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dockerfig

Add to container's /etc/hosts using Fig?

I'm trying to configure fig so that I can connect to my database server without specifying a fully qualified domain name. The database is running on bare metal (not in docker). On the host, glinda.local is specified in /etc/hosts and I'd like the container to mimic this behavior (though not rely on the host's config).

I found this suggestion on github, but it fails since /etc/hosts is on a read-only file system.

So the question remains, how can I add glinda.local from fig.yml to /etc/hosts inside my docker container?

Solution

  • From Docker v1.3.1 (I think) you have available the option --add-host in docker run. Unfortunately this options has not been merged to fig:master yet, but there is a PR with it. When merged (or using that branch) you should be able to use it in this way:

    extra_hosts

    Add hostname mappings. Use the same values as the docker client --add-hosts parameter.

    > extra_hosts:
>  - docker: 162.242.195.82
>  - fig: 50.31.209.229

    An entry with the ip address and hostname will be created in /etc/hosts inside containers for this service, e.g:

    > 162.242.195.82  docker
> 50.31.209.229   fig