simple-hello-world

Repo contains a simple hello world application that is written in node.js.

The directory structure is: . ├── CHANGELOG.md ├── Dockerfile ├── Jenkinsfile ├── Makefile ├── README.md ├── directory-structure.md ├── htmlfiles │   └── helloworld.html ├── k8syaml │   ├── deploymentService.yaml │   ├── ingress.yaml │   └── serviceAccount.yaml ├── package.json └── server.js

The server starts on port 8000.

Assumptions

This guide assumes that you have docker installed locally. Note: other containerisation applications are available, e.g. rancher-desktop

Docker build

To build the application:

docker build -f ./Dockerfile -t hello-world-app:1.0.0 . --no-cache

Note: this should be parameterised from GitHub for semantic versioning

Docker Run

To run using docker

docker run -p 8000:8000 hello-world-app:1.0.0

Perform manifest validation

kubeval can be used to validate the yaml files

kubeval ./k8syaml/deploymentService.yaml
kubeval ./k8syaml/serviceAccount.yaml
kubeval ./k8syaml/ingress.yaml

Perform static analysis of yaml

kube-score gives a list of recommendations of how it can be im proved

kube-score score ./k8syaml/deploymentService.yaml
kube-score score ./k8syaml/serviceAccount.yaml
kube-score score ./k8syaml/ingress.yaml

Deploy:

kubectl apply -f ./k8syaml/serviceAccount
kubectl apply -f ./k8syaml/deploymentService.yaml

###Access:

curl -vv http://localhost:30000

Note: if you change the service, removing the lines below

    nodePort: 30000
  type: NodePort

then you can use port-forward to connect e.g.

kubectl port-forward -n ns-simple-hw services/simple-hw-service 8000:8000