Azure Container Apps

Overview

Azure Container Apps is a fully managed serverless platform for deploying and scaling container-based applications. Datadog provides monitoring and log collection for Container Apps through the Azure integration. Datadog also provides a solution, now in beta, for instrumenting your Container Apps applications with a purpose-built Agent to enable tracing, custom metrics, and direct log collection.

Prerequisites

Make sure you have a Datadog API Key and are using a programming language supported by a Datadog tracing library.

Instrument your application

You can instrument your application in one of two ways: Dockerfile or buildpack.

Dockerfile

Datadog publishes new releases of the serverless-init container image to Google’s gcr.io, AWS’ ECR, and on Docker Hub:

dockerhub.iogcr.iopublic.ecr.aws
datadog/serverless-initgcr.io/datadoghq/serverless-initpublic.ecr.aws/datadog/serverless-init

Images are tagged based on semantic versioning, with each new version receiving three relevant tags:

  • 1, 1-alpine: use these to track the latest minor releases, without breaking chagnes
  • 1.x.x, 1.x.x-alpine: use these to pin to a precise version of the library
  • latest, latest-alpine: use these to follow the latest version release, which may include breaking changes

How serverless-init works

The serverless-init application wraps your process and executes it as a subprocess. It starts a DogStatsD listener for metrics and a Trace Agent listener for traces. It collects logs by wrapping the stdout/stderr streams of your application. After bootstrapping, serverless-init then launches your command as a subprocess.

To get full instrumentation, ensure you are calling datadog-init as the first command that runs inside your Docker container. You can do this through by setting it as the entrypoint, or by setting it as the first argument in CMD.

Add the following instructions and arguments to your Dockerfile.

COPY --from=datadog/serverless-init:1 /datadog-init /app/datadog-init
COPY --from=datadog/dd-lib-js-init /operator-build/node_modules /dd_tracer/node/
ENV DD_SERVICE=datadog-demo-run-nodejs
ENV DD_ENV=datadog-demo
ENV DD_VERSION=1
ENTRYPOINT ["/app/datadog-init"]
CMD ["/nodejs/bin/node", "/path/to/your/app.js"]

Explanation

  1. Copy the Datadog serverless-init into your Docker image.

    COPY --from=datadog/serverless-init:1 /datadog-init /app/datadog-init

  2. Copy the Datadog Node.JS tracer into your Docker image.

    COPY --from=datadog/dd-lib-js-init /operator-build/node_modules /dd_tracer/node/

    If you install the Datadog tracer library directly in your application, as outlined in the manual tracer instrumentation instructions, omit this step.

  3. (Optional) Add Datadog tags.

    ENV DD_SERVICE=datadog-demo-run-nodejs
ENV DD_ENV=datadog-demo
ENV DD_VERSION=1

  4. Change the entrypoint to wrap your application in the Datadog serverless-init process. Note: If you already have an entrypoint defined inside your Dockerfile, see the alternative configuration.

    ENTRYPOINT ["/app/datadog-init"]

  5. Execute your binary application wrapped in the entrypoint. Adapt this line to your needs.

    CMD ["/nodejs/bin/node", "/path/to/your/app.js"]

Alternative configuration

If you already have an entrypoint defined inside your Dockerfile, you can instead modify the CMD argument.

COPY --from=datadog/serverless-init:1 /datadog-init /app/datadog-init
COPY --from=datadog/dd-lib-js-init /operator-build/node_modules /dd_tracer/node/
ENV DD_SERVICE=datadog-demo-run-nodejs
ENV DD_ENV=datadog-demo
ENV DD_VERSION=1
CMD ["/app/datadog-init", "/nodejs/bin/node", "/path/to/your/app.js"]

If you require your entrypoint to be instrumented as well, you can swap your entrypoint and CMD arguments instead. For more information, see How serverless-init works.

COPY --from=datadog/serverless-init:1 /datadog-init /app/datadog-init
COPY --from=datadog/dd-lib-js-init /operator-build/node_modules /dd_tracer/node/
ENV DD_SERVICE=datadog-demo-run-nodejs
ENV DD_ENV=datadog-demo
ENV DD_VERSION=1
ENTRYPOINT ["/app/datadog-init"]
CMD ["/your_entrypoint.sh", "/nodejs/bin/node", "/path/to/your/app.js"]

As long as your command to run is passed as an argument to datadog-init, you will receive full instrumentation.

