1. Documentation
  2. Blackfire for Python
  3. Integrations
  4. Python Probe with Docker

Python Probe with Docker Python

Enabling the Python Probe

To be able to use Blackfire, add the probe to your Docker PHP image. Here is an example of a Dockerfile based on the official Docker Python image:

1
2
3
FROM python:3.9-buster

RUN pip install --upgrade pip blackfire

Note

Base image

This example targets official Python Docker images. If you are using a custom image, you probably need to adapt it.

Build your container as usual:

1
docker build -t python-blackfire .

Note

Upgrading

To upgrade the Probe, rebuild your Python container and relaunch it (you might need to use the --no-cache option to force the download of the latest Probe version).

Docker Compose

If you use docker compose, you can connect your Python container and the agent using the following snippet:

or to display your Blackfire credentials.

version: '3'
services:
  app:
    build: .
    ports:
      - "8080:80"

  blackfire:
    image: blackfire/blackfire:2
    environment:
        # Exposes BLACKFIRE_SERVER_* environment variables from the host:
        BLACKFIRE_SERVER_ID: <YOUR_BLACKFIRE_SERVER_ID>
        BLACKFIRE_SERVER_TOKEN: <YOUR_BLACKFIRE_SERVER_TOKEN>

        # Exposes BLACKFIRE_CLIENT_* environment variables
        # allowing the client to communicate with Blackfire's API:
        BLACKFIRE_CLIENT_ID: <YOUR_BLACKFIRE_CLIENT_ID>
        BLACKFIRE_CLIENT_TOKEN: <YOUR_BLACKFIRE_CLIENT_TOKEN>

Using the Client for CLI Profiling

When profiling command line scripts, the process is slightly different than for HTTP requests.

You execute blackfire run which in the end runs an embedded agent and wraps your Python script with the required environment variables. Therefore, in this configuration you do not need to (and cannot) use the blackfire/blackfire image.

Instead, you need to fetch and use the blackfire client binary inside your Python container.

Installing Blackfire Client

Here is an example of a Dockerfile based on the official Docker Python image that retrieves the client at build time:

1
2
3
4
5
6
7
8
FROM python:3.9-buster

RUN pip install --upgrade pip blackfire
RUN mkdir -p /tmp/blackfire \
    && architecture=$(uname -m) \
    && curl -A "Docker" -L https://blackfire.io/api/v1/releases/cli/linux/$architecture | tar zxp -C /tmp/blackfire \
    && mv /tmp/blackfire/blackfire /usr/bin/blackfire \
    && rm -Rf /tmp/blackfire

Build your container as usual:

1
docker build -t python-blackfire .

Debugging the Python Probe

By default, the Probe is quiet and does not produce logs. To debug issues, pass -e BLACKFIRE_LOG_LEVEL=4 to the docker run command, and tail the logs via Docker:

1
docker logs -f PYTHON_CONTAINER_ID

Installing the Agent

To install the Blackfire Agent using Docker, please refer to the dedicated documentation page.