Docker Test

Basic commands

The following commands maybe run only with sudo permissions.

• List all containers (including hiding ones)
  $ docker container ls --all
• List docker images
  $ docker image ls
• Test docker installation with hello-world container
  $ docker run hello-world

Dockerfile

Dockerfile it is a file that defines what goes on in the environment inside your container.
Example:

    # Use an official Python runtime as a parent image
    FROM python:3.6

    # Set the working directory to /app
    WORKDIR /app

    # Copy the current directory contents into the container at /app
    COPY . /app

    # Install any needed packages specified in requirements.txt
    RUN pip install --trusted-host pypi.python.org -r requirements.txt

    # Make port 80 available to the world outside this container
    EXPOSE 80

    # Define environment variable
    ENV NAME World

    # Run app.py when the container launches
    CMD ["python", "app.py"]

Building and running your container

Building

Using the previous Dockerfile, now build your container, with python code and requirements.

• Command for building the docker container
  $ docker build --tag=friendlyhello .
  The --tag option defines the container's name

Running

• To run the app and map it on your machine's port 4000 and the published container port 80 using -p:
  $ docker run -p 4000:80 friendlyhello
• For running your container in the background, just use -d option:
  $ docker run -d -p 4000:80 friendlyhello
• Stop your container using the following command:
  $ docker container stop CONTAINER_ID
  You can get your container id using container list command