k3s-node

Add "cgroup_enable=cpuset cgroup_enable=memory cgroup_memory=1 swapaccount=1" to the end of /boot/firmware/cmdline.txt.

Install log2ram and rsync.

k3s Installation

To install the first server node run the following command:

curl -sfL https://get.k3s.io | INSTALL_K3S_VERSION=<K3S_VERSION> sh -s - server --cluster-init

To install further server nodes run:

curl -sfL https://get.k3s.io | INSTALL_K3S_VERSION=<K3S_VERSION> K3S_TOKEN=<K3S_TOKEN> sh -s server --server https://<SERVER_IP>:6443

The K3S_TOKEN can be found under /var/lib/rancher/k3s/server/node-token on the initial master node.

Agent nodes can be added by:

curl -sfL https://get.k3s.io | INSTALL_K3S_VERSION=<K3S_VERSION> K3S_URL=https://<SERVER_IP>:6443 K3S_TOKEN=<K3S_TOKEN> sh -

k3s Upgrade

k3s is upgraded to a specific version with:

curl -sfL https://get.k3s.io | INSTALL_K3S_VERSION=<K3S_VERSION> sh -s server

Longhorn

Disk to be used by Longhorn should be mounted to /var/lib/longhorn. Install dependencies required by Longhorn on each node:

apt-get install -y open-iscsi e2fsprogs xfsprogs lvm2

Rancher

Rancher can be installed or upgraded via following helm commands:

helm repo add rancher-stable https://releases.rancher.com/server-charts/stable
helm repo update
helm upgrade --install rancher rancher-stable/rancher --namespace cattle-system --set hostname=<HOSTNAME> --set bootstrapPassword=<SECRET> --set ingress.tls.source=letsEncrypt --set letsEncrypt.email=<EMAIL> --set letsEncrypt.ingress.class=traefik