Docker For Mac Socat

Socat daemon on OSX for Docker. GitHub Gist: instantly share code, notes, and snippets. Socat daemon on OSX for Docker. GitHub Gist: instantly share code, notes, and snippets. Skip to content. All gists Back to GitHub. Sign in Sign up Instantly share code, notes, and snippets. Djangofan / socat-config.sh. I haven't been following the linux sound device development (ALSA appears to be the current version with /dev/snd). However, the mic and speakers tend to be handled together, so if you want the mic from the Mac to be reachable inside the container, you'll need to pass this through to the VM and then into the container, a very non-trivial task considering the different OS's involved.

Docker Desktop for Mac provides several networking features to make iteasier to use.

Features

VPN Passthrough

Docker Desktop for Mac’s networking can work when attached to a VPN. To do this,Docker Desktop for Mac intercepts traffic from the containers and injects it intoMac as if it originated from the Docker application.

Port Mapping

When you run a container with the -p argument, for example:

Docker Desktop for Mac makes whatever is running on port 80 in the container (inthis case, nginx) available on port 80 of localhost. In this example, thehost and container ports are the same. What if you need to specify a differenthost port? If, for example, you already have something running on port 80 ofyour host machine, you can connect the container to a different port:

Now, connections to localhost:8000 are sent to port 80 in the container. Thesyntax for -p is HOST_PORT:CLIENT_PORT.

HTTP/HTTPS Proxy Support

See Proxies.

Known limitations, use cases, and workarounds

Following is a summary of current limitations on the Docker Desktop for Macnetworking stack, along with some ideas for workarounds.

There is no docker0 bridge on macOS

Because of the way networking is implemented in Docker Desktop for Mac, you cannot see adocker0 interface on the host. This interface is actually within the virtualmachine.

I cannot ping my containers

Docker Desktop for Mac can’t route traffic to containers.

Per-container IP addressing is not possible

The docker (Linux) bridge network is not reachable from the macOS host.

Use cases and workarounds

There are two scenarios that the above limitations affect:

I want to connect from a container to a service on the host

The host has a changing IP address (or none if you have no network access). From18.03 onwards our recommendation is to connect to the special DNS namehost.docker.internal, which resolves to the internal IP address used by thehost.This is for development purpose and will not work in a production environment outside of Docker Desktop for Mac.

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The gateway is also reachable as gateway.docker.internal.

I want to connect to a container from the Mac

Port forwarding works for localhost; --publish, -p, or -P all work.Ports exposed from Linux are forwarded to the host.

Our current recommendation is to publish a port, or to connect from anothercontainer. This is what you need to do even on Linux if the container is on anoverlay network, not a bridge network, as these are not routed.

The command to run the nginx webserver shown in Getting Startedis an example of this.

To clarify the syntax, the following two commands both expose port 80 on thecontainer to port 8000 on the host:

To expose all ports, use the -P Trackgod 2 expansions. flag. For example, the following commandstarts a container (in detached mode) and the -P exposes all ports on thecontainer to random ports on the host.

See the run command for more details onpublish options used with docker run.