docker-socat (multi-architecture socat Docker image)

Inspired by stefanprodan/dockerd-exporter⁠ with added support for ARM / ARM64 multiarchitecture images. Runs the socat program in a base alpine image. Can be used to relay arbitrary socket data or specifically export experimental Docker daemon metrics to Prometheus.

Install and Usage

Setup Docker Engine

Enable experimental metrics for docker engine⁠ for address 0.0.0.0:9323.

Check if the docker_gwbridge ip address is 172.18.0.1:

docker run --rm --net host alpine ip -o addr show docker_gwbridge

Docker Swarm

Create an overlay network:

docker network create \
  --driver overlay \
  netmon

Create dockerd-exporter global service (replace 172.18.0.1 with your docker_gwbridge address):

docker service create -d \
  --mode global \
  --name dockerd-exporter \
  --network netmon \
  -e IN="172.18.0.1:9323" \
  -e OUT="9323" \
  jmb12686/socat:latest \
  -d -d TCP-L:9323,fork TCP:172.18.0.1:9323

Configure Prometheus to scrape the dockerd-exporter instances:

scrape_configs:
- job_name: 'dockerd-exporter'
  dns_sd_configs:
  - names:
    - 'tasks.dockerd-exporter'
    type: 'A'
    port: 9323

Run Prometheus on the same overlay network as dockerd-exporter.

Build and Publish Socat Image

This image is designed to support multiarchitecture images for usage on both ARM and amd64 hosts. Setup local environment to support Docker experimental feature for building multi architecture images, buildx⁠. Follow instructions here⁠

Clone repo:

$ git clone https://github.com/jmb12686/raspi-docker-stacks
$ cd raspi-docker-stacks/prometheus/dockerd-exporter

Build multiarch image:

$ docker buildx build --platform linux/amd64,linux/arm64,linux/arm/v7 -t jmb12686/socat:latest --push .