vagrant-kubernetes-lab

This project is to provide a simple local Kubernetes cluster with a master and a worker node for testing purpose.

Vagrant was chosen for being able to create the cluster either on linux, windows and mac hosts.

Prequirements

• Vagrant : https://www.vagrantup.com/downloads.html
• VirtualBox : https://www.virtualbox.org/wiki/Downloads

Default provisioning

Vagrant up will provide 2 Ubuntu Xenial VMs for a kubernetes cluster with these features by default :

• Kubernetes control plane (latest)
• Weave network cni (latest)
• Kubernetes Dashboard (latest)
• Heapster v1.5.1
• Helm (latest)

Options

network

By default, we will use the Weave-Net driver but you can override it with flannel like this:

 vagrant --network=flannel up

mount

It is possible to mount a directory from the host to the /data directory on each node. This option could be used, for example, to make git repositories local to the host available to be used in the cluster.

The --mount=<pathOnHost> option allows to choose the directory on the host that will be mounted to /data. If that option is not specified, nothing will be mounted.
For example, run the command:

 vagrant --mount=/home/user/git up

dockerhub login

You can provide your username and password in order to do a "docker login" on each node of the cluster. This will allow you to pull private images from the Docker registry.

 vagrant --docker-username=myUser --docker-password=myPassword up

Kubeconfig

After installation, a copy of the admin.conf generated by kubeadm is available on the host in the /vagrant/kubeconfig directory, which is a shared folder inside the Git repo ./kubeconfig

Even if kubectl can be used within the guests, it is suggested that you copy the admin.conf as config in your ~/.kube/ directory on the host to able to do kubectl proxy and kubectl port-forward per example.

Or you can simply execute:

export KUBECONFIG=`pwd`/kubeconfig/admin.conf
kubectl get nodes

And you should see:

NAME        STATUS    ROLES     AGE       VERSION
k8smaster   Ready     master    10m       v1.9.0
k8sworker   Ready     <none>    5m        v1.9.0

Extra features

Multiple optionnal extra softwares has been tested with this cluster and are available if needed.

Here is the current list by category :

Ingress

• Nginx ingress controller v0.9.0-beta.15 + Default backend v1.4

  Monitoring

• InfluxDB v1.3.3 + Grafana v4.4.3
• Weavescope v1.6.7

  Networking

• Weave net (latest)
• Flannel v0.9.1

  Storage

• Nfs-provisioner v1.0.9

  Helm

• Helm (latest) Installed by default, only helm client is required to fit your host OS : https://github.com/kubernetes/helm/releases

  Have a look at the README.md in related subdirectories for specific instructions.

Install everything (Quick start)

Note that if you want to install everything, you can simply run the following script (providing you have kubectl installed):

vagrant up
bash scripts/install-all-features.sh
kubectl get pods --all-namespaces -o wide

And repeat the get "kubectl get pods" command as long as the pods are not up and running.

Open dashboards

Kubernetes

Follow the instructions printed in the console:

bash scripts/open-dashboard.sh

Grafana

Note that you might have to reload the page in your browser.

bash scripts/open-grafana.sh

Weave Scope

Note that you might have to reload the page in your browser.

bash scripts/open-weavescope.sh