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.
$ vagrant up
That's it.
It will create one Master VM and one Node VM by default.
$ vagrant ssh master
Welcome to Barge 2.13.0, Docker version 18.06.2-ce, build 6d37f41
[bargee@master ~]$ kubectl get nodes
NAME STATUS ROLES AGE VERSION
master Ready master 50s v1.15.0
node-01 Ready <none> 20s v1.15.0
[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'.
[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 11s
[bargee@master ~]$ kubectl get pods -o wide
NAME READY STATUS RESTARTS AGE IP NODE NOMINATED NODE READINESS GATES
sample-pod 1/1 Running 0 23s 10.244.1.2 node-01 <none> <none>
[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] 4600
[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 4600
[bargee@master ~]$ kubectl delete -f /vagrant/samples/sample-pod.yml
pod "sample-pod" deleted
[bargee@master ~]$ kubectl get pods
No resources found.
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 2.13.0, Docker version 17.03.2-ce, build f5ec1e2
[bargee@master ~]$ kubectl get nodes
NAME STATUS ROLES AGE VERSION
master Ready master 4m41s v1.15.0
node-01 Ready <none> 3m57s v1.15.0
node-02 Ready <none> 21s v1.15.0