'''Issuing a Virtual IP to a Service Using MetalLB on Kubernetes'''

MetalLB is a load balancer implementation for bare metal Kubernetes clusters, using L2 advertisements. This tutorial will guide you through the process of setting up MetalLB in your Kubernetes cluster and assigning a virtual IP to a service.

'''Step 1: Install MetalLB'''

MetalLB can be installed via a manifest or using Helm. We'll use the manifest method here. 

'''1. Apply the MetalLB manifest:'''

{{{
kubectl apply -f
https://raw.githubusercontent.com/metallb/metallb/v0.13.12/con
fig/manifests/metallb-native.yaml
}}}

Note: Ensure you're using the latest version of MetalLB. 

'''2. Verify the Installation.'''

`kubectl get pods -n metallb-system`

You should see the MetalLB pods running.

'''Step 2: Configure MetalLB'''

MetalLB can operate in either Layer 2 mode or BGP mode. We'll use Layer 2 mode for simplicity.

1. Create a ConfigMap for MetalLB: Define a range of IP addresses that MetalLB will manage. Create a file named `metallb-pool.yaml` with the following content:

{{{
apiVersion: metallb.io/v1beta1
kind: IPAddressPool
metadata:
name: ippool
  namespace: metallb-system
spec:
  addresses:
  - 192.168.1.200/32
  - 192.168.1.240-192.168.1.250
}}}

Replace 192.168.1.240-192.168.1.250 with your desired IP range.

Apply the Pool:

`kubectl apply -f metallb-pool.yaml`

2. Create a L2 Advertisement: When additional IP ranges are defined in the config- map, they need to be advertised on to the network. Create a file named L2add.yaml with the following content:

{{{
apiVersion: metallb.io/v1beta1
kind: L2Advertisement
metadata:
  name: example
  namespace: metallb-system
spec:
  ipAddressPools:
  - ippool
}}}