3-node-web-app

Node Web App with Dockerfile

In this lesson, we are going to be looking at how to do following list of tasks:

1. Create very basic Node JS express Web App in TypeScript.
2. Build custom image of our application.
3. Run newly built web app image in a container.
4. Access the web app from our host machine.

How to run 💻

1. Create Docker image.

   • $ docker build -t <your_name>/simpleweb .

2. Run Docker image.

   • $ docker run -p 8080:8080 <your_name>/simpleweb:latest

3. Access Web server.

   • http://localhost:8080.

4. You can access directory structure for debugging purpose.

   • $ docker run -it shawnkoon/simpleweb:latest sh

5. If you know the container id, you can attach into running container.

   • $ docker exec -it <CONTAINER ID/NAMES> sh

Key Takeaways 🎯

• Order of Dockerfile instructions matter.
• Developer can reduce unnecessary cache busting and re-installing dependencies by separating COPY commands.
• You have to map ports in order to access port in container application.
• WORKDIR command will set pwd on ANY subsequent container commands. (Even attaching into container).