Define your multi-stage continuous deployment (CD) pipeline
Build and release pipelines are called definitions in TFS 2018 and in older versions. Service connections are called service endpoints in TFS 2018 and in older versions.
Azure Pipelines and Team Foundation Server (TFS) provide a highly configurable and manageable pipeline for releases to multiple stages such as development, staging, QA, and production stages; including requiring approvals at specific stages.
In this tutorial, you learn about:
- Configuring triggers within the release pipeline
- Extending a release pipeline by adding stages
- Configuring the stages as a multi-stage release pipeline
- Adding approvals to your release pipeline
- Creating a release and monitoring the deployment to each stage
A release pipeline that contains at least one stage. If you don't already have one, you can create it by working through any of the following quickstarts and tutorials:
Two separate targets where you will deploy the app. These could be virtual machines, web servers, on-premises physical deployment groups, or other types of deployment target. In this example, we are using Azure App Services website instances. If you decide to do the same, you will have to choose names that are unique, but it's a good idea to include "QA" in the name of one, and "Production" in the name of the other so that you can easily identify them. Use the Azure portal to create a new web app.
Configure the triggers in your release pipeline
In this section, you will check that the triggers you need for continuous deployment are configured in your release pipeline.
In Azure Pipelines, open the Releases tab. Select your release pipeline and, in the right pane, choose Edit.
Choose the Continuous deployment trigger icon in the Artifacts section to open the trigger panel. Make sure this is enabled so that a new release is created after every new successful build is completed.
For more information, see Release triggers.
Choose the Pre-deployment conditions icon in the Stages section to open the conditions panel. Make sure that the trigger for deployment to this stage is set to After release. This means that a deployment will be initiated automatically when a new release is created from this release pipeline.
Notice that you can also define artifact filters that determine a condition for the release to proceed, and set up a schedule for deployments. You can use features to, for example, specify a branch from which the build artifacts must have been created, or a specific time of day when you know the app will not be heavily used. For more information, see Stage triggers.
Extend a release pipeline by adding stages
In this section, you will add a new stage to the release pipeline. The two stages will deploy your app to the "QA" and the "Production" targets (in our example, two Azure App Services websites). This is a typical scenario where you deploy initially to a test or staging server, and then to a live or production server. Each stage represents one deployment target, though that target could be a physical or virtual server, a groups of servers, or any other legitimate physical or virtual deployment target.
In the Pipeline tab of your release pipeline, select the existing stage and rename it to Production.
Open the + Add drop-down list and choose Clone stage (the clone option is available only when an existing stage is selected).
Typically, you want to use the same deployment methods with a test and a production stage so that you can be sure the deployed apps will behave in exactly the same way. Therefore, cloning an existing stage is a good way to ensure you have the same settings for both. Then you just need to change the deployment targets (the websites where each copy of the app will be deployed).
The clone of the stage appears after the existing stage in the pipeline, and has the name Copy of Production. Select this stage and, in the Stages panel, change the name to QA.
To reorganize the stages in the pipeline, choose the Pre-deployment conditions icon for the QA stage and set the trigger to After release. The pipeline diagram changes to show that the deployment to the two stages will now execute in parallel.
Choose the Pre-deployment conditions icon for the Production stage and set the trigger to After stage, then select QA in the Stages drop-down list. The pipeline diagram changes to show that the deployment to the two stages will now execute in the required order.
Notice that you can specify deployment to start when a deployment to the previous stage is partially successful. Usually, this means the deployment tasks were set to continue the deployment even if a specific non-critical task failed (the default is that all tasks must succeed). You're most likely to set this option if you create a pipeline containing fork and join deployments that deploy to different stages in parallel.
Open the Tasks drop-down list and choose the QA stage. Recall that this stage is a clone of the original Production stage in the release pipeline. Therefore, currently, it will deploy the app to the same target as the Production stage.
Depending on the tasks that you are using, change the settings so that this stage deploys to your "QA" target. In our example, using Azure App Services websites, we just need to select the Deploy Azure App Service task and select the "QA" website instead of the "Production" website.
If you are using a different type of task to deploy your app, the way you change the target for the deployment may differ. For example, if you are using deployment groups, you may be able to select a different deployment group, or a different set of tags within the same deployment group.
NOTE: Some settings for the tasks may have been automatically defined as stage variables when you created a release pipeline from a template. These settings cannot be modified in the task settings; instead you must select the parent stage item in order to edit these settings.
Add approvals within a release pipeline
The release pipeline you have modified deploys to test and then to production. If the deployment to test fails, the trigger on the production stage does not fire, and so it is not deployed to production. However, it is typically the case that you want the deployment to pause after successful deployment to the test website so that you can verify the app is working correctly before you deploy to production. In this section, you will add an approval step to the release pipeline to achieve this.
Back in the Pipeline tab of the release pipeline, choose the Pre-deployment conditions icon in the Stages section to open the conditions panel. Scroll down to the Pre-deployment approvers section and enable pre-deployment approvers.
In the Approvers section, choose your user(s) from the list. You can type part of a name to search for matches. Also make sure you clear (untick) the checkbox User requesting a release... so that you can approve your own releases.
You can add as many approvers as you need, both individual users and organization groups. It's also possible to set up post-deployment approvals by choosing the icon at the right side of the stage item in the pipeline diagram. For more information, see Approvals and gates overview.
Save the modified release pipeline.
Create a release
Now that you have completed the modifications to the release pipeline, it's time to start the deployment. To do this, you create a release from the release pipeline. A release may be created automatically; for example, the continuous deployment trigger is set in the release pipeline. This means that modifying the source code will start a new build and, from that, a new release. However, in this section you will create a new release manually.
Open the Release drop-down list and choose Create release.
Enter a description for the release, check that the correct artifacts are selected, and then choose Create.
After a few moments, a banner appears indicating that the new release was created. Choose the link (the name of the release).
The release summary page opens showing details of the release. In the Stages section, you will see the deployment status for the "QA" stage change to "Succeeded" and, at that point, an icon appears indicating that the release is now waiting for approval.
Other views, such as the list of releases, also display an icon that indicates approval is pending. The icon shows a pop-up containing the stage name and more details when you point to it. This makes it easy for an administrator to see which releases are awaiting approval, as well as the overall progress of all releases.
Choose the icon or link to open the approval dialog. Enter a brief note about the approval, and choose Approve.
Notice that you can defer a deployment to a specific day and time; for example, a time when you expect the app to be only lightly loaded. You can also reassign the approval to another user. Release administrators can open any approval and over-ride it to accept or reject that deployment.
Monitor and track deployments
In this section, you will see how you can monitor and track deployments - in this example to two Azure App Services websites - from the release you created in the previous section.
In the release summary, hover over a stage and choose the Logs link that appears.
While the deployment is taking place, the logs page shows the live log from the agent. After the deployment is complete, links to the logs for each task step are displayed in the right pane.
Select any of the pipeline steps to show just the log file contents for that step. This makes it easier to trace and debug individual parts of the overall deployment. Alternatively, download the individual log files, or a zip of all the log files, from the icons and links in the page.
If you are having problems with a deployment, you can get more information from the log files by running the release in debug mode.