Where things are in docker

You will use different addresses to reach the same service depending on whether you are in the host system, or inside one of your containers. This information can be found in the docker-compose.yml file. For example:

  fcrepo:
    image: nulib/fcrepo4:4.7.5
    ports:
      - "8984:8080"

creates a service called fcrepo based on a docker image that runs fedora on port 8080. Thus, from another container its address is http://fcrepo:8080/. Since the 'ports' section maps it to port 8984, you can reach it from your host system at http://localhost:8984. If you leave out the 'ports' section, the service would be inaccessible from outside docker.

The most useful service addresses here are:

Service	from host	from containers
hyrax	http://localhost:3000	http://web:3000/
solr	http://localhost:8983/solr/#/	http://solr:8983/solr/hyrax
fedora	http://localhost:8984/rest	http://fcrepo:8080/rest
test solr	http://localhost:8985/solr/#/	http://solr_test:8983/solr/hyrax
test fedora	http://localhost:8986/rest	http://fcrepo_test:8080/rest

(I've shown URL for the solr web console from the host, but its API endpoint from the container, but either one could be reached in the other context)