Add the following instructions and arguments to your Dockerfile.

COPY --from=datadog/serverless-init:1 /datadog-init /app/datadog-init
RUN pip install --target /dd_tracer/python/ ddtrace
ENV DD_SERVICE=datadog-demo-run-python
ENV DD_ENV=datadog-demo
ENV DD_VERSION=1
ENTRYPOINT ["/app/datadog-init"]
CMD ["/dd_tracer/python/bin/ddtrace-run", "python", "app.py"]

Explanation

  1. Copy the Datadog serverless-init into your Docker image.

    COPY --from=datadog/serverless-init:1 /datadog-init /app/datadog-init

  2. Install the Datadog Python tracer.

    RUN pip install --target /dd_tracer/python/ ddtrace

    If you install the Datadog tracer library directly in your application, as outlined in the manual tracer instrumentation instructions, omit this step.

  3. (Optional) Add Datadog tags.

    ENV DD_SERVICE=datadog-demo-run-python
ENV DD_ENV=datadog-demo
ENV DD_VERSION=1

  4. Change the entrypoint to wrap your application in the Datadog serverless-init process. Note: If you already have an entrypoint defined inside your Dockerfile, see the alternative configuration.

    ENTRYPOINT ["/app/datadog-init"]

  5. Execute your binary application wrapped in the entrypoint, launched by the Datadog trace library. Adapt this line to your needs.

    CMD ["/dd_tracer/python/bin/ddtrace-run", "python", "app.py"]

Alternative configuration

If you already have an entrypoint defined inside your Dockerfile, you can instead modify the CMD argument.

COPY --from=datadog/serverless-init:1 /datadog-init /app/datadog-init
RUN pip install --target /dd_tracer/python/ ddtrace
ENV DD_SERVICE=datadog-demo-run-python
ENV DD_ENV=datadog-demo
ENV DD_VERSION=1
CMD ["/app/datadog-init", "/dd_tracer/python/bin/ddtrace-run", "python", "app.py"]

If you require your entrypoint to be instrumented as well, you can swap your entrypoint and CMD arguments instead. For more information, see How serverless-init works.

COPY --from=datadog/serverless-init:1 /datadog-init /app/datadog-init
RUN pip install --target /dd_tracer/python/ ddtrace
ENV DD_SERVICE=datadog-demo-run-python
ENV DD_ENV=datadog-demo
ENV DD_VERSION=1
ENTRYPOINT ["/app/datadog-init"]
CMD ["your_entrypoint.sh", "/dd_tracer/python/bin/ddtrace-run", "python", "app.py"]

As long as your command to run is passed as an argument to datadog-init, you will receive full instrumentation.

Add the following instructions and arguments to your Dockerfile.

COPY --from=datadog/serverless-init:1 /datadog-init /app/datadog-init
ADD 'https://dtdg.co/latest-java-tracer' /dd_tracer/java/dd-java-agent.jar
ENV DD_SERVICE=datadog-demo-run-java
ENV DD_ENV=datadog-demo
ENV DD_VERSION=1
ENTRYPOINT ["/app/datadog-init"]
CMD ["./mvnw", "spring-boot:run"]

Explanation

  1. Copy the Datadog serverless-init into your Docker image.

    COPY --from=datadog/serverless-init:1 /datadog-init /app/datadog-init

  2. Add the Datadog Java tracer to your Docker image.

    ADD 'https://dtdg.co/latest-java-tracer' /dd_tracer/java/dd-java-agent.jar

    If you install the Datadog tracer library directly in your application, as outlined in the manual tracer instrumentation instructions, omit this step.

  3. (Optional) Add Datadog tags.

    ENV DD_SERVICE=datadog-demo-run-java
ENV DD_ENV=datadog-demo
ENV DD_VERSION=1

  4. Change the entrypoint to wrap your application in the Datadog serverless-init process. Note: If you already have an entrypoint defined inside your Dockerfile, see the alternative configuration.

    ENTRYPOINT ["/app/datadog-init"]

  5. Execute your binary application wrapped in the entrypoint. Adapt this line to your needs.

    CMD ["./mvnw", "spring-boot:run"]

Alternative configuration

If you already have an entrypoint defined inside your Dockerfile, you can instead modify the CMD argument.

