Update hosts file in all containers

Question

Is there anyway I can get Docker to update the /etc/hosts of all containers?

I want each container running on the host machine to know the hostname of all other containers running on the host machine.

score 1 · Answer 1 · answered Dec 07 '14 at 00:10

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You could use next approach: use own dns server (dnsmasq is easy choice) and update it with addresses of all running containers dynamically (either via polling or using docker events). Here couple of samples: 1, 2, 3.

answered Dec 07 '14 at 00:10

ISanych

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score 0 · Answer 2 · answered Dec 05 '14 at 11:14

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Yes, you can. It is automatically done when you link the containers: https://docs.docker.com/userguide/dockerlinks/#updating-the-etchosts-file

answered Dec 05 '14 at 11:14

dukebody

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I tried this but only the parent container knows the child containers hostname. The child container doesn't know the parents hostname. The link is one way it seems. – DarVar Dec 05 '14 at 11:18
hmmmm see http://stackoverflow.com/questions/25324860/how-to-create-a-bidirectional-link-between-containers – dukebody Dec 05 '14 at 11:23
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see also http://stackoverflow.com/questions/27048319/docker-linking-how-can-both-containers-know-each-others-ip/27067586#27067586 – Bryan Dec 05 '14 at 12:11

errordeveloper · Answer 3 · 2014-12-07T11:51:43.587

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You can try using weave, which is a project I am working on. It gives you an overlay network with DNS, so you can forget about the hosts files, linked containers and most of those things.

edited Dec 07 '14 at 11:51

answered Dec 07 '14 at 11:26

errordeveloper

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Update hosts file in all containers

3 Answers3