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Install K3s


If you haven't installed K3s yet, you can install it by running the following command:


curl -sfL https://get.k3s.io | sh -

You can verify the K3s installation by checking the node status:

kubectl get nodes

Install MetalLB

a. Create a Namespace for MetalLB

It’s a good practice to create a separate namespace for MetalLB:

kubectl create namespace metallb-system

b. Apply the MetalLB Manifest

Run the following command to deploy MetalLB using its official manifest:


kubectl apply -f https://raw.githubusercontent.com/metallb/metallb/v0.14.8/config/manifests/metallb-native.yaml

Make sure to check for the latest version of MetalLB on the MetalLB GitHub Releases page.

c. Check MetalLB Pods

Verify that the MetalLB components are running:

kubectl get pods -n metallb-system

You should see controller and speaker pods running.

Configure MetalLB

MetalLB needs a configuration to specify which IP address range to use for load balancing. You can create a ConfigMap with the configuration.

a. Define the IP Address Range

Create a YAML file named metallb-config.yaml with the following content, adjusting the ipAddressPool to match your network setup. For example:

Create MetalLB configuration
apiVersion: v1
kind: ConfigMap
metadata:
  namespace: metallb-system
  name: config
data:
  config: |
    layer2:
      addresses:
 	  - 192.168.114.101-192.168.114.101 # machine where K3S is installed 
      - 192.168.114.200-192.168.114.210


Make sure the IP range specified is within your local network range and does not conflict with existing devices.

b. Apply the ConfigMap

Apply the configuration:


kubectl apply -f metallb-config.yaml

c. Advertise choosen addresses


Create a YAML file named metallb-advertise.yaml :

Create MetalLB Advertisement
apiVersion: metallb.io/v1beta1
kind: L2Advertisement
metadata:
  name: example
  namespace: metallb-system
spec:
  ipAddressPools:
  - first-pool


kubectl apply -f metallb-advertise.yaml

d. Check ingress (traefik) gets loadbalancer address of the machine

kubectl get services -A






Install ArgoCD

Before installing ArgoCD, create a namespace where ArgoCD resources will live:


kubectl create namespace argocd

Install ArgoCD Using the Official Manifests

ArgoCD is installed by applying a YAML manifest. The official manifest deploys all necessary ArgoCD components, such as the API server, controller, and UI.

Run the following command to install ArgoCD:


kubectl apply -n argocd -f https://raw.githubusercontent.com/argoproj/argo-cd/stable/manifests/install.yaml

This command will install ArgoCD into the argocd namespace.

Check the ArgoCD Pods

After applying the manifest, you can check if the ArgoCD pods are running:

kubectl get pods -n argocd

You should see several pods, including argocd-server, argocd-repo-server, argocd-application-controller, and others.

Wait for everything ready.


Expose the ArgoCD Server

By default, the ArgoCD API server is only accessible inside the cluster. To access it externally, you can expose it using either a NodePort or LoadBalancer service. For a minimal installation like K3s, NodePort is typically used.

a. Expose ArgoCD with a NodePort:

Run this command to patch the argocd-server service to be of type NodePort:


kubectl patch svc argocd-server -n argocd -p '{"spec": {"type": "NodePort"}}'

To retrieve the NodePort, run the following command:


kubectl get svc -n argocd argocd-server

Look for the NodePort value under the PORT(S) column. You can now access the ArgoCD web UI at

http://<Node_IP>:<NodePort>.

https://<Node_IP>:<NodePort>


Node_IP = address/dns of the machine where is installed k3s


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