed and tested in the inactive environment, e.g., Green, while the old version continues to run in the Blue environment.
3. Switching Traffic: Once the new version in the Green environment is confirmed to be stable, traffic is switched from the Blue environment to the Green environment.
4. Rollback Capability: If issues arise with the new version, traffic can be quickly switched back to the previous Blue environment.

Advantages:

• No Downtime: Users experience no disruption as the switch between environments is seamless.
• Easy Rollback: In case of problems with the new version, it's easy to revert to the previous environment.
• Full Testing: The new version is tested in a production-like environment without affecting live traffic.

Disadvantages:

• Cost: Maintaining two environments can be resource-intensive and expensive.
• Data Synchronization: Ensuring data consistency, especially if the database changes during the switch, can be challenging.

Blue-Green Deployment is an effective way to ensure continuous availability and reduce the risk of disruptions during software deployment.