Kubeadm Ansible Playbook
Build a Kubernetes cluster using Ansible with kubeadm. The goal is easily install a Kubernetes cluster on machines running:
- Ubuntu 16.04
- CentOS 7
- Debian 9
System requirements:
- Deployment environment must have Ansible
2.4.0+ - Master and nodes must have passwordless SSH access
Usage
Add the system information gathered above into a file called hosts.ini. For example:
[master]
192.16.35.12
[node]
192.16.35.[10:11]
[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: flannelNote: 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
...
==> master1: TASK [addon : Create Kubernetes dashboard deployment] **************************
==> master1: changed: [192.16.35.12 -> 192.16.35.12]
==> master1:
==> master1: PLAY RECAP *********************************************************************
==> master1: 192.16.35.10 : ok=18 changed=14 unreachable=0 failed=0
==> master1: 192.16.35.11 : ok=18 changed=14 unreachable=0 failed=0
==> master1: 192.16.35.12 : ok=34 changed=29 unreachable=0 failed=0Download 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
master1 Ready 22m v1.6.3
node1 Ready 20m v1.6.3
node2 Ready 20m v1.6.3
$ kubectl get po -n kube-system
NAME READY STATUS RESTARTS AGE
etcd-master1 1/1 Running 0 23m
...Resetting the environment
Finally, reset all kubeadm installed state using reset-site.yaml playbook:
$ ansible-playbook reset-site.yaml