Docker Network Nginx Resolver

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First off, you should be using the Docker embedded DNS server at 127.0.0.11.

Your problem could be caused by 1 of the following:

  1. nginx is trying to use IPv6 (AAAA record) for the DNS queries.

    See https://stackoverflow.com/a/35516395/1529493 for the solution.

    Basically something like:

    http {
    resolver 127.0.0.11 ipv6=off;
}

    This is probably no longer a problem with Docker 1.11:

    Fix to not forward docker domain IPv6 queries to external servers
    (#21396)

  2. Take care that you don’t accidentally override the resolver configuration directive. In my case I had in the server block resolver 8.8.8.8 8.8.4.4; from Mozilla’s SSL Configuration Generator, which was overriding the resolver 127.0.0.11; in the http block. That had me scratching my head for a long time…

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