Networking features in Docker for MacEstimated reading time: 3 minutes
Docker for Mac provides several networking features to make it easier to use.
Docker for Mac’s networking can work when attached to a VPN. To do this, Docker for Mac intercepts traffic from the containers and injects it into Mac as if it originated from the Docker application.
When you run a container with the
-p argument, for example:
$ docker run -p 80:80 -d nginx
Docker for Mac makes whatever is running on port 80 in the container (in
nginx) available on port 80 of
localhost. In this example, the
host and container ports are the same. What if you need to specify a different
host port? If, for example, you already have something running on port 80 of
your host machine, you can connect the container to a different port:
$ docker run -p 8000:80 -d nginx
Now, connections to
localhost:8000 are sent to port 80 in the container. The
HTTP/HTTPS Proxy Support
Known limitations, use cases, and workarounds
Following is a summary of current limitations on the Docker for Mac networking stack, along with some ideas for workarounds.
There is no docker0 bridge on macOS
Because of the way networking is implemented in Docker for Mac, you cannot see a
docker0 interface on the host. This interface is actually within the virtual
I cannot ping my containers
Docker 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). From
18.03 onwards our recommendation is to connect to the special DNS name
host.docker.internal, which resolves to the internal IP address used by the
The gateway is also reachable as
I want to connect to a container from the Mac
Port forwarding works for
-P all work.
Ports exposed from Linux are forwarded to the host.
Our current recommendation is to publish a port, or to connect from another container. This is what you need to do even on Linux if the container is on an overlay network, not a bridge network, as these are not routed.
The command to run the
nginx webserver shown in Getting
an example of this.
$ docker run -d -p 80:80 --name webserver nginx
To clarify the syntax, the following two commands both expose port
80 on the
container to port
8000 on the host:
$ docker run --publish 8000:80 --name webserver nginx $ docker run -p 8000:80 --name webserver nginx
To expose all ports, use the
-P flag. For example, the following command
starts a container (in detached mode) and the
-P exposes all ports on the
container to random ports on the host.
$ docker run -d -P --name webserver nginx
See the run command for more details on
publish options used with