A Dockerfile hija fajl ta' test b'istruzzjonijiet għall-binja ta' immaġini Docker — tiddeskrivi l-immaġini bażi, dipendenzji, fajls li għandek tikpja, u kif jiddaħħal l-applikazzjoni. Hija tagħmel il-binaż tal-immaġini ripetibili u kontrollati mill-verżjoni.
Dockerfile bażiku
# FROM — the base image to build on
FROM node:20-alpine
# WORKDIR — set the working directory inside the image
WORKDIR /app
# COPY dependency files first (for better layer caching)
COPY package*.json ./
# RUN — execute a command during the BUILD (install dependencies)
RUN npm install
# COPY the rest of the application code
COPY . .
# EXPOSE — document the port the app listens on
EXPOSE 3000
# CMD — the command to run when a CONTAINER starts
CMD ["node", "server.js"]