COPY --from=datadog/serverless-init:1 /datadog-init /app/datadog-init
ADD 'https://dtdg.co/latest-java-tracer' /dd_tracer/java/dd-java-agent.jar
ENV DD_SERVICE=datadog-demo-run-java
ENV DD_ENV=datadog-demo
ENV DD_VERSION=1
CMD ["/app/datadog-init", "./mvnw", "spring-boot:run"]

If you require your entrypoint to be instrumented as well, you can swap your entrypoint and CMD arguments instead. For more information, see How serverless-init works.

COPY --from=datadog/serverless-init:1 /datadog-init /app/datadog-init
ADD 'https://dtdg.co/latest-java-tracer' /dd_tracer/java/dd-java-agent.jar
ENV DD_SERVICE=datadog-demo-run-java
ENV DD_ENV=datadog-demo
ENV DD_VERSION=1
ENTRYPOINT ["/app/datadog-init"]
CMD ["your_entrypoint.sh", "./mvnw", "spring-boot:run"]

As long as your command to run is passed as an argument to datadog-init, you will receive full instrumentation.

Manually install the Go tracer before you deploy your application. Add the following instructions and arguments to your Dockerfile.

COPY --from=datadog/serverless-init:1 /datadog-init /app/datadog-init
ENTRYPOINT ["/app/datadog-init"]
ENV DD_SERVICE=datadog-demo-run-go
ENV DD_ENV=datadog-demo
ENV DD_VERSION=1
CMD ["/path/to/your-go-binary"]

Explanation

  1. Copy the Datadog serverless-init into your Docker image.

    COPY --from=datadog/serverless-init:1 /datadog-init /app/datadog-init

  2. Change the entrypoint to wrap your application in the Datadog serverless-init process. Note: If you already have an entrypoint defined inside your Dockerfile, see the alternative configuration.

    ENTRYPOINT ["/app/datadog-init"]

  3. (Optional) Add Datadog tags.

    ENV DD_SERVICE=datadog-demo-run-go
ENV DD_ENV=datadog-demo
ENV DD_VERSION=1

  4. Execute your binary application wrapped in the entrypoint. Adapt this line to your needs.

    CMD ["/path/to/your-go-binary"]

Alternative configuration

If you already have an entrypoint defined inside your Dockerfile, you can instead modify the CMD argument.

COPY --from=datadog/serverless-init:1 /datadog-init /app/datadog-init
ENV DD_SERVICE=datadog-demo-run-go
ENV DD_ENV=datadog-demo
ENV DD_VERSION=1
CMD ["/app/datadog-init", "/path/to/your-go-binary"]

If you require your entrypoint to be instrumented as well, you can swap your entrypoint and CMD arguments instead. For more information, see How serverless-init works.

COPY --from=datadog/serverless-init:1 /datadog-init /app/datadog-init
ENV DD_SERVICE=datadog-demo-run-go
ENV DD_ENV=datadog-demo
ENV DD_VERSION=1
ENTRYPOINT ["/app/datadog-init"]
CMD ["your_entrypoint.sh", "/path/to/your-go-binary"]

As long as your command to run is passed as an argument to datadog-init, you will receive full instrumentation.

Note: You can also use Orchestrion, a tool for automatically instrumenting Go code. Orchestrion is in private beta. For more information, open a GitHub issue in the Orchestrion repo, or contact Support.

Add the following instructions and arguments to your Dockerfile.

COPY --from=datadog/serverless-init:1 /datadog-init /app/datadog-init
COPY --from=datadog/dd-lib-dotnet-init /datadog-init/monitoring-home/ /dd_tracer/dotnet/
ENV DD_SERVICE=datadog-demo-run-dotnet
ENV DD_ENV=datadog-demo
ENV DD_VERSION=1
ENTRYPOINT ["/app/datadog-init"]
CMD ["dotnet", "helloworld.dll"]

Explanation

  1. Copy the Datadog serverless-init into your Docker image.

    COPY --from=datadog/serverless-init:1 /datadog-init /app/datadog-init

  2. Copy the Datadog .NET tracer into your Docker image.

    COPY --from=datadog/dd-lib-dotnet-init /datadog-init/monitoring-home/ /dd_tracer/dotnet/

    If you install the Datadog tracer library directly in your application, as outlined in the manual tracer instrumentation instructions, omit this step.

