[Metallb] Create LoadBalancer Service on K8S (on-premise) so easily

Hiện tại phiên bản v0.13.x có 1 breakchange, but cũng rất dễ dàng setup.

https://metallb.universe.tf/

kubectl apply -f https://raw.githubusercontent.com/metallb/metallb/v0.13.7/config/manifests/metallb-native.yaml

root@k8s-master:~# kubectl get ns
NAME              STATUS   AGE
argocd            Active   30m
cilium            Active   22h
default           Active   22h
k0s-autopilot     Active   22h
kube-node-lease   Active   22h
kube-public       Active   22h
kube-system       Active   22h
metallb-system    Active   14s
root@k8s-master:~# kubectl get all -n metallb-system

Đây là các config mẫu.
Bạn cần chọn ra 1 range IP cho loadbalancer.

root@k8s-master:~/metallb# cat IPAddressPool.yaml
apiVersion: metallb.io/v1beta1
kind: IPAddressPool
metadata:
  name: first-pool
  namespace: metallb-system
spec:
  addresses:
  - 192.168.101.220-192.168.101.240

root@k8s-master:~/metallb# kubectl -n metallb-system get ipaddresspools.metallb.io
NAME         AUTO ASSIGN   AVOID BUGGY IPS   ADDRESSES
first-pool   true          false             ["192.168.101.220-192.168.101.240"]

cat L2Advertisement.yaml
apiVersion: metallb.io/v1beta1
kind: L2Advertisement
metadata:
  name: example
  namespace: metallb-system
spec:
  ipAddressPools:
  - first-pool