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Create An Image for a Python Application

Docker Documentation References:

Dockerfile

docker build

docker run

docker images

docker rmi

Other Documentation References:

Python

Intent

The purpose of this kata is to familiarize yourself with the process of creating the simplest possible image for running a python application.

Overivew

In this exercise we will create a simple Python application and place it in a Docker Image. We will then run that image. When we are done we will remove the image and its associated containers.

Kata Steps

Create a Python Application

Command:

Create a directory called pycode and change directory into that location.

mkdir pycode && cd pycode

Use an editor to create a file named hello_world.py, or use the file contained in this repository

The file should contain the following code

print('Hello World')

Test the application

Command

python hello_world.py

Output

thought:DockerKata rich$ python hello_world.py
Hello World

Create a Dockerfile

Use an editor to create a file name python_hello_world_Dockerfile, or copy the python_hello_world_Dockerfile from this repository.

The file should contian the following

FROM python:alpine
MAINTAINER [email protected]

COPY hello_world.py /

ENTRYPOINT [ "python", "hello_world.py" ]

Build the Image

Command

docker build -f python_hello_world_Dockerfile .

Output

thought:DockerKata rich$ docker build -f python_hello_world_Dockerfile .
Sending build context to Docker daemon 390.1 kB
Step 1/4 : FROM python:alpine
 ---> cb178ebbf0f2
Step 2/4 : MAINTAINER [email protected]
 ---> Using cache
 ---> 3c394b1b607a
Step 3/4 : COPY hello_world.py /
 ---> c3b4d01fefd2
Removing intermediate container c9168e27bf8a
Step 4/4 : ENTRYPOINT python hello_world.py
 ---> Running in 1159a6589c4f
 ---> c5c27efb5127
Removing intermediate container 1159a6589c4f
Successfully built c5c27efb5127

List Images

Command

docker images

Output

REPOSITORY                                   TAG                 IMAGE ID            CREATED             SIZE
<none>                                       <none>              167b6bbcdc92        54 seconds ago      88.6 MB

Note: We will use the IMAGE ID which will differ from machine to machine, so you must select what is on your computer for the next two steps.

Run the Image

Command

docker run 167b6bbcdc92

Output

thought:DockerKata rich$ docker run 167b6bbcdc92
Hello World

Return to the root directory

Command

cd ..

Delete the Image (and related container)

Command

docker rmi -f 167b6bbcdc92

Output

thought:DockerKata rich$ docker rmi -f 167b6bbcdc92
Deleted: sha256:167b6bbcdc923383d418579e9aa9e91e455aa3f32af440223d4b4b8f797d7b02
Deleted: sha256:9966dcc31ceb9c1ba920c4fcbf45da6cda2d3fae2157dc017d51998312ac6bd2

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