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syedimran
Explorer
456

Introduction

In this blog post, I will walk you through how I deployed an SAP CAP (Cloud Application Programming) project on SAP BTP using Docker instead of the traditional Node.js runtime. This approach provides better containerization, scalability, and easier environment management.

Why Use Docker for SAP CAP?

Traditionally, SAP CAP services are deployed directly using Node.js. However, by using Docker, we gain several advantages:

  • Portability: The application runs consistently across different environments.

  • Isolation: Dependencies are encapsulated within the container.

  • Scalability: Easily deploy multiple instances.

  • Ease of Deployment: A containerized approach makes it easier to move between cloud environments.

Dockerfile Configuration

To containerize the CAP service, I created a Dockerfile:

 

# Base image
FROM node:20.18.0

# Set working directory
WORKDIR /app

# Copy package.json and package-lock.json to install dependencies
COPY gen/srv/package.json gen/srv/package-lock.json ./

# Install dependencies
RUN npm ci
COPY gen/srv /app

# Set environment variable for production
ENV NODE_ENV=production

# Expose the port your app runs on (adjust if necessary)
EXPOSE 4004

# Start the application
CMD ["npx", "cds", "serve"]

 

MTA File : Make sure the type is 'application'

syedimran_0-1738687961827.png

Building and Deploying

Step 1: Build and Push Docker Image

First, build and push the image to a Docker registry:

 

docker build -t <your-docker-image>:latest .
docker push <your-docker-image>:latest

 

Step 2: Deploy the MTA Project

Using SAP's MTA deployment process:

 

 

mbt build
cf deploy <generated-mtar>.mtar

 

Build pack here is not nodejs 

syedimran_1-1738688280956.png

 

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