expressjsHow can I deploy an Express.js application on Kubernetes?
- Create a Dockerfile that builds a Docker image for your Express.js application.
FROM node:10
RUN mkdir -p /usr/src/app
WORKDIR /usr/src/app
COPY package*.json ./
RUN npm install
COPY . .
EXPOSE 3000
CMD ["npm", "start"]
- Build the Docker image and push it to a Docker registry.
docker build -t express-app .
docker tag express-app:latest <docker-registry>/express-app:latest
docker push <docker-registry>/express-app:latest
- Create a Kubernetes deployment manifest file.
apiVersion: apps/v1
kind: Deployment
metadata:
name: express-app
spec:
replicas: 1
selector:
matchLabels:
app: express-app
template:
metadata:
labels:
app: express-app
spec:
containers:
- name: express-app
image: <docker-registry>/express-app:latest
ports:
- containerPort: 3000
- Create a Kubernetes service manifest file.
apiVersion: v1
kind: Service
metadata:
name: express-app
spec:
type: NodePort
selector:
app: express-app
ports:
- protocol: TCP
port: 3000
targetPort: 3000
- Deploy the application to Kubernetes.
kubectl apply -f deployment.yaml
kubectl apply -f service.yaml
- Verify the deployment.
kubectl get pods
Output example
NAME READY STATUS RESTARTS AGE
express-app-7c8d7b6f9-x2lhb 1/1 Running 0 3m
- Access the application.
The application will be accessible at <node-ip>:<node-port>
.
Helpful links
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