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DevOps | Docker
About Dockerfile and Image:
Dockerfile: A Dockerfile is a script that contains a series of commands that are used to create a Docker image.
Image: An image is a lightweight, stand-alone, and executable package that includes everything needed to run a piece of software, including code, runtime, libraries, environment variables, and config files.
In other words, a Dockerfile is a text file that specifies the instructions for building a Docker image. These instructions typically include a base image, any required dependencies or packages, commands to copy files into the image, and instructions on how to start the container that will run the application.
By using a Dockerfile, developers can automate the process of building Docker images and ensure that their applications run consistently in any environment that supports Docker.
Dockerfiles are an essential tool for building, deploying, and managing containerized applications.
Example of Dockerfile for a Nodejs application:
FROM node:12.2.0-alpine
WORKDIR app
COPY . .
RUN npm install
EXPOSE 8000
CMD ["node","app.js"]FROM: The Dockerfile must start with the FROM instruction, which specifies the base image that the new image will be built on top of.
RUN: The RUN instruction…
