Simple-Dockerized-Node-App 🚢

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Purpose

• Practise writing Dockerfiles.
• Build an image.
• Run a container.

Steps to create the image

• Create javescript file with the following content console.log("Hello world");.
• Create Dockerfile and specify the base image as node, NodeJs is the execution environment for JavaScript . FROM node:18.14.2-alpine3.17

Image	node:18.14.2-alpine3.17

• Change the working directory to the location where all the subsequent instructions in the Dockerfile will be run relatively. WORKDIR /usr/app
• Copy the app file index.js from host to the docker container. COPY index.js .
• Run the app once a container is created. CMD ["node","index.js"]

How to the use the Dockerfile on your machine to build an image

• Clone this repo
• Change the working directory to the cloned repo.
• On your terminal run docker build -t [chosen-image-name] .

. → indecates the current working directory, where the Dockerfile can be found.

• Now run docker images , and check for the created image.

How to run a container from the image, that you have created

docker run -it --rm --name [chosen-container-name] [chosen-image-name]

• to map ports use -p [host-port]:[container-port]
• to attach volume --mount source=[volume-name],target=[mount-point-in-container]

NOTE: Volume can be created through docker volume create [volume-name]