Kubernetes Cluster

You can use Ansible to set up a kubernetes cluster.

Current kubernetes cluster is configured using ansible playbooks from https://github.com/cyverse-austria/ansible-k8s.git.

You can use this ansible playbook to setup your own kubernetes Cluster on Operating Systems such as: Centos7, Rocky Linux 8 and Debian 11.

Looking to setup your own k8s cluster?

If your are intrested to setup your own kubernetes cluster please follow the steps bellow.

Preq

Make sure you have at least 6 virtual machines configured with Centos7

• 1 Master node
• 4 worker nodes
• 1 worker node dedicated only for vice-apps

Make sure you have Ansible installed, and you can reach your virtual machines via ssh

Steps

Clone the repo

# clone repo
git clone https://github.com/cyverse-austria/ansible-k8s.git

# navigate to cloned repo
cd ansible-k8s

create your inventory

Create your inventory file under /inventory/MYINVENTORY and replace the host names as yours.

[k8s:children]
k8s-control-plane
k8s-worker

[kube-apiserver-haproxy]
k8-haproxy

[k8s-control-plane]
k8-c01
k8-c02

[k8s-storage:children]
k8s-worker

[k8s-worker:children]
vice-workers
k8s-workers

[k8s-workers]
k8-w01
k8-w02

[vice-workers]
k8-vice-w01

[outward-facing-proxy]
vice-haproxy-01

[haproxy]

[loadbalancer]
haproxy-01

Run playbooks

Note: we are using --user root --become, if your virtual machines have a diffrent user you could change this.

Check if your hosts are reachable

ansible -i /inventory/MYINVENTORY -m ping all --user root --become

Setup firewall configs

ansible-playbook -i /inventory/MYINVENTORY firewalld-config.yml --user root --become

Provision your nodes

ansible-playbook -i /inventory/MYINVENTORY provision-nodes.yml --user root --become

Init master/worker nodes

ansible-playbook -i /inventory/MYINVENTORY multi-master.yml --user root --become

Tainting and Labeling VICE Worker Nodes

kubectl label nodes k8-vice-w01 vice=true
kubectl taint nodes k8-vice-w01 vice=only:NoSchedule