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Developing Kubernetes on Mac OS X

Kubernetes comes with a great script that lets you run an entire cluster locally using your current source code tree named hack/local-up-cluster.sh. However, it only runs on Linux, which means that if you're developing on your Mac you have to copy your source tree to a Linux machine to use the script (or switch to a Linux machine for development). Go in general, however, runs fine on Mac, so here is the flow that this Vagrant configuration aims to enable:

  • Edit source files on your Mac's checkout of Kubernetes and use go build (for syntax checking) and go test (for unit tests) directly on your Mac.
  • Run vagrant up (in this directory) to automatically:
  • Launch a Centos 7 VM on your Mac that has Go and Docker installed on the IP 10.1.2.3.
  • Mount your Mac's /Users directory into the VM at /Users to share your Mac's code with the VM.
  • Enable the ability to run a Kubernetes cluster using hack/local-up-cluster.sh.
  • Eliminate the need for docker-machine: Use Docker in the VM for building and releasing Kubernetes by forwarding Docker's port (2375) to localhost (this is done by default).

Getting started

You must have the following installed:

  • Virtualbox >= 5.1.22
  • Download and install from https://www.virtualbox.org/.
  • Vagrant >= 1.9.5
  • Download and install from https://www.vagrantup.com/.
  • vagrant-vbguest Vagrant plugin.
  • Install by running: vagrant plugin install vagrant-vbguest. We use the official CentOS 7 Vagrant box, which does not come with Virtualbox Guest Additions - installing this plugin ensures that the additions are installed on first vagrant up.
  • Go and a proper GOPATH on your Mac
  • See https://golang.org/doc/code.html for more information.

Next, install Kubernetes to your GOPATH by running go get k8s.io/kubernetes/.... If you want to write and contribute code, fork Kubernetes with your user on GitHub, and add your repo as a remote to your local checkout by running:

$ export GITHUB_USERNAME=<your github username>
$ cd $GOPATH/src/k8s.io/kubernetes
$ git remote add $GITHUB_USERNAME https://github.com/$GITHUB_USERNAME/kubernetes

Now you can push branches to your fork and issue pull requests against Kubernetes.

Once you have a Kubernetes checkout in your GOPATH:

  1. git clone this repo (it does not need to be in your GOPATH) and cd into it.
  2. Run vagrant up. That will start up the VM and bootstrap it with docker, go, and a mount of your Mac's /Users directory (amongst other things; see setup.sh for the complete bootstrapping process).
  3. Use vagrant ssh to SSH into the VM.
  4. cd into your Kubernetes directory (which should be at the same path as it is on your Mac).
  5. Enter hack/local-up-cluster.sh to start up a cluster using the code in your checkout.

The kubernetes apiserver is run on 10.1.2.3, not on 127.0.0.1, in order to enable access from your OS X host machine. If you want to use kubectl from your Mac, run export KUBERNETES_MASTER=10.1.2.3:8080 (the VM's environment is already preconfigured as such).

If you want to tweak the Vagrant config, copy config.sample.rb to config.rb and make any modifications you like.

Warnings

Running vagrant up MAY modify your Mac's GOPATH: go get github.com/tools/godep will be run in your GOPATH.

Sometimes the /Users NFS mount gets wedged and you get strange errors like Boffset: unknown state 0, Bseek: unknown state 0, or that the mount isn't working. If this happens just run vagrant reload which will shut down and restart the VM and should fix the mount errors.

If you ever have trouble compiling, try running make clean in the kubernetes source directory. It can solve many issues.

This configuration has only been explicitly tested on Mac OS X 10.9 and 10.10. It should work on other versions but no guarantees.