AEM Version Updates aem-version-updates
Learn how Adobe Experience Manager (AEM) as a Cloud Service uses continuous integration and delivery (CI/CD) to keep your projects on the latest version.
CI/CD ci-cd
AEM as a Cloud Service uses continuous integration and continuous delivery (CI/CD) to ensure that your projects are on the most current AEM version. This process seamlessly updates your production, staging, and development instances without causing any disruption to your users.
Before your instances are automatically updated, a new AEM Maintenance release is published 3-5 days in advance. During this period, you can optionally trigger manual updates for your development instances. After this time elapses, version updates are automatically applied to your development environments first. If the update is successful, the update process proceeds to your stage and production instances. The development and staging instances act as an automated quality gate, where your custom-written tests are run before the update is applied on your production environment.
Type of Updates update-types
There are two types of AEM version updates:
-
- They are mostly for maintenance purposes, including the latest bug-fixes and security updates.
- It has minimal impact because changes are applied regularly.
-
- They are released on a predictable, monthly schedule.
Update Failure update-failure
AEM updates go through an intense and fully automated product validation pipeline involving multiple steps, ensuring no disruption of service for any systems in production. Health checks are used to monitor the health of the application. If these checks fail during an AEM as a Cloud Service update, the release does not proceed, and Adobe investigates why the update caused this unexpected behavior.
When you deploy a new version of custom code on your environment, Product and Custom functional tests play a crucial role. They ensure that the production systems remain stable and functional even after a change is applied. These tests are also applied in the AEM Version update process.
If the update to the production environment fails, Cloud Manager automatically rolls back the staging environment. This is done automatically to make sure that after an update completes, both the staging and production environments are on the same AEM version.
Similarly, if an automated update of a development environment fails, staging and production environments are not updated.
Best Practices best-practices
-
Stage Environment Usage
- Use a different environment (not Stage) for long QA/UAT cycles.
- After sanity testing is completed on Stage, move to verify on Production.
-
Production Pipeline
- Pause before deploying to Production.
- Canceling the pipeline after a Stage deploy indicates that the code is “a throwaway” and not a valid candidate for Production, refer Configuring a Production Pipeline.
-
Non-Production Pipeline
- Configure a Non-Production Pipeline.
- Accelerate delivery speed/frequency for production pipeline failures. Identify issues in non-prod pipelines by enabling Product Functional Testing, Custom Functional Testing, and Custom UI Testing.
-
Content Copy
- Use Content Copy to move similar content sets to a non-prod environment.
-
Automated Functional Testing
- Include automated testing in your pipeline so you can test critical functionality.
- Customer Functional Testing and Custom UI Testing are blocking, if they fail the AEM release does not get rolled out.
Regression regression
If you encounter an issue related to regression, submit a support case by way of the Admin Console. If the issue is a blocker and its impacting Production, a P1 should be raised. Provide all details required to reproduce the regression issue.
Composite Node Store composite-node-store
Usually, updates incur zero downtime, including for the authoring instance, which is a cluster of nodes. Rolling updates are possible due to the composite node store feature in Oak.
This feature allows AEM to reference multiple repositories simultaneously. In a rolling deployment, the new AEM version contains its own /libs (the TarMK based immutable repository). It is distinct from the older AEM version, although both reference a shared DocumentMK based mutable repository that contains areas like /content , /conf , /etc and others.
Because both the old and the new versions have their own versions of /libs, they can both be active during the rolling update. And, both can take on traffic until the old is fully replaced by the new.