Docker for mac kubernetes use ip other than localhost

Docker for mac kubernetes use ip other than localhost code#
Docker for mac kubernetes use ip other than localhost free#
Docker for mac kubernetes use ip other than localhost windows#

seems to work by accident rather than design рџ± It's a bit of an internal detail of Docker Desktop.

I don't know how convenient this would be to change.

docker run -v /var/run/:/var/run/docker.sock docker ps: would show the internal port.

docker run -v /var/run/docker.sock:/var/run/docker.sock docker ps: would show the host port.

It is possible to bypass the Docker API proxy which is rewriting the port number: However this still leaves the problem of discovering the internal port number. I could probably fix (1) by binding internally on 0.0.0.0 rather than 127.0.0.1 hopefully this would be safe because the Linux network namespace with dockerd is almost empty.

even if the port were available on the gateway IP, it would be the internal port rather than the external one visible in docker ps on the host.

the bugfix binds internally on 127.0.0.1 inside the Linux network namespace, so the port isn't available on the gateway IP.

fixing the bug in the bugfix, I can see 2 further problems:

works at the moment is because it's avoiding this bugfix, by accident.Д¬onsidering the possibility of making -p 80 and -p 0:80 behave the same i.e.

Docker for mac kubernetes use ip other than localhost code#

The code checks for the port being '', but not the port being '0'. There was a bug in this bugfix, in the test for 'is the user requesting a random port'. This was fixed by choosing a random port on both the host and on 127.0.0.1 in Linux, connecting them together, and rewriting the docker ps results over /var/run/docker.sock to show the correct value for the host:

Docker for mac kubernetes use ip other than localhost free#

docker run -p 80) there was a bug where dockerd would choose a port which was free inside it's network namespace, but which wasn't free on the host. When a random port is needed to expose a container (e.g.

Docker for mac kubernetes use ip other than localhost windows#

On Mac and Windows dockerd runs inside the VM, in a network namespace. I've done a bit of investigating and I believe this problem is due to the fix for docker/for-win#10008.

given the apparent simplicity of the workaround, might this actually be fixable in Docker Desktop?.

approach, or whether there's an imminent risk that this might also break?

whether we would be safe to adopt a workaround resembling the -p 0.

Taking repro script above and simply sticking a 0: in the right place seems to fix it (with Docker for Mac 3.5.2, launching the script from inside a for various use cases (particularly CI environments with 'docker wormhole' arrangements) the GATEWAY_IP:PORT pattern has, for a long time, been really quite important to us and the network+named container pattern would be quite hard for users to migrate to. I was always under the impression that -p PORT and -p 0:PORT would be effectively the same, but I'm sure there are many moving parts that make this not such a simple assertion рџ†. # Running INSIDE a container which has the docker socket volume-mounted (docker wormhole pattern):Д¬url: (7) Failed to connect to 172.17.0.1 port 58427 after 0 ms: Connection refused GATEWAY_IP= $(docker network inspect -f ' ' $CONTAINER echo echo 'Stopping $CONTAINER ' PORT= $(docker port $CONTAINER | head -n 1 | rev | cut -d: -f1 | rev ) Sleep 5 # Making sure db will be responsive #!/usr/bin/env bash echo 'Starting PostgreSQL database in container 'Д¬ONTAINER= $(docker run -d -p 5432 -e POSTGRES_USER=test -e POSTGRES_PASSWORD=test -e POSTGRES_DB=test postgres:9.6 ) echo 'PostgreSQL database started in container: $CONTAINER ' The following script would reproduce the issue, it would fail on Mac and succeed on Ubuntu: In this case the HostPort under HostConfig/ PortBindings would be the host_port we specified on both Mac and Ubuntu. If we were to specify the port we want to bind to it works fine -p. When the run a container and use the -p option to map the container's port to a randomly assigned one on the host machine, we noticed that HostPort under HostConfig and PortBindings in the container's config is set to '0', on Ubuntu it is an empty string. Not sure if it's new, we just noticed it and the not sure whether it came with an update. HostPort in the docker container's HostConfig, PortBindings` is set to '0'. When creating a docker container with an exposed port (not binding it), can reach the container from the host with localhost and the newly assigned port but not from another container with their network's gateway ip and the newly assigned port. HostPort in the docker container's HostConfig, PortBindings should be empty. When creating a docker container with an exposed port (not binding it), be able to reach the application running on it from another container in the same network using the network's gateway ip and the port the container was assigned on the host.

I have tried disabling enabled experimental features.

I have tried with the latest version of Docker Desktop.