Networking For Mac



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  1. Networking For Managers
  2. Networking Labs For Mac

If you want to go under the hood, Apple includes a suite of tools on your Mac to help you troubleshoot networking issues; they’re all included in the Network Utility app, which you can find in. Now, connections to localhost:8000 are sent to port 80 in the container. The syntax for -p is HOSTPORT:CLIENTPORT. HTTP/HTTPS Proxy Support. Known limitations, use cases, and workarounds. Following is a summary of current limitations on the Docker Desktop for Mac networking stack, along with some ideas for workarounds.

I've spent the whole morning trying to get my windows 10 laptop to acknowledge the existence of my Mac while they are on the same network. The mac can see the PC and connect to it, but from the PC side the mac is invisible.


Notes:

  • I have a windows 10 laptop connected to the same network as my office Mac.
  • I have file sharing enabled on both devices and am able to see & connect to the laptop's shared folders/files from the mac without any trouble.
  • I can see the mac and access folders on other macs in the network
  • My windows laptop is able to see other devices on the network, but not my mac.

iMac, macOS High Sierra (10.13.2)

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

Features

VPN Passthrough

Networking For Managers

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). We recommend that you 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.

Networking

You can also reach the gateway using gateway.docker.internal.

If you have installed Python on your machine, use the following instructions as an example to connect from a container to a service on the host:

  1. Run the following command to start a simple HTTP server on port 8000.

    python -m http.server 8000

    If you have installed Python 2.x, run python -m SimpleHTTPServer 8000.

  2. Now, run a container, install curl, and try to connect to the host using the following commands:

Macs

I want to connect to a container from the Mac

Networking

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

Networking Labs For Mac

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.

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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 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.

mac, networking