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What's the difference between a blue/green deployment and a rolling deployment? I always thought that a blue/green deployment was a sudden switch of traffic from the old version to the new version immediately.
This talk about Blue/Green deployment on AWS shows various different strategies to implement a blue/green deployment, but they also seem to match the definition of a rolling deployment.
Is a blue/green deployment a subset of rolling deployments?
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A rolling deployment is generally faster than a blue/green deployment; however, unlike a blue/green deployment, in a rolling deployment there is no environment isolation between the old and new application versions.
A rolling deployment is a software release strategy that staggers deployment across multiple phases, which usually include one or more servers performing one or more function within a server cluster.
The canary deployment pattern is similar to a rolling deployment in that the IT team makes the new release available to some users before others. However, the canary technique targets certain users to receive access to the new application version, rather than certain servers.
I have written an essay on this topic here: http://blog.itaysk.com/2017/11/20/deployment-strategies-defined
In my opinion the difference is whether the new version is applied by replacing instances in the existing setup (in the case of rolling upgrade), or a completely isolated setup is created for the new version (in the case of Blue/Green). In my opinion Blue/Green is the safest strategy and is better in most cases for production deployments. Read the post for a detailed comparison.
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In Blue Green Deployment, you have TWO complete environments.
One is Blue environment which is running and the Green environment to which you want to upgrade. Once you swap the environment from blue to green, the traffic is directed to your new green environment. You can delete or save your old blue environment for backup until the green environment is stable.
In Rolling Deployment, you have only ONE complete environment.
Once you start upgrading your environment. The code is deployed in the subset of instances of the same environment and moves to another subset after completion.
So both are different in various factors and you need to choose the deployment model based on the scenario. Blue/green deployment is not a subset of rolling deployments.
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