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Adding Metadata and Labels

For the last six months, the Acme Anvil Corporation has been migrating some of their bare-metal infrastructure to Docker containers. After the initial implementation, you mention to the team that labels can be used for storing metadata about images and containers. This is useful for keeping track of image and container attributes like the build date and application version. Your team thinks this is a great idea, and you’ve been tasked with creating a quick demo to show how useful labels can be. You created a small weather app a few months ago while learning Node.js, and it’s perfect for a quick demo. On your Docker workstation, you will create a Dockerfile that contains four labels: the maintainer, build date, application name, and application version. You will then build the image and push it to Docker Hub. On your Docker server, you will create a new container using the `weather-app` image. Once the container is running, you will update the branch of your application, rebuild the image, and push the changes to Docker Hub. On the Docker server, Watchtower will update the running container with the new version of the image.

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Path Info

Clock icon Intermediate
Clock icon 1h 0m
Clock icon Nov 07, 2018

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Table of Contents

  1. Challenge

    Create a Dockerfile

    Create a Dockerfile using the following instructions:

    FROM node
    LABEL maintainer="EMAIL_ADDRESS"
    LABEL org.label-schema.application=$APPLICATION_NAME
    LABEL org.label-schema.version=$BUILD_VERSION
    RUN mkdir -p /var/node
    ADD weather-app/ /var/node/
    WORKDIR /var/node
    RUN npm install
    EXPOSE 3000
    CMD ./bin/www
  2. Challenge

    Build the Docker Image

    Build the Docker image using the following parameters:

    docker build -t <USERNAME>/weather-app --build-arg BUILD_DATE=$(date -u +'%Y-%m-%dT%H:%M:%SZ') 
    --build-arg APPLICATION_NAME=weather-app --build-arg BUILD_VERSION=v1.0  -f Dockerfile .
  3. Challenge

    Push the Image to Docker Hub

    Push the weather-app image to Docker Hub.

    docker push <USERNAME>/weather-app
  4. Challenge

    Create the `weather-app` Container

    Start the weather-app container.

    docker run -d --name demo-app -p 80:3000 --restart always <USERNAME>/weather-app
  5. Challenge

    Check Out Version v1.1 of the Weather App

    In the weather-app directory, check out version v1.1 of the weather app.

    cd weather-app
    git checkout v1.1
    cd ../ 
  6. Challenge

    Rebuild the `weather-app` Image

    Rebuild and push the weather-app image.

    docker build -t <USERNAME>/weather-app --build-arg BUILD_DATE=$(date -u +'%Y-%m-%dT%H:%M:%SZ') /
    --build-arg APPLICATION_NAME=weather-app --build-arg BUILD_VERSION=v1.1  -f Dockerfile .
    docker push <USERNAME>/weather-app

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