java.net.UnknownHostException on Docker

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In my case the java application was failing with java.net.UnknownHostException when running in docker. The reason was that I used --network=none docker flag (getting ip/hostname via dhcp and pipework). In this case, docker does not add automatically to /etc/hosts entry like

127.0.0.1 15e326aecf84

And getCanonicalHostName() Java function threw this exception.

Possible solutions:

  • add hostname entry to /etc/hosts file via docker run parameter --hostname=your-hostname.com
  • switch to docker-managed network configuration

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