Get the current slot the azure app service is running on?

Asked Nov 04 '18 at 03:40

Active Nov 04 '18 at 03:40

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We have an azure app service, with a production slot and staging slot. We often deploy to staging, do some testing and swap to proc. We do NOT use slot specific settings because they cause the app to restart upon swapping and we want swapping to be instant and transparent to users.

Question: How can I determine programmatically what slot the app is currently running on, as of right now?

We are aware of the WEBSITE_HOSTNAME environment variable, however it is useless since its value doesn't change upon swapping (as verified in Kudu). Also, I believe that a process must restart in order to refresh the value of an environment variable that was changed after the process started.

asked Nov 04 '18 at 03:40

Clement

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Did you try [this](https://stackoverflow.com/questions/4328462/staging-or-production-instance/35775500#35775500)? – Jayendran Nov 04 '18 at 09:20
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I said no slot specific settings. – Clement Nov 04 '18 at 20:04
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Possible duplicate of [Getting the azure app service slot name on startup?](https://stackoverflow.com/questions/50147803/getting-the-azure-app-service-slot-name-on-startup) – Tom Sun - MSFT Nov 05 '18 at 07:23
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Not a startup. At anytime. – Clement Nov 05 '18 at 11:07
@Clement Is it useful with `HttpContext.Current.Request.ServerVariables["HTTP_HOST"]`? – Jerry Liu Nov 06 '18 at 06:50
This requires an http context. Also, does it change when swapping? – Clement Nov 06 '18 at 10:10
@Clement In my test, yes it changes as expected. – Jerry Liu Nov 07 '18 at 01:33
Thanks, that seems promising, although I'd prefer a solution that doesn't depend on http context. – Clement Nov 07 '18 at 05:04
Does this answer your question? [Staging or Production Instance?](https://stackoverflow.com/questions/4328462/staging-or-production-instance) – yoel halb May 11 '22 at 20:39

Get the current slot the azure app service is running on?

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