The machine running the Docker server is called the Docker host. The host can be any machine—your laptop, a server in the Cloud™, etc—but, because Docker uses features only available to Linux, that machine must be running Linux (more specifically, the Linux kernel). This information is as of 2018-03-31 with Docker 18.03.0-ce. I wanted to access host port from a docker container. For example, an nginx process is running on the host machine with port 8888 open, then I would like to create a container which can curl host:8888. Hence you won't see them with docker-machine and you won't see another IP address than localhost. Docker for Windows relies on the HyperV hypervisor which allows a network connection to tcp://localhost:2375. Docker for Mac relies on the xhyve hypervisor, the way it's implemented only provides a connection through the socket unix:///var/run.
- Docker Container IP Address. By default, the container is assigned an IP address for every Docker network it connects to. And each network is created with a default subnet mask, using it as a pool later on to give away the IP addresses. Usually Docker uses the default 172.17. 0.0/16 subnet for container networking.
- You will also need to setup routing from your Mac to the container networks via your VM’s new IP address. In my case the Docker network range is 172.22.0.0/16 and the Host Only adapter IP on the VM is 192.168.99.100. Sudo route add 172.22.0.0/16 192.168.99.100 Adding a permanent route to osx is bit more complex.
This is just a quick update to let you know that we’ve released another preview of Docker Desktop for Apple M1 chips, which you can download from our Docker Apple M1 Tech Preview page. The most exciting change in this version is that Kubernetes now works.
First, a big thank you to everyone who tried out the previous preview and gave us feedback. We’re really excited to see how much enthusiasm there is for this, and also really grateful to you for reporting what doesn’t yet work and what your highest priorities are for quick fixes. In this post, we want to update you on what we’ve done and what we’re still working on.
Some of the biggest things we’ve been doing since the New Year are not immediately visible but are an essential part of eventually turning this into a supported product. The previous preview was built on a developer’s laptop from a private branch. Now all of the code is fully integrated into our main development branch. We’ve extended our CI suite to add several M1 machines, and we’ve extended our CI code to build and test Docker Desktop itself and all our dependencies for both architectures in parallel. With the whole pipeline now automated, from now on we will be able to issue new previews on a more regular basis and have more confidence that our changes have not broken anything.
As for feature changes and bug fixes since the last preview, here are some of the highlights:
- Kubernetes now works (although you might need to reset the cluster in our Troubleshoot menu one time to regenerate the certificates).
- The host.docker.internal and vm.docker.internal DNS entries now resolve.
- We removed hard-coded IP addresses: it now dynamically discovers the IP allocated by macOS.
- osxfs file sharing now works.
- We made a configuration change that should improve disk performance.
- The Restart option in the Docker menu works.
The last major thing that we’re still working on is:
- HTTP proxy support. At the moment the HTTP proxy configured on the host is ignored.
Finally, we are aware of the following items which are unfortunately out of our control. Here are our best recommendations for now:
- Some corporate security or VPN software blocks the connection between the host and the VM, or the VM and the outside world. This can happen even if it doesn’t happen on Intel Macs because we had to switch to a new connection method with Apple’s new virtualization framework. There are some possible workarounds posted by users on our github issue, https://github.com/docker/for-mac/issues/5208.
- If you are trying to run Intel-based containers on an M1 machine, they can sometimes crash. We are using a piece of software called qemu to emulate Intel chips on M1 but it occasionally fails to run the container. Where possible we recommend sticking to arm64 containers on M1 machines; they will also be faster.
If you have an M1 Mac, then we invite you to download this new build and try it out. (Just bear in mind that it’s still a preview, so expect some rough edges.) If you encounter any bugs, please let us know on our GitHub repo. If you filed a bug against the previous preview, now would be a good time to retest it and let us know either that it’s now fixed or that it isn’t. You can chat with other users on the #docker-desktop-mac channel on our community Slack. And finally, if you’re the sort of user who wants to be the first to try out early versions of our software (not just M1) we invite you to join our Developer Preview Program.
Docker For Mac Machine Ip Addresses
Tip submitted by @Akuka
Difference between Docker on Linux and Docker on Mac/Windows environments
Based on your OS, your DOCKER_HOST is different.On Linux, it will simply be your localhost.For Mac/Windows, you should obtain the appropriate IP using the following command:
Motivation
When you generate a new JHipster application, the host address of all the connections configurations (for example: database connection string) is localhost by default.This means that if you are using Docker to run services (such as a database / elastic search / SMTP server / etc…), you will need to edit your application configuration file and replace the database IP address from localhost to your DOCKER_HOST.
Port Forwarding
A Docker Machine is a virtual machine running under VirtualBox in your host machine.We can use the Port Forwarding feature of VirtualBox in order to access the Docker VM as localhost.
To achieve this do the following:
First of all, make sure your Docker Machine is stopped by executing the following:
Then:
- Open VirtualBox Manager
- Select your Docker Machine VirtualBox image (e.g.: default)
- Open Settings -> Network -> Advanced -> Port Forwarding
- Add your app name, the desired host port and your guest port
The following is a screenshot with a MySQL Port Forwarding example:
Now you’re ready to start your Docker Machine by executing the following:
Docker For Mac Machine Ip Address
Then just start your Docker container and you will be able to access it via localhost.