Running Packetbeat on Docker

Docker images for Packetbeat are available from the Elastic Docker registry. You can retrieve an image with a docker pull command.

docker pull docker.elastic.co/beats/packetbeat:6.2.4

The base image is centos:7 and the source code can be found on GitHub.

The Docker image provides several methods for configuring Packetbeat. The conventional approach is to provide a configuration file via a bind mount, but it’s also possible to create a custom image with your configuration included.

One way to configure Packetbeat on Docker is to provide packetbeat.yml via a bind mount. With docker run, the bind mount can be specified like this:

docker run \
  --mount type=bind,source="$(pwd)"/packetbeat.yml,target=/usr/share/packetbeat/packetbeat.yml \
  docker.elastic.co/beats/packetbeat:6.2.4

It’s possible to embed your Packetbeat configuration in a custom image. Here is an example Dockerfile to achieve this:

FROM docker.elastic.co/beats/packetbeat:6.2.4
COPY packetbeat.yml /usr/share/packetbeat/packetbeat.yml
USER root
RUN chown packetbeat /usr/share/packetbeat/packetbeat.yml
USER packetbeat

Under Docker, Packetbeat runs as a non-root user, but requires some privileged network capabilities to operate correctly. Ensure that the NET_ADMIN capability is available to the container.

docker run --cap-add=NET_ADMIN docker.elastic.co/beats/packetbeat:6.2.4

By default, Docker networking will connect the Packetbeat container to an isolated virtual network, with a limited view of network traffic. You may wish to connect the container directly to the host network in order to see traffic destined for, and originating from, the host system. With docker run, this can be achieved by specifying --network=host.

docker run --cap-add=NET_ADMIN --network=host docker.elastic.co/beats/packetbeat:6.2.4