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Kubernetes Cluster on Barge with Vagrant
Kubernetes is an open-source system for automating deployment, scaling, and management of containerized applications.
It groups containers that make up an application into logical units for easy management and discovery. Kubernetes builds upon 15 years of experience of running production workloads at Google, combined with best-of-breed ideas and practices from the community.
This repo creates a Kubernetes cluster on Barge with Vagrant locally and instantly.
Requirements
Boot up
$ vagrant up
That's it.
It will create one Master VM and one Node VM by default.
$ vagrant ssh master
Welcome to Barge 2.9.0, Docker version 17.03.2-ce, build f5ec1e2
[bargee@master ~]$ kubectl get nodes
NAME STATUS ROLES AGE VERSION
master Ready master 2m v1.10.3
node-01 Ready <none> 31s v1.10.3
[bargee@master ~]$ kubectl cluster-info
Kubernetes master is running at https://192.168.65.100:6443
KubeDNS is running at https://192.168.65.100:6443/api/v1/namespaces/kube-system/services/kube-dns:dns/proxy
To further debug and diagnose cluster problems, use 'kubectl cluster-info dump'.
Create a Sample Pod
[bargee@master ~]$ kubectl create -f /vagrant/samples/sample-pod.yml
pod "sample-pod" created
[bargee@master ~]$ kubectl get pods
NAME READY STATUS RESTARTS AGE
sample-pod 1/1 Running 0 18s
[bargee@master ~]$ kubectl get pods -o wide
NAME READY STATUS RESTARTS AGE IP NODE
sample-pod 1/1 Running 0 49s 10.244.1.2 node-01
[bargee@master ~]$ kubectl logs sample-pod
[bargee@master ~]$ kubectl exec -it sample-pod bash
root@sample-pod:/# ls
bin boot dev etc home lib lib64 media mnt opt proc root run sbin srv sys tmp usr var
root@sample-pod:/# exit
exit
[bargee@master ~]$ kubectl port-forward sample-pod 8888:80 >/dev/null 2>&1 &
[1] 29425
[bargee@master ~]$ wget -qO- http://localhost:8888
<!DOCTYPE html>
<html>
<head>
<title>Welcome to nginx!</title>
<style>
body {
width: 35em;
margin: 0 auto;
font-family: Tahoma, Verdana, Arial, sans-serif;
}
</style>
</head>
<body>
<h1>Welcome to nginx!</h1>
<p>If you see this page, the nginx web server is successfully installed and
working. Further configuration is required.</p>
<p>For online documentation and support please refer to
<a href="http://nginx.org/">nginx.org</a>.<br/>
Commercial support is available at
<a href="http://nginx.com/">nginx.com</a>.</p>
<p><em>Thank you for using nginx.</em></p>
</body>
</html>
[bargee@master ~]$ kill 29425
[bargee@master ~]$ kubectl delete -f /vagrant/samples/sample-pod.yml
pod "sample-pod" deleted
[bargee@master ~]$ kubectl get pods
No resources found.
Scale Up
You can add more Nodes to modify the following line in the Vagrantfile.
NUM_OF_NODES = 2and execute vagrant up node-<n> to boot up an additional node.
$ vagrant up node-02
$ vagrant ssh master
Welcome to Barge 2.9.0, Docker version 17.03.2-ce, build f5ec1e2
[bargee@master ~]$ kubectl get nodes
NAME STATUS ROLES AGE VERSION
master Ready master 5m v1.10.3
node-01 Ready <none> 3m v1.10.3
node-02 Ready <none> 31s v1.10.3