Installing MetalLB Load Balancer for Kubernetes Bare Metal VMs Clusterv Version-0.14.8

[root@master metallb]# kubectl get nodes
NAME                  STATUS   ROLES           AGE   VERSION
master.example.com    Ready    control-plane   10d   v1.31.2
worker1.example.com   Ready    <none>          10d   v1.31.2
worker2.example.com   Ready    <none>          10d   v1.31.2
worker3.example.com   Ready    <none>          10d   v1.31.2
[root@master metallb]#

# see what changes would be made, returns nonzero returncode if different
kubectl get configmap kube-proxy -n kube-system -o yaml | \
sed -e "s/strictARP: false/strictARP: true/" | \
kubectl diff -f - -n kube-system

# actually apply the changes, returns nonzero returncode on errors only
kubectl get configmap kube-proxy -n kube-system -o yaml | \
sed -e "s/strictARP: false/strictARP: true/" | \
kubectl apply -f - -n kube-system


Step1://- Check the Enable strict ARP mode ||  --->strictARP: true
kubectl edit configmap -n kube-system kube-proxy

 ipvs:
      excludeCIDRs: null
      minSyncPeriod: 0s
      scheduler: ""
      strictARP: true
      syncPeriod: 0s
      tcpFinTimeout: 0s
      tcpTimeout: 0s
      udpTimeout: 0s

Step2:// Installation by manifest
[root@master metallb]# kubectl apply -f https://raw.githubusercontent.com/metallb/metallb/v0.14.8/config/manifests/metallb-native.yaml
namespace/metallb-system created
customresourcedefinition.apiextensions.k8s.io/bfdprofiles.metallb.io created
customresourcedefinition.apiextensions.k8s.io/bgpadvertisements.metallb.io created
customresourcedefinition.apiextensions.k8s.io/bgppeers.metallb.io created
customresourcedefinition.apiextensions.k8s.io/communities.metallb.io created
customresourcedefinition.apiextensions.k8s.io/ipaddresspools.metallb.io created
customresourcedefinition.apiextensions.k8s.io/l2advertisements.metallb.io created
customresourcedefinition.apiextensions.k8s.io/servicel2statuses.metallb.io created
serviceaccount/controller created
serviceaccount/speaker created
role.rbac.authorization.k8s.io/controller created
role.rbac.authorization.k8s.io/pod-lister created
clusterrole.rbac.authorization.k8s.io/metallb-system:controller created
clusterrole.rbac.authorization.k8s.io/metallb-system:speaker created
rolebinding.rbac.authorization.k8s.io/controller created
rolebinding.rbac.authorization.k8s.io/pod-lister created
clusterrolebinding.rbac.authorization.k8s.io/metallb-system:controller created
clusterrolebinding.rbac.authorization.k8s.io/metallb-system:speaker created
configmap/metallb-excludel2 created
secret/metallb-webhook-cert created
service/metallb-webhook-service created
deployment.apps/controller created
daemonset.apps/speaker created
validatingwebhookconfiguration.admissionregistration.k8s.io/metallb-webhook-configuration created

Step://3 Layer 2 Configuration for to advertise the IP Pool
[root@master metallb]# kubectl create -f metallb-ipadd-pool.yaml
ipaddresspool.metallb.io/first-pool created

[root@master metallb]# cat metallb-ipadd-pool.yaml
apiVersion: metallb.io/v1beta1
kind: IPAddressPool
metadata:
  name: first-pool
  namespace: metallb-system
spec:
  addresses:
  - 192.168.29.240-192.168.29.250
[root@master metallb]#

Steps 4:// Advertise the IP Address Pool
[root@master metallb]# kubectl apply -f metallb-pool-advertise.yaml
l2advertisement.metallb.io/example created

[root@master metallb]# cat metallb-pool-advertise.yaml
apiVersion: metallb.io/v1beta1
kind: L2Advertisement
metadata:
  name: example
  namespace: metallb-system
spec:
  ipAddressPools:
  - first-pool
[root@master metallb]#

Step:5:// Last check the loadBalancer 
[root@master metallb]# kubectl create deployment nginx-web-server --image=nginx
deployment.apps/nginx-web-server created
[root@master metallb]# kubectl expose deployment nginx-web-server --port=80 --target-port=80 --type=LoadBalancer
service/nginx-web-server exposed
[root@master metallb]# kubectl get svc
NAME               TYPE           CLUSTER-IP       EXTERNAL-IP      PORT(S)        AGE
kubernetes         ClusterIP      10.96.0.1        <none>           443/TCP        10d
nginx              LoadBalancer   10.109.254.115   192.168.29.240   80:30937/TCP   3h3m
nginx-web-server   LoadBalancer   10.102.230.193   192.168.29.241   80:30490/TCP   11m

        

[root@master metallb]# curl 192.168.29.240
<!DOCTYPE html>
<html>
<head>
<title>Welcome to nginx!</title>
<style>
html { color-scheme: light dark; }
body { width: 35em; margin: 0 auto;
font-family: Tahoma, Verdana, Arial, sans-serif; }
</style>
</head>
<body>
<h1>Welcome to nginx!</h1>
<p>If you see this page, the nginx web server is successfully installed and
working. Further configuration is required.</p>

<p>For online documentation and support please refer to
<a >nginx.org</a>.<br/>
Commercial support is available at
<a >nginx.com</a>.</p>

<p><em>Thank you for using nginx.</em></p>
</body>
</html>
[root@master metallb]#