K3s
Installation
Disable swap memory
comment swap.img in /etc/fstab
swapoff -a
sudo curl -sfL https://get.k3s.io | sh -
By default: service cidr: 10.43.0.0/16 and pod cidr: 10.42.0.0/16
to change it, add --cluster-cidr=10.0.0.0/16 --service-cidr=10.1.0.0/16 to above command
Join Master Node from agent node:
sudo cat /var/lib/rancher/k3s/server/node-token on your server: get NODE_TOKEN from master node
sudo k3s agent --server https://myserver:6443 --token ${NODE_TOKEN}
Installing and registering at the same time, all below commands have the same result
curl -sfL https://get.k3s.io | INSTALL_K3S_EXEC="agent --server https://k3s.example.com --token mypassword" sh -s -
curl -sfL https://get.k3s.io | INSTALL_K3S_EXEC="agent" K3S_TOKEN="mypassword" sh -s - --server https://k3s.example.com
curl -sfL https://get.k3s.io | K3S_URL=https://k3s.example.com sh -s - agent --token mypassword
curl -sfL https://get.k3s.io | K3S_URL=https://k3s.example.com K3S_TOKEN=mypassword sh -s - # agent is assumed because of K3S_URLVerification
systemctl status k3s.service
systemctl status k3s-agent.service
Uninstallation
Master Node: /usr/local/bin/k3s-uninstall.sh
Agent: /usr/local/bin/k3s-agent-uninstall.sh
Ingress-Controller
K3s uses Traefik as the default Ingress controller
Traefik Handles Ingress traffic using ports 80 and 443.
Uses ServiceLB to distribute traffic across nodes.
Can be customized via HelmChartConfig (/var/lib/rancher/k3s/server/manifests/traefik.yaml).
To disable traefik, start K3s with --disable=traefik
Troulbeshooting
Service is activiting
Solution: ensure minimum server requirement is met
Reference
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