  3. (Optional) Add Datadog tags.

    ENV DD_SERVICE=datadog-demo-run-dotnet
ENV DD_ENV=datadog-demo
ENV DD_VERSION=1

  4. Change the entrypoint to wrap your application in the Datadog serverless-init process. Note: If you already have an entrypoint defined inside your Dockerfile, see the alternative configuration.

    ENTRYPOINT ["/app/datadog-init"]

  5. Execute your binary application wrapped in the entrypoint. Adapt this line to your needs.

    CMD ["dotnet", "helloworld.dll"]

Alternative configuration

If you already have an entrypoint defined inside your Dockerfile, you can instead modify the CMD argument.

COPY --from=datadog/serverless-init:1 /datadog-init /app/datadog-init
COPY --from=datadog/dd-lib-dotnet-init /datadog-init/monitoring-home/ /dd_tracer/dotnet/
ENV DD_SERVICE=datadog-demo-run-dotnet
ENV DD_ENV=datadog-demo
ENV DD_VERSION=1
CMD ["/app/datadog-init", "dotnet", "helloworld.dll"]

If you require your entrypoint to be instrumented as well, you can swap your entrypoint and CMD arguments instead. For more information, see How serverless-init works.

COPY --from=datadog/serverless-init:1 /datadog-init /app/datadog-init
COPY --from=datadog/dd-lib-dotnet-init /datadog-init/monitoring-home/ /dd_tracer/dotnet/
ENV DD_SERVICE=datadog-demo-run-dotnet
ENV DD_ENV=datadog-demo
ENV DD_VERSION=1
ENTRYPOINT ["/app/datadog-init"]
CMD ["your_entrypoint.sh", "dotnet", "helloworld.dll"]

As long as your command to run is passed as an argument to datadog-init, you will receive full instrumentation.

Manually install the Ruby tracer before you deploy your application. See the example application.

Add the following instructions and arguments to your Dockerfile.

COPY --from=datadog/serverless-init:1 /datadog-init /app/datadog-init
ENV DD_SERVICE=datadog-demo-run-ruby
ENV DD_ENV=datadog-demo
ENV DD_VERSION=1
ENV DD_TRACE_PROPAGATION_STYLE=datadog
ENTRYPOINT ["/app/datadog-init"]
CMD ["rails", "server", "-b", "0.0.0.0"]

Explanation

  1. Copy the Datadog serverless-init into your Docker image.

    COPY --from=datadog/serverless-init:1 /datadog-init /app/datadog-init

  2. (Optional) add Datadog tags

    ENV DD_SERVICE=datadog-demo-run-ruby
ENV DD_ENV=datadog-demo
ENV DD_VERSION=1

  3. This environment variable is needed for trace propagation to work properly in Cloud Run. Ensure that you set this variable for all Datadog-instrumented downstream services.

    ENV DD_TRACE_PROPAGATION_STYLE=datadog

  4. Change the entrypoint to wrap your application in the Datadog serverless-init process. Note: If you already have an entrypoint defined inside your Dockerfile, see the alternative configuration.

    ENTRYPOINT ["/app/datadog-init"]

  5. Execute your binary application wrapped in the entrypoint. Adapt this line to your needs.

    CMD ["rails", "server", "-b", "0.0.0.0"]

Alternative configuration

If you already have an entrypoint defined inside your Dockerfile, you can instead modify the CMD argument.

COPY --from=datadog/serverless-init:1 /datadog-init /app/datadog-init
ENV DD_SERVICE=datadog-demo-run-ruby
ENV DD_ENV=datadog-demo
ENV DD_VERSION=1
ENV DD_TRACE_PROPAGATION_STYLE=datadog
CMD ["/app/datadog-init", "rails", "server", "-b", "0.0.0.0"]

If you require your entrypoint to be instrumented as well, you can swap your entrypoint and CMD arguments instead. For more information, see How serverless-init works.

