Build a Kubernetes cluster using Vagrant, Ansible with kubeadm.

System requirements:

• Deployment environment must have Ansible 2.4.0+
• Master and nodes must have passwordless SSH access

Add the system information gathered above into a file called hosts.ini. For example:

[master]
10.10.10.11

[node]
10.10.10.[12:13]

[kube-cluster:children]
master
node

Before continuing, edit group_vars/all.yml to your specified configuration.

For example, I choose to run flannel instead of calico, and thus:

# Network implementation('flannel', 'calico')
network: flannel

Note: Depending on your setup, you may need to modify cni_opts to an available network interface. By default, kubeadm-ansible uses eth1. Your default interface may be eth0.

After going through the setup, run the site.yaml playbook:

$ ansible-playbook site.yaml

Download the admin.conf from the master node:

$ scp k8s@k8s-master:/etc/kubernetes/admin.conf .

Verify cluster is fully running using kubectl:

$ export KUBECONFIG=~/admin.conf
$ kubectl get node
NAME      STATUS    AGE       VERSION
k8s-master1   Ready     22m       v1.6.3
k8s-node1     Ready     20m       v1.6.3
k8s-node2     Ready     20m       v1.6.3

$ kubectl get po -n kube-system
NAME                                    READY     STATUS    RESTARTS   AGE
etcd-k8s-master1                            1/1       Running   0          23m
...

Finally, reset all kubeadm installed state using reset-site.yaml playbook:

$ ansible-playbook reset-site.yaml