How to configure custom environment variables to the docker containers running behind Azure App Service Web App

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How to configure custom environment variables to the docker containers running behind Azure App Service Web App

Chandra Pal, Madhab 0

I am trying set some environment variables while running the docker container behind the Azure App Service. These are custom environment variables which will be picked up by Dynatrace oneagent component for RUM monitoring. I searched a lot but did not find any option to pass any custom environment variables other than the App Environment variables enabled for the Web App as explained here: https://learn.microsoft.com/en-us/azure/app-service/reference-app-settings?tabs=kudu%2Cdotnet#app-environment

Does anyone know any way to configure custom environment variable to the docker containers running behind the Azure Web App?

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Answer 1

Chandra Pal, Madhab 0

Hi Shree.

I have already tried that way, I had configured the DT environment variables in the Setting of the We App's Environment Variables and I could also see the environment variables effective from the Kudu shell. But I don't see those DT environment variables are picked up by Dynatrace and that's because I suppose those are not configured in the environment before the Dynatrace OneAgent is invoked during container start.

Shree Hima Bindu Maganti 7,035 Reputation points Microsoft External Staff Moderator

2024-11-29T13:27:25.3233333+00:00
Hi Chandra Pal, Madhab ,
Thnakyou for your Response.
You can ensure that the required environment variables are available before the Dynatrace OneAgent starts by adding them directly in the Dockerfile.
Ensure the variables are there into the container image before it starts.

FROM your-base-image # Set the required Dynatrace environment variables ENV DT_CUSTOM_VARIABLE=some_value ENV DT_ANOTHER_VARIABLE=another_value # Install and configure Dynatrace OneAgent COPY dynatrace-oneagent /opt/dynatrace-oneagent RUN /opt/dynatrace-oneagent/install.sh # Application start command CMD ["your-app-start-command"]

You need to sets the environment variables before starting the OneAgent:

startup.sh

#!/bin/bash # Export Dynatrace environment variables export DT_CUSTOM_VARIABLE=some_value export DT_ANOTHER_VARIABLE=another_value # Start Dynatrace OneAgent /opt/dynatrace-oneagent/start.sh # Start the application exec "$@"

Update the Dockerfile to use the script:

COPY startup.sh /usr/local/bin/startup.sh RUN chmod +x /usr/local/bin/startup.sh ENTRYPOINT ["/usr/local/bin/startup.sh"]

Access the container logs or use printenv to confirm variables are present before the OneAgent starts:

docker exec -it <container-id> printenv | grep DT_CUSTOM_VARIABLE

Run the container locally to ensure variables are picked up during startup

docker run -e DT_CUSTOM_VARIABLE=some_value your-image

Check the for specific guidance on when the OneAgent reads environment variables
https://docs.dynatrace.com/docs
Shree Hima Bindu Maganti 7,035 Reputation points Microsoft External Staff Moderator

2024-12-02T01:42:40.16+00:00

Hi Chandra Pal, Madhab ,

Following up to see if you have chance to check my previous response and help us with requested information to check and assist you further on this.
Shree Hima Bindu Maganti 7,035 Reputation points Microsoft External Staff Moderator

2024-12-03T05:08:26.9133333+00:00

Hi Chandra Pal, Madhab ,

Following up to see if you have chance to check my previous response and help us with requested information to check and assist you further on this.

Answer 2

Hi Chandra Pal, Madhab ,
Welcome to the Microsoft Q&A Platform!
To configure custom environment variables for Docker containers running behind Azure App Service,Since App Service doesn't allow direct modification of the container runtime environment outside the options provided by the App Settings interface.

Navigate to your Azure App Service in the Azure Portal.
Go to the Configuration section under Settings.
Click on Application Settings.
Add your custom environment variables by specifying their Key and Value. For example:
Key: DT_CUSTOM_VARIABLE
Value: some_value
Save the changes. These variables will be injected into the environment of your container.
Ensure that your Docker container is configured to read these environment variables.
In your Dockerfile or application code, access the variables using the appropriate method .
After saving the changes, restart your App Service to ensure the new environment variables are applied to the running container.
you can verify that the variables have been set correctly by Using the Kudu console.
Navigate to your Web App in the Azure Portal.
Go to Development Tools > Advanced Tools (Kudu) > Go.
Open the debug console and use commands like printenv or cat /proc/1/environ to inspect the container's environment variables.
Pass Environment Variables Directly in Docker Compose (if applicable).If you are deploying using a custom Docker Compose file, include the environment variables in the environment.

version: '3.8'
services:
  app:
    image: your-image
    environment:
      - DT_CUSTOM_VARIABLE=some_value

Ensure that your custom variables are aligned with Dynatrace's requirements.
https://learn.microsoft.com/en-us/azure/app-service/reference-app-settings?tabs=kudu%2Cdotnet#app-environment
https://docs.dynatrace.com/docs/manage/tags-and-metadata/setup/define-tags-based-on-environment-variables
Let me know if you have any further assistances.

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How to configure custom environment variables to the docker containers running behind Azure App Service Web App

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