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docs: add Azure load balancer migration
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3u13r committed Oct 7, 2024
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This document describes breaking changes and migrations between Constellation releases.
Use [`constellation config migrate`](./cli.md#constellation-config-migrate) to automatically update an old config file to a new format.

## Migrating from Azure's service principal authentication to managed identity authentication

## Migrations to v2.19.0

### Azure

* To allow seamless upgrades on Azure when Kubernetes services of type `LoadBalancer` are deployed, we changed the target

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load balancer in which the `cloud-controller-maanger` create the load balancing rules. Instead of using the load balancer we

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create and maintain in the CLI's Terraform code, the `cloud-controller-mananger` now creates its own load balancer in Azure.
If inside your Constellation there are services of type `LoadBalancer`, please remove them before the upgrade and re-apply them
afterwards.

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## Migrating from Azure's service principal authentication to managed identity authentication (during the upgrade to Constellation v2.8.0)

- The `provider.azure.appClientID` and `provider.azure.appClientSecret` fields are no longer supported and should be removed.
- To keep using an existing UAMI, add the `Owner` permission with the scope of your `resourceGroup`.
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