Nginx Deployment using Manifests

1. Deployment of Nginx using Manifests (YAML files)

sudo su -

cd /root/k3s/k3s-manifests/nginx

We are going to deploy the Nginx webserver in K3S Kubernetes Cluster

Before we can deploy Nginx we need to create a Namespace

A Namespace is a mechanism for isolating the deployment on one application in a Kubernetes Cluster from another application

1.1 create Namespace nico-nginx

kubectl get namespaces
kubectl create namespace nico-nginx
kubectl get namespaces

1.2 Create deployment manifest file: nginx-deployment.yml

nano nginx-deployment.yml

Put this into the file:

apiVersion: apps/v1
kind: Deployment
metadata:
  name: nginx-deployment
spec:
  selector:
    matchLabels:
      app: nginx
  replicas: 4
  template:
    metadata:
      labels:
        app: nginx
    spec:
      containers:
      - name: nginx
        image: nginx:1.14.2
        ports:
        - containerPort: 80

Apply the Deployment Manifest file nginx-deployment.yml

kubectl apply -f nginx-deployment.yml --namespace nico-nginx

kubectl get pods --namespace nico-nginx
kubectl get pods -o wide -n nico-nginx

---

1.3 Create service manifest file : nginx-service.yml

nano nginx-service.yml

Put this into the file:

apiVersion: v1
kind: Service
metadata:
  name: nginx
  labels:
    run: nginx
spec:
  ports:
    - port: 80
  selector:
    app: nginx

Apply the Service Manifest file nginx-service.yml

kubectl apply -f nginx-service.yml -n nico-nginx

kubectl get service -n nico-nginx
kubectl get endpoints -n nico-nginx

Open internally in cluster one endpoint

curl <endpointIP>:80
curl 10.42.0.82:80 // specify your own url

---

1.4 create service exposing manifest file : service-exposed.yaml

nano service-exposed.yaml

Put this into the file

apiVersion: networking.k8s.io/v1
kind: Ingress
metadata:
  name: nginx
  annotations:
    ingress.kubernetes.io/ssl-redirect: "false"
spec:
  rules:
  - http:
      paths:
      - path: /
        pathType: Prefix
        backend:
          service:
            name: nginx
            port:
              number: 80

Apply the Service Exposing Manifest file service-exposed.yaml

Run this command

kubectl apply -f service-exposed.yaml --namespace nico-nginx

Now check is service is exposed run this command

curl localhost:80

1.8 Open in browser:

Now open nginx in your browser

Using IP Addresses
http://10.154.2.89
http://10.154.2.93
http://10.154.2.95
http://10.154.2.97

Using FQDNs (Fully Qualified Domain Names)
http://upupa.loseyourip.com/]
http://kudu.loseyourip.com/
http://lion.loseyourip.com/
http://leopard.loseyourip.com/

1.9 The cleanup

Run these commands

kubectl delete namespace nico-nginx

kubectl get namespaces
kubectl get pods --all-namespaces

Bibliography

How to deploy NGINX Ingress Controller on Kubernetes using kubectl
Deploy a simple nginx app with Kubernetes on Google Cloud Platform (GCP)