Linux Containers

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Dockerfiles

Dockerfiles. How to make an image ?

A Dockerfile is a script used to build a Docker image. It contains a set of instructions that Docker uses to automatically create a containerized environment for a specific application. Docker images are a lightweight, standalone, and executable package that includes everything needed to run an application, including the code, runtime, libraries, and system tools.

How do Dockerfiles work ?

Example 1:

FROM eclipse-temurin:17-jdk-jammy

WORKDIR /app

COPY .mvn/ .mvn
COPY mvnw pom.xml ./
RUN ./mvnw dependency:resolve

COPY src ./src

CMD ["./mvnw", "spring-boot:run"]

Example 2:

FROM node:10-alpine

RUN mkdir -p /home/node/app/node_modules && chown -R node:node /home/node/app
WORKDIR /home/node/app

COPY package*.json ./
USER node

RUN npm install
COPY --chown=node:node . .

EXPOSE 8080
CMD [ "node", "app.js" ]

Assignment

Build a php Dockerfile for our info.php file.

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