Deployment

In this short demo, we will create a nginx container that server a index.html file. Once the container is correctly configured, it will be published on Docker Hub and in the last step it will be deploy on a K8s Cluster.

Step 1. Create container

Create a index.html file with “hello world” as content

Create the Dockerfile:

FROM nginx
COPY index.html /usr/share/nginx/html
EXPOSE 80
CMD ["nginx", "-g", "daemon off;"]

Build the new container:
```
docker build -t buntschu/mynginx:v1 .
```

Step 2. Test the new docker image

With docker installed on your machine, just run this command to start the container:
```
docker run -p 8080:80 mynginx
```
Open a browser and check the answer. Use the URL: http://localhost:8080

Step 3. Publish your new image to Docker Hub

Push the new image to Docker Hub (You need to create an account):
```
docker push buntschu/mynginx:v1
```

Step 4. Deploy it on minikube

Option 1

With kubectl and specifying parameters

Deployment:

kubectl create deploy myweb --image buntschu/mynginx:v1

Expose the deployment:

kubectl expose deploy myweb --type=NodePort --port 80 --name=myservice

Option 2

By creating deployment and service description in files.

Create a file simple-deploy.yaml (in YAML format):

apiVersion: apps/v1
kind: Deployment
metadata:
  name: web
  labels:
        app: mynginx
spec:
  replicas: 1
  selector:
    matchLabels:
      app: mynginx
  template:
    metadata:
      labels:
        app: mynginx
    spec:
      containers:
      - name: nginx
        image: buntschu/mynginx:v1
        ports:
        - containerPort: 80

Create a file simple-service.yaml:

apiVersion: v1
kind: Service
metadata:
  name: myservice
spec:
  type: NodePort
  selector:
    app: mynginx
  ports:
  - port: 80
    targetPort: 80

Deploy the whole:

kubectl apply -f simple-deploy.yaml -f simple-service

Step 5. Check

Check the deployment: ```bash kubectl get deploy kubectl get pods ````
Check the service:
```
kubectl get service
```
Get the service URL on minikube:
```
minikube  service myservice --url 
```

Step 6. Access your web

With the URL obtained in step 4
```
curl <url>
```
or with a browser

Dernière mise à jour: 3 October 2023