[New article]: Troubleshooting "name [resource name] is already in use"

[mitchdenny]

Proposed topic or title

Troubleshooting name already in use when deploying Aspire application sto Azure

Location in table of contents.

Troubleshooting

Reason for the article

When deploying an Aspire application to Azure, resources in the application are turned into Azure resources. Azure resources sometimes have a globally scoped name. A good example is Azure AppConfig where all AppConfig instances are in the [name].azconfig.io global namespace.

The value of [name] is derived from the Aspire resource name plus some random characters based on the name of the resource group that the resource is deployed in. Because the [uniqueString(...)] function that is used to generate these random characters produces a string that when combined with the resource name would exceed the allowable resource name length for AppConfig (in this example), some of the characters are truncated.

Unfortunately this creates an opportunity where the combination of [name]+[truncated hash] isn't sufficiently unique to avoid conflicts in the global namespace. When a conflict occurs the resource fails to deploy.

We need an article that explains this, and also proposes workarounds. One workaround is to avoid using common names like appconfig or storage for resources and instead pick a name which is more application specific.

Depending on the string the potential for conflict is reduced but not eliminated. In these cases knowing how to use the callback methods to set a specific name to avoid using the computed string altogether might be desirable.

Article abstract

When deploying to Azure initial deployments may fail if the resource name is already in use. This article describes several techniques to avoid this problem.

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Associated WorkItem - 261090