Скачать или смотреть How to Fix Keycloak Migration Issues from v16 to v21 with PostgreSQL

Encountering problems during keycloak upgrade from v16 to v21? Discover how to successfully connect to your PostgreSQL database and migrate realms and users effortlessly.
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This video is based on the question https://stackoverflow.com/q/76528871/ asked by the user 'Marko Zadravec' ( https://stackoverflow.com/u/2791346/ ) and on the answer https://stackoverflow.com/a/76602955/ provided by the user 'Marko Zadravec' ( https://stackoverflow.com/u/2791346/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

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Solving Keycloak Migration Issues from v16 to v21

Upgrading Keycloak can be a tricky process, especially if you're switching from an older version such as v16 to the latest v21. Many users have encountered various issues, particularly when it comes to the import of realms and users. This post will guide you through a common problem faced during this migration — the inability of Keycloak to recognize existing realms and users from the PostgreSQL database — and how to resolve it effectively.

The Problem

When you upgrade from Keycloak v16 to v21, the expectation is that your existing realms and users will be seamlessly integrated into the new version. However, several users have reported that after the upgrade, Keycloak shows that realms and users are empty, despite the fact that they are still present in the PostgreSQL database. This typically indicates a connection issue with the database or incorrect configuration settings in the new Docker image.

Understanding the Issue

Key Indicators

Realms and users seem to be missing in the Keycloak admin console after upgrading.

However, the database still contains the realms and users as observed through direct database inspection.

An error message indicating a connection failure might appear, suggesting that Keycloak is unable to connect to the PostgreSQL database.

What Changed in Version 21

With the migration to version 21, new environment parameters were introduced that dictate how Keycloak connects with PostgreSQL. Failing to update these parameters often leads to silent connection errors.

Steps to Resolve the Migration Issue

Follow these organized steps to ensure a smooth upgrade and proper connection to your PostgreSQL database:

Step 1: Update the Docker Container Setup

Modify your docker-compose.yml file to include the new environment variables needed for Keycloak v21. Here’s how you can edit it:

[[See Video to Reveal this Text or Code Snippet]]

Step 2: Ensure Database Connection

Check Network Configurations: Make sure that the PostgreSQL container is correctly configured and that Keycloak can resolve the hostname db.

Postgres Accessibility: Confirm that PostgreSQL is accepting connections on port 5432 and that there are no firewall rules blocking access.

Step 3: Validate Migration Strategy

If realms and users still do not populate after a successful connection, check your migration strategy settings in your standalone-ha.xml configuration. Ensure you have correctly set the migrationStrategy to update. This tells Keycloak to utilize the existing data structures in the database.

Step 4: Inspect Logs for Errors

Monitor Keycloak's logs for any warning messages that may indicate failures in database connectivity. This can provide insight into what may still be wrong with the configuration.

Conclusion

Migrating from Keycloak v16 to v21 can be complex, especially concerning database management and user data migration. By carefully updating your Docker setup and ensuring your Keycloak instance can correctly connect to your PostgreSQL database, these issues can generally be resolved without significant loss of data or configuration.

Ensure to always back up your existing data before performing major upgrades and keep abreast of changes in environment parameters that may impact your setup.

With this guide, you should be able to streamline your migration process effectively. Happy Keycloaking!