Creating Images Using a Dockerfile

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Creating Images Using a Dockerfile

You’ve decided to Dockerize your weather-app. Before you can do this, you'll need to create an image for it. And you'll want to keep the image small, so you will create it using a multi-stage build. Using instructions in a Dockerfile, build the image, then test it by creating a container that uses it.

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Lab Info

Level

Intermediate

Last updated

Sep 15, 2025

Duration

1h 0m

Challenge

Create a docker file

Create a docker file:

vi Dockerfile

Dockerfile contents:

FROM node AS source
RUN mkdir -p /node/weather-app
ADD src/ /node/weather-app
WORKDIR /node/weather-app
RUN npm install

FROM node:alpine
ARG APP_VERSION=V1.1
LABEL org.label-schema.version=$APP_VERSION
ENV NODE_ENV="production"
COPY --from=source /node/weather-app /node/weather-app
WORKDIR /node/weather-app
EXPOSE 3000
ENTRYPOINT ["./bin/www"]

Challenge

Build the image

Use Git commit hash as the image tag:

cd src
git log -1 --pretty=%H
cd ../

Build the image:

sudo docker image build -t linuxacademy/weather-app:[HASH] --build-arg APP_VERSION=2.0 .

Challenge

Deploy a test container using the image just created

Create the weather-app container:

sudo docker container run -d --name weather-app -p 8080:3000 linuxacademy/weather-app:<HASH>

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