NOPE / "Number of Pink Elephants"

Demonstrating Docker, Dive and httpd

• Introduction
• Docker
  • Build
  • Run
  • Stop
• Docker Hub
• Dive
  • Unpacking the Docker Image with Dive
• Future Ideas
• Contributing to this Project
• Security Policy for this Project

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Introduction

"Number of Pink Elephants"/"NOPE" is a small example Dockerfile project designed to teach (and serve as my own reference for) building, running and hosting Dockerfile images on Github and Docker Hub. Leveraging the publically-maintained httpd image and inserting some .html code, this project documents the process here while being publically available for others to utilise and/or fork.

The website is served via plain-http on port 80 (unlike the image below, this may need mapping). Refreshing the page will give a new random value between 1 and 100.

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Docker

Build

# optional - clone this repository
git clone git@github.com:adambonneruk/nope.git

# navigate to the project folder and build the Dockerfile
cd nope
docker build -t nope .

Run

# prune old images/containers/storage if required
docker system prune

# launch the docker image in the bg, allowing you