Blue Green Deployment is type of continuous deployment that consist of two identical environments Blue and Green, both running on production version, but configured in way where one is Live and other is idle. It focuses mainly on redirecting the traffic between two environments running with a different version of the application.   This Deployment pattern reduces downtime and the risk which can occur due to the deployment.  In case any error occurs with the new version, we can immediately roll back to the stable version by swapping the environment.  To implement Blue-Green deployment, there should be two identical environments. Also, this requires Router or Load Balancer so that traffic can be routed to the desired environment  Here one of the either blue or green environment would indicate the old version of the application whereas the other environment would be the new version.  The production traffic would be moved gradually from the old version environment to the new version of the environment and once it is fully transferred, the old environment is kept on hold just in case of the rollback necessity.  We can implement Blue Green deployment in AWS by using Elastic Beanstalk service  and then swapping Application, which can help us in providing the  services for the automation of deployment process. Elastic Beanstalk helps in making the deployment process easy. Once we upload the application code with some version  on Elastic Beanstalk and provide information about the application, it deploys our application in the Blue Environment and provide us with the  URL.  The above Environment configuration is then copied and used to launch the new version of application-i.e. Green Environment with its own different and separate URL.  This point of time our application is Up with the two environments but the traffic is navigated to  only to one that is Blue Environment.   For Switching the environment to Green and re-directing the traffic to it, we need to choose other  Environment details from Elastic Beanstalk Console and Swap it using Action menu. It leads Elastic Beanstalk to perform the DNS Switch and once DNS changes are done, we can terminate the Blue Environment. In this way, traffic will be redirected to Green Environment.  In case of  Rollback required, we need to invoke the Switch Environment URL again.  Other than this ,there are a number of other solutions that AWS provides which we can use for implementing Blue Green deployment in our application , some of them are as follow:  DNS Routing with Route53  Swapping of Autoscaling Group with ELB  Blue-Green Deployment using AWS Code Deploy  Cloning Stack in OpsWork and Updating DNS.  Blue Green deployment provide many benefits to the DevOps team  and  proven to be  useful in deploying new application features or fixing  the software bug fix or issues .But it can be used only under below scenarios:  There should be identical and isolated environments.  There should be the provision for router or Load Balancer.  System should work with Continuous Update. The above factor can lead to increase in cost. Since project has to bear the  cost of two production environments and maintaining them. But costing factor can be controlled and managed well a  little bit , if planned in the proper way.  Reference: https://www.knowledgehut.com/blog/devops/blue-green-deployment