Merge pull request #153532 from msangapu-msft/patch-29

Update faq-app-service-linux.md

Author: PRMerger20

articles/app-service/faq-app-service-linux.md

@@ -139,6 +139,20 @@ We have automatic port detection. You can also specify an app setting called *WE
 
 No, the platform handles HTTPS termination at the shared front ends.
 
+**Do I need to use PORT variable in code for built-in containers?**
+
+No, PORT variable is not necessary due to automatic port detection. If no port is detected, it defaults to 80.
+To manually configure a custom port, use the EXPOSE instruction in the Dockerfile and the app setting, WEBSITES_PORT, with a port value to bind on the container.
+
+**Do I need to use WEBSITES_PORT for custom containers?**
+
+Yes, this is required for custom containers. To manually configure a custom port, use the EXPOSE instruction in the Dockerfile and the app setting, WEBSITES_PORT, with a port value to bind on the container.
+
+**Can I use ASPNETCORE_URLS in the Docker image?**
+
+Yes, overwrite the environmental variable before .NET core app starts.
+E.g. In the init.sh script: export ASPNETCORE_URLS={Your value}
+
 ## Multi-container with Docker Compose
 
 **How do I configure Azure Container Registry (ACR) to use with multi-container?**
@@ -201,3 +215,4 @@ You can submit your idea at the [Web Apps feedback forum](https://aka.ms/webapps
 - [What is Azure App Service on Linux?](overview.md#app-service-on-linux)
 - [Set up staging environments in Azure App Service](deploy-staging-slots.md)
 - [Continuous Deployment with Web App for Containers](./deploy-ci-cd-custom-container.md)
+- [Things You Should Know: Web Apps and Linux](https://techcommunity.microsoft.com/t5/apps-on-azure/things-you-should-know-web-apps-and-linux/ba-p/392472)