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Containerize App

topics/devops/solutions/containerize_app.md

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Containerize an Application

  1. Clone an open source project you would like to containerize. A couple of suggestions:
https://github.com/bregman-arie/node-hello-world
https://github.com/bregman-arie/flask-hello-world

git clone https://github.com/bregman-arie/node-hello-world

  1. Write a Dockerfile you'll use for building an image of the application (you can use any base image you would like)
FROM alpine
LABEL maintainer="your name/email"
RUN apk add --update nodejs npm
COPY . /src
WORKDIR /src
RUN npm install
EXPOSE 3000
ENTRYPOINT ["node", "./app.js"]
  1. Build an image using the Dockerfile you've just wrote

docker image build -t web_app:latest .

  1. Verify the image exists

docker image ls

  1. [Optional] Push the image you've just built to a registry
docker login
docker image tag web_app:latest <your username>/web_app:latest
# Verify with "docker image ls"
docker image push <your username>/web_app:latest
  1. Run the application
docker container run -d -p 80:3000 web_app:latest
  1. Verify the app is running
docker container ls
docker logs <container ID/name>
# In the browser, go to 127.0.0.1:80