COPY --from=datadog/serverless-init:1 /datadog-init /app/datadog-init
ENV DD_SERVICE=datadog-demo-run-ruby
ENV DD_ENV=datadog-demo
ENV DD_VERSION=1
ENV DD_TRACE_PROPAGATION_STYLE=datadog
ENTRYPOINT ["/app/datadog-init"]
CMD ["your_entrypoint.sh", "rails", "server", "-b", "0.0.0.0"]

As long as your command to run is passed as an argument to datadog-init, you will receive full instrumentation.

Add the following instructions and arguments to your Dockerfile.

COPY --from=datadog/serverless-init:1 /datadog-init /app/datadog-init
ADD https://github.com/DataDog/dd-trace-php/releases/latest/download/datadog-setup.php /datadog-setup.php
RUN php /datadog-setup.php --php-bin=all
ENV DD_SERVICE=datadog-demo-run-php
ENV DD_ENV=datadog-demo
ENV DD_VERSION=1
ENTRYPOINT ["/app/datadog-init"]

# use the following for an Apache and mod_php based image
RUN sed -i "s/Listen 80/Listen 8080/" /etc/apache2/ports.conf
EXPOSE 8080
CMD ["apache2-foreground"]

# use the following for an Nginx and php-fpm based image
RUN ln -sf /dev/stdout /var/log/nginx/access.log && ln -sf /dev/stderr /var/log/nginx/error.log
EXPOSE 8080
CMD php-fpm; nginx -g daemon off;

Note: The datadog-init entrypoint wraps your process and collects logs from it. To get logs working properly, ensure that your Apache, Nginx, or PHP processes are writing output to stdout.

Explanation

  1. Copy the Datadog serverless-init into your Docker image.

    COPY --from=datadog/serverless-init:1 /datadog-init /app/datadog-init

  2. Copy and install the Datadog PHP tracer.

    ADD https://github.com/DataDog/dd-trace-php/releases/latest/download/datadog-setup.php /datadog-setup.php
RUN php /datadog-setup.php --php-bin=all

    If you install the Datadog tracer library directly in your application, as outlined in the manual tracer instrumentation instructions, omit this step.

  3. (Optional) Add Datadog tags.

    ENV DD_SERVICE=datadog-demo-run-php
ENV DD_ENV=datadog-demo
ENV DD_VERSION=1

  4. Change the entrypoint to wrap your application in the Datadog serverless-init process. Note: If you already have an entrypoint defined inside your Dockerfile, see the alternative configuration.

    ENTRYPOINT ["/app/datadog-init"]

  5. Execute your application.

    Use the following for an apache and mod_php based image:

    RUN sed -i "s/Listen 80/Listen 8080/" /etc/apache2/ports.conf
EXPOSE 8080
CMD ["apache2-foreground"]

    Use the following for an nginx and php-fpm based image:

    RUN ln -sf /dev/stdout /var/log/nginx/access.log && ln -sf /dev/stderr /var/log/nginx/error.log
EXPOSE 8080
CMD php-fpm; nginx -g daemon off;

Alternative configuration: CMD argument

If you already have an entrypoint defined inside your Dockerfile, and you are using an Apache and mod_php based image, you can instead modify the CMD argument.

COPY --from=datadog/serverless-init:1 /datadog-init /app/datadog-init
ADD https://github.com/DataDog/dd-trace-php/releases/latest/download/datadog-setup.php /datadog-setup.php
RUN php /datadog-setup.php --php-bin=all
ENV DD_SERVICE=datadog-demo-run-php
ENV DD_ENV=datadog-demo
ENV DD_VERSION=1
RUN sed -i "s/Listen 80/Listen 8080/" /etc/apache2/ports.conf
EXPOSE 8080
CMD ["/app/datadog-init", "apache2-foreground"]

If you require your entrypoint to be instrumented as well, you can swap your entrypoint and CMD arguments instead. For more information, see How serverless-init works.

