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Profiling in Docker container

To profile a Java application or a server running in a Docker container, you should run it with the profiler agent, and then use remote profiling in the profiler UI, as described below.

On Docker side

(1) Add few lines to your image's Dockerfile.

  • (1.1) Install YourKit Java Profiler agents:

    RUN wget https://www.yourkit.com/download/docker/YourKit-JavaProfiler-2019.1-docker.zip -P /tmp/ && \
      unzip /tmp/YourKit-JavaProfiler-2019.1-docker.zip -d /usr/local && \
      rm /tmp/YourKit-JavaProfiler-2019.1-docker.zip
  • (1.2) If you use Alpine Linux, install libc6-compat.

    RUN apk add --no-cache libc6-compat
  • (1.3) Expose the profiler agent port. For example, if you specify the port with the agent startup option port=10001 (see below), add the following line.

    EXPOSE 10001

    Note: we use the same example port 10001 throughout these instructions. If you decide to change it, please ensure you have changed it everywhere.

  • (1.4) Load the agent to the JVM by adding the Java command line option -agentpath.

    For example, if you start your application with

    java -jar my-app.jar

    ...do it like this:

    java -agentpath:/usr/local/YourKit-JavaProfiler-2019.1/bin/linux-x86-64/libyjpagent.so=port=10001,listen=all -jar my-app.jar

    Please find detailed description of how to specify -agentpath and choose the agent startup options here.

(2) After modifying Dockerfile, don't forget to build the container.

(3) While running your Docker container make the agent port visible with the option -p:

docker run -p 10001:10001 your-docker

Connect to the profiled application

When the application is running in the container, connect to it from the profiler UI to perform profiling.

Note: if you're running Docker locally on your developer machine, connect to localhost.