Blue Green Deployment

Deployment strategy for minimum or no downtime. This strategy becomes more feasible and relevant in Cloud environment as Infrastructure provisioning becomes automated.

Let us call existing prod env.  Blue.

1. Create a clone  of that, call it Green.

2. Switch the prod traffic to Green

3. Update blue with changes and test. 

4. when everything look ok , switch the traffic back to Blue.

5. Terminate Green