how to run docker code example

Example 1: how to start docker

systemctl start docker.service
#(OR)
systemctl start docker
# it will start docker

Example 2: run docker

docker run -d -p 80:80 docker/getting-started

Example 3: how run dockerfile

# Use the official image as a parent image.
FROM node:current-slim

# Set the working directory.
WORKDIR /usr/src/app

# Copy the file from your host to your current location.
COPY package.json .

# Run the command inside your image filesystem.
RUN npm install

# Inform Docker that the container is listening on the specified port at runtime.
EXPOSE 8080

# Run the specified command within the container.
CMD [ "npm", "start" ]

# Copy the rest of your app's source code from your host to your image filesystem.
COPY . .