Install K3S on Fedora CoreOS

In this post I will show you how you can Install K3S on Fedora CoreOS(FCOS) in virtualization environment.

Parts of the K3S series

• Part1a: Install K3S with k3sup and kube-vip
• Part1b: Install K3S with CRI-O
• Part1c: Install K3S on Fedora CoreOS
• Part2b: Install K3S with k3sup and Calico
• Part2c: Install K3S with k3sup and Cilium
• Part3: K3S helm CR
• Part5: Secure k3s with gVisor
• Part6: Kubernetes Certificate Rotation

What is K3S

K3S is a lightweight certified kubernetes distribution. Designed to be a single binary of less than 40MB. It didn’t use etcd instad stora it’s data in sqlite.

Install requirements

sudo -i
rpm-ostree install https://rpm.rancher.io/k3s-selinux-0.1.1-rc1.el7.noarch.rpm
systemctl reboot

Install K3S

sudo -i
export K3S_KUBECONFIG_MODE="644"
export INSTALL_K3S_EXEC=" --no-deploy servicelb --no-deploy traefik"

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

systemctl status k3s
kubectl get nodes -o wide
kubectl get pods -A -o wide

Join other nodes

First we need the join token:

sudo cat /var/lib/rancher/k3s/server/node-token
K1042e2f8e353b9409472c1e0cca8457abe184dc7be3f0805109e92c50c193ceb42::node:c83acbf89a7de7026d6f6928dc270028

The join the worker nodes:

export K3S_KUBECONFIG_MODE="644"
export K3S_URL="https://k3s-master:6443"
export K3S_TOKEN="K1042e2f8e353b9409472c1e0cca8457abe184dc7be3f0805109e92c50c193ceb42::node:c83acbf89a7de7026d6f6928dc270028"

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