Deploying Docker Flow Monitor

Deploying Docker Flow Monitor is easy (as almost all Docker services are). We'll start by creating a network called monitor. We could let Docker stack create it for us, but it is useful to have it defined externally so that we can easily attach it to services from other stacks:

docker network create -d overlay monitor  

The stack is as follows:

version: "3" 
services: 
  monitor: 
    image: vfarcic/docker-flow-monitor:${TAG:-latest} 
    environment: 
      - GLOBAL_SCRAPE_INTERVAL=10s 
    networks: 
      - monitor 
    ports: 
      - 9090:9090 
networks: 
    monitor: 
       external: true 

The environment variable GLOBAL_SCRAPE_INTERVAL shows the first improvement over the "original" Prometheus service. It allows us to define entries of its configuration as environment variables. That, in itself, is not a significant...