cadvisor dockerfile healthchecks do not utilize correct port if --port command is used to change from default 8080

[JerrettDavis]

The Dockerfile utilizes a static port 8080 for the healthcheck and expose operations:

cadvisor/deploy/Dockerfile

Line 68 in 255cff7

ENV CADVISOR_HEALTHCHECK_URL=http://localhost:8080/healthz

If a non-default port is utilized, users have to explicitly set the CADVISORT_HEALTHCHECK_URL environment variable to reflect the updated port otherwise the status will remain "unhealthy".

  cadvisor:
    image: gcr.io/cadvisor/cadvisor:latest
    container_name: cadvisor
    command:
      - '-port=9092'
    expose:
      - 9092
    ports:
      - 9092:9092
    environment:
      - 'CADVISOR_HEALTHCHECK_URL=http://localhost:9092/healthz'