=== Docker image bauen ===
[Optional] mit -f den Namen der Dockerfile angeben.
<code>

docker build -t <tag-name> . -f <file-name>
</code>

=== Docker image speichern ===
<code>
docker save -o image.tar <username>/<app>
</code>

=== Docker image laden ===
<code>
docker load -i <path to image tar file>
</code>

=== .dockerignore ===
<code>
node_modules
npm-debug.log
</code>

=== Example Dockerfile === 
<code>
FROM node:18

# Create app directory
WORKDIR /usr/src/app

# Install app dependencies
# A wildcard is used to ensure both package.json AND package-lock.json are copied
# where available (npm@5+)
COPY package*.json ./

RUN npm install
# If you are building your code for production
# RUN npm ci --omit=dev

# Bundle app source
COPY . .

EXPOSE 8080
CMD [ "node", "server.js" ]
</code>