By default, all your traffic is routed to the production slot. In the table of your slots, you will see a column for Traffic %. In the Azure Portal, go to the Deployment Slots menu. The remaining sections will explain how to canary your new deployments with App Service before releasing them to production. Traffic shadowing and mirroring are interesting topics, but they are outside the scope of this article. This is an umbrella term for activities such as traffic shadowing, mirroring, or canarying. Testing in Production is the general practice of utilizing production traffic to test a new deployment before fully releasing it. For more information on this distinction, see this article. There is an implicit distinction between deploying and releasing. Fully release the new build by swapping into the production slot.The configuration here should match the production slot. Swap into a staging slot where the build is tested against a fraction of the production traffic.The new build is thoroughly tested by a QA or acceptance team. Swap the build into a QA slot where the configuration more closely resembles the production slot.Continuously deploy the master branch into a “testing” slot for developers to easily validate changes without pulling the branch and run it locally.Here is an example use case for multiple slots: If you work in a large team, you can create slots for testing, quality assurance, canary testing, A/B testing, and more. When you’re ready, use the swap button (or CLI command) to swap the slots. You can use the staging site to validate your latest changes. The workflow builds and deploys the application to the staging slot of the site. Up to now, you have a GitHub repository that will trigger a GitHub Action workflow whenever there is a push to the main branch. You can also use slots with custom containers. When the operation completes, browse to the production site and you should see the sample application! The staging slot should now have the sample application, and the staging slot will have the placeholder HTML page with help text. Click swap at the bottom of the menu to swap the slots. A future article will cover app settings in more detail. App settings are key-value configurations that are exposed to your app as environment variables. The Swap button will open a context menu with a table to preview any changes configuration changes that will occur after the swap. You will see a production and staging slot. This will open a new blade showing a list of your site’s slots. On the left side menu, select Deployment slots. You will also learn how to route a percentage of your production traffic to the staging environment to test the next build before it is fully released. In this article, you will learn how to release your new build to your production traffic by swapping the production and staging slots. This article assumes you have already completed the previous two articles.Īt this point, you have a CI/CD pipeline built on GitHub Actions that deploys your code into a staging slot whenever a commit is pushed to the main branch. This is the third article in the Zero to Hero with App Service series.
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