03. [30p] Writing a Dockerfile
Subtasks
- go to the node_app folder from the lab archive, which contains the source files for a simple NodeJS application
- write a Dockerfile that will be used to create an image by following the steps below:
- start from the latest version of the official NodeJS image, node:21-alpine3.18
- copy the file package.json from the local host to the current directory in the new image (./); this file is intended to specify the dependencies of the NodeJS application (for example, the Express.js framework)
- run the command npm install to install the dependencies in the file from the previous step
- copy the source file server.js to the working directory /usr/src/app/
- expose port 8080
- set the command to run the application; you will run the node binary to execute the /usr/src/app/server.js file
- use the previously written Dockerfile to create an image called mynodeimage
- start a container running image mynodeimage on port 12345 in detached (daemon) mode
- verify that your application works correctly by going to http://localhost:12345 (you should see a “Hello World” text)
