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I am using docker-compose to run a test environment, that consists of about 5 different containers. The inter-container links and the shared volumes (volumes-from) works wonderfully. I also expose some ports up to the host machine, which works nicely.
What I am missing is a way to link some of my real servers into this environment, without hardcoding ip address. With docker run, you could use --add-host to add another line in your /etc/hosts file. Is there any way to do something similar with docker-compose?
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Docker compose uses the Dockerfile if you add the build command to your project's docker-compose. yml. Your Docker workflow should be to build a suitable Dockerfile for each image you wish to create, then use compose to assemble the images using the build command.
Docker v 20.10 and above (since December 14th 2020)Use your internal IP address or connect to the special DNS name host. docker. internal which will resolve to the internal IP address used by the host. On Linux, using the Docker command, add --add-host=host.
In Docker for Mac and Docker for Windows, you can connect to the host out of the box by using the special DNS name: host.docker.internal. For Linux, you need the magic string host-gateway to map to the gateway inside the container. This allows you to use the hostname host.
I have great news: this will be in Compose 1.3!
I'm using it in the current RC (RC1) like this:
rng: build: rng extra_hosts: seed: 1.2.3.4 tree: 4.3.2.1 https://github.com/compose-spec/compose-spec/blob/master/spec.md#extra_hosts
extra_hosts - Add hostname mappings. Uses the same values as the docker client --add-host parameter.
extra_hosts: - "somehost:162.242.195.82" - "otherhost: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 somehost 50.31.209.229 otherhost If you love us? You can donate to us via Paypal or buy me a coffee so we can maintain and grow! Thank you!
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