kubeadm cluster on KVM with NGINX Ingress

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Modify any variables for environment

• vi group_vars/all

Install Prerequisites OS packages and pip modules for Ansible

• ./install_requirements.sh

Create ssh keypair for guest VMs

cd tf-libvirt
ssh-keygen -t rsa -b 4096 -f id_rsa -C tf-libvirt -N "" -q
cd ..

Create local KVM guest VM instances

• ansible-playbook playbook_terraform_kvm.yml

Deploy kubeadm

• ansible-playbook playbook_kubeadm_dependencies.yml
• ansible-playbook playbook_kubeadm_controlplane.yml
• ansible-playbook playbook_kubeadm_workers.yml

wait for all pods to be 'Running'

export KUBECONFIG=/tmp/kubeadm-kubeconfig
kubectl get pods -A

MetalLB with NGINX Ingress

• ansible-playbook playbook_metallb.yml
• ansible-playbook playbook_certs.yml
• ansible-playbook playbook_nginx_ingress.yml

wait for NGINX Ingress

# admission to be 'Completed', controller 'Running'
kubectl get pods -n ingress-nginx

# wait for non-empty IP address
kubectl get service -n ingress-nginx ingress-nginx-controller -o jsonpath="{.status.loadBalancer.ingress}"

Hello World deployment

• ansible-playbook playbook_deploy_myhello.yml

wait for deployment to be Ready 1/1

kubectl get deployment golang-hello-world-web -n default

Validate deployment at Ingress

• test myhello deployment exposed via NGINX Ingress

lb_ip=$(kubectl get service -n ingress-nginx ingress-nginx-controller -o jsonpath="{.status.loadBalancer.ingress[].ip}")

# test without needing DNS
curl -k --resolve kubeadm.local:443:${lb_ip} https://kubeadm.local:443/myhello/

# test by adding DNS to local hosts file
echo ${lb_ip} kubeadm.local | sudo tee -a /etc/hosts
curl -k https://kubeadm.local/myhello/