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09-Blue-Green-Deployments.md

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Blue-Green Deployments

  • What is a blue-green deployment? Why would you use it?

it's a technique that reduces downtime and risk by running two identical production environments called Blue and Green.

This technique can eliminate downtime due to application deployment. Blue-green deployment also reduces risk; if something unexpected happens with your new version on Green, you can immediately roll back to the last version by switching back to Blue.

  • How do you map and unmap route with cf?

cf map-route APP_NAME DOMAIN [--hostname HOSTNAME] [--path PATH]

cf unmap-route APP_NAME DOMAIN [--hostname HOSTNAME] [--path PATH]

  • How does route mapping enable a blue-green deployment?

by routing the existing domain to the Green

  • What other steps are involved in a blue-green deployment?

pluralsight recap

  • What is the purpose of a Blue-Green deployment?

To achieve no downtime when managing multiple versions of your application

  • How is the distribution of traffic handled when running multiple versions of an application?

It's based on the percentage of app instances that is running, and traffic will be distributed accordingly

  • True of False. When releasing a new version of an application, adding a new non-nullable field to a database table is an acceptable Blue-Green strategy?

False. If it's a new non-nullable field without a default value then the old version of the application will run into problems when your application deploys.

  • How would a rollback situation be handled using a Blue-Green deployment?

Unmap the production route from the next version of the application.

  • What other design implications does running at least two versions of the same time have on your application?

Changes need to be backwards compatible and non-destructive

pluralsight exercise questions

  • How would a rollback situation be handled using a blue-green deployment?

  • What other design implications does running at least two versions at the same time have on your applications? Do you do blue-green deployments today? How is this different?