On Docker for Mac what would be the host ip as seen from the container?

Question

I need to setup a debugger on my container, that requires me to set the remote (docker host) IP. In different tutorials I find different IP addresses listed as possible solution. In my container I ran a webserver that showed me that connections made to the container from my host machine come from 172.19.0.1. This is on Docker for Mac version 1.11.x.

But how would I reliably find out the host IP as seen from the container on Docker for Mac? When would it be possible for this IP to change?

Edit: Duplicate of https://stackoverflow.com/a/24716645/6309

@VonC it is not a duplicate as this question concerns "Docker for Mac" which has some important difference in the archtecture — ciekawy, Aug 04 '16 at 21:35
can you precise where is the listening service and where is the client initiating connection (on mac host or inside the container)? to connect from the container to mac host its enough to use the main mac host ip which is usually the `en0`. For the opposite direction looks like currently the only way is to use the usual docker port mapping like `-p 1234:1234` — ciekawy, Aug 04 '16 at 21:46

score 10 · Answer 1 · edited Aug 18 '16 at 21:40

10

You can get the ip of the host from within the container by running this command:

/sbin/ip route|awk '/default/ { print $3 }'

edited Aug 18 '16 at 21:40

fotinakis

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answered Aug 04 '16 at 19:45

Kevin Simper

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I get the IP address, but I'm unable to connect to it from the container... – Tyguy7 Oct 11 '16 at 19:32
It must the way you connect to the ip then? – Kevin Simper Oct 11 '16 at 22:49
Check if a network route is available from your container network (aka docker0) and your host machine, probably not :/ – Thomas Decaux Jan 31 '17 at 12:28
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what exactly is this command doing? – Robbo_UK Mar 05 '17 at 15:31
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As of Docker 17.06 you can use **docker.for.mac.localhost** which should resolve to the correct host ip – David Soroko Sep 29 '17 at 11:46
This last comment here should be the accepted answer. As @ciekawy has mentioned, this is not a duplicate, because it concerns docker for mac. – tomas May 23 '18 at 19:58

On Docker for Mac what would be the host ip as seen from the container?

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