Single node k8s cluster on CentOS 8

ONLY FOR DEV. PURPOSES

Features

• kubeadm
• cri-o
• calico
• selinux in enforcing mode

Prereqs.

• A CentOS machine/VM minimal install with SSH enabled
• Ansible installed on your machine
• Replace all references to 10.0.1.18 with your masters IP (doh)
• Helm for Traefik deployment

Installation

1. Run playbooks in order (edit hosts file with your IP)
2. SSH to node and run "kubeadm init --pod-network-cidr=192.168.0.0/16"
3. Follow instructions to set up kubectl config
4. Deploy pod network "kubectl apply -f https://docs.projectcalico.org/manifests/calico.yaml"
5. Remove taint from master to allow scheduling of pods, "kubectl taint nodes --all node-role.kubernetes.io/master-"
6. Optionally copy the kubeconfig file to your machine (scp [email protected]:~/.kube/config ~/.kube/config)

Deploy Traefik & sample application

1. Edit script helm_deploy_traefik.sh with your IP
2. Run script helm_deploy_traefik.sh in sample_app/ dir
3. Edit ingress part of sample_app.yaml with host name of choice
4. Apply the sample app, "kubectl apply -f sample_app/sample_app.yaml"
5. Test app with "curl -H "Host: sample-app.localdomain" 10.0.1.18" or add sample-app.localdomain to your /etc/hosts file or local DNS server