COPY --from=datadog/serverless-init:1 /datadog-init /app/datadog-init
ADD https://github.com/DataDog/dd-trace-php/releases/latest/download/datadog-setup.php /datadog-setup.php
RUN php /datadog-setup.php --php-bin=all
ENV DD_SERVICE=datadog-demo-run-php
ENV DD_ENV=datadog-demo
ENV DD_VERSION=1
ENTRYPOINT ["/app/datadog-init"]

# use the following for an Apache and mod_php based image
RUN sed -i "s/Listen 80/Listen 8080/" /etc/apache2/ports.conf
EXPOSE 8080
CMD ["your_entrypoint.sh", "apache2-foreground"]

# use the following for an Nginx and php-fpm based image
RUN ln -sf /dev/stdout /var/log/nginx/access.log && ln -sf /dev/stderr /var/log/nginx/error.log
EXPOSE 8080
CMD your_entrypoint.sh php-fpm; your_entrypoint.sh nginx -g daemon off;

As long as your command to run is passed as an argument to datadog-init, you will receive full instrumentation.

2. Configure your application

Once the container is built and pushed to your registry, the last step is to set the required environment variables for the Datadog Agent:

  • DD_API_KEY: Datadog API key, used to send data to your Datadog account. It should be configured as a Azure Secret for privacy and safety issue.

  • DD_SITE: Datadog endpoint and website. Select your site on the right side of this page. Your site is: .

  • DD_AZURE_SUBSCRIPTION_ID: The Azure Subscription ID associated with the Container App resource (Required).

  • DD_AZURE_RESOURCE_GROUP: The Azure Resouce Group associated with the Container App resource (Required).

  • DD_TRACE_ENABLED: Set to true to enable tracing.

For more environment variables and their function, see Additional Configurations.

This command deploys the service and allows any external connection to reach it. Set DD_API_KEY as an environment variable, and set your service listening to port 80.

az containerapp up \
  --name APP_NAME \
  --resource-group RESOURCE_GROUP \
  --ingress external \
  --target-port 80 \
  --env-vars "DD_API_KEY=$DD_API_KEY" "DD_TRACE_ENABLED=true" "DD_SITE='datadoghq.com'" \
  --image YOUR_REGISTRY/YOUR_PROJECT

3. Results

Once the deployment is completed, your metrics and traces are sent to Datadog. In Datadog, navigate to Infrastructure->Serverless to see your serverless metrics and traces.

Additional configurations

  • Advanced Tracing: The Datadog Agent already provides some basic tracing for popular frameworks. Follow the advanced tracing guide for more information.

  • Logs: If you use the Azure integration, your logs are already being collected. Alternatively, you can set the DD_LOGS_ENABLED environment variable to true to capture application logs through the serverless instrumentation directly.

  • Custom Metrics: You can submit custom metrics using a DogStatsd client. For monitoring Cloud Run and other serverless applications, use distribution metrics. Distributions provide avg, sum, max, min, and count aggregations by default. On the Metric Summary page, you can enable percentile aggregations (p50, p75, p90, p95, p99) and also manage tags. To monitor a distribution for a gauge metric type, use avg for both the time and space aggregations. To monitor a distribution for a count metric type, use sum for both the time and space aggregations.

  • Trace Sampling: To manage the APM traced request sampling rate for serverless applications, set the DD_TRACE_SAMPLE_RATE environment variable on the function to a value between 0.000 (no tracing of Container App requests) and 1.000 (trace all Container App requests).

Metrics are calculated based on 100% of the application’s traffic, and remain accurate regardless of any sampling configuration.

Environment Variables

VariableDescription
DD_API_KEYDatadog API Key - Required
DD_SITEDatadog site - Required
DD_LOGS_ENABLEDWhen true, send logs (stdout and stderr) to Datadog. Defaults to false.
DD_LOGS_INJECTIONWhen true, enrich all logs with trace data for supported loggers in Java, Node.js, .NET, and PHP. See additional docs for Python, Go, and Ruby.
DD_TRACE_SAMPLE_RATEControls the trace ingestion sample rate 0.0 and 1.0
DD_SERVICESee Unified Service Tagging.
DD_VERSIONSee Unified Service Tagging.
DD_ENVSee Unified Service Tagging.
DD_SOURCESee Unified Service Tagging.
DD_TAGSSee Unified Service Tagging.

Troubleshooting

This integration depends on your runtime having a full SSL implementation. If you are using a slim image for Node, you may need to add the following command to your Dockerfile to include certificates.

RUN apt-get update && apt-get install -y ca-certificates

Further reading

Additional helpful documentation, links, and articles:

Collect traces, logs, and custom metrics from Container Apps servicesBLOG more more