Easy peasy Failover/VIP solution for bare-metal k3s HA clusters - More info: https://github.com/janeczku/keepalived-ingress-vip

01-keepalived-vip.yaml

# Simply drop this file in `/var/lib/rancher/k3s/server/manifests/` on a k3s node
# Requires multicast capable network (won't work in cloud)
apiVersion: helm.cattle.io/v1
kind: HelmChart
metadata:
  name: keepalived-vip
  namespace: kube-system
spec:
  chart: keepalived-ingress-vip
  version: v0.1.6
  repo: https://janeczku.github.io/helm-charts/
  targetNamespace: kube-system
  valuesContent: |-
    keepalived:
      vrrpInterfaceName: eth0
      vipInterfaceName: eth0
      vipAddressCidr: "10.173.20.10/24"
      checkServiceUrl: https://127.0.0.1:6443/healthz
      checkKubelet: false
      checkKubeApi: false
    kind: Daemonset
    pod:
      nodeSelector:
        node-role.kubernetes.io/master: "true"

02-diagramm.yaml

```
                        Client
                          +
                          |
                          |
                          v
                    +-----+------+
         +------------Virtual IP-----------+
         |           10.173.20.10          |
         |                                 |
         |                                 |
                                           |
+-----------------+              +---------v-------+
|eth0 10.173.20.2 |              |eth0 10.173.20.3 |
|                 |              |                 |
|  +-----------+  |     VRRP     |  +------------+ |
|  |  Kube API |  | <----------> |  |  Kube API  | |
|  |           |  |              |  |            | |
|  +-----------+  |              |  +------------+ |
| K3s Master Node |              | K3s Master Node |
+-----------------+              +-----------------+
```