Install K3S on CentOS8

1 VM Setup

1.1 VM requirements

Just setup a CentOS8 minimal VM with the following requirements

• OS: centos8 minimal

• CPU: 2
• MEM: 8GB (6 GB may work as well)
• DISK: 40G (7GB used on a fresh setup)

1.2 Prepare OS

dnf -y upgrade
dnf -y install setroubleshoot-server curl lsof wget

sed -i  '/swap/d' /etc/fstab
swapoff -a

firewall-cmd --permanent --zone=public --add-service=https
firewall-cmd --zone=public --add-masquerade --permanent
firewall-cmd --reload
reboot

2 Setup K3S

curl -sfL https://get.k3s.io | sh

cat /etc/systemd/system/k3s.service
systemctl status k3s

kubectl get nodes
# all pods in running state? fine!
kubectl get pods --all-namespaces

3 DNS for Wildcard Ingress

• Create a CNAME

*.vm-name.domain.tld -> vm-name.domain.tld

4 Helm Install

curl https://raw.githubusercontent.com/helm/helm/master/scripts/get-helm-3 | sh
grep 'helm completion bash' $HOME/.bashrc || echo 'source <(helm completion bash)' >> $HOME/.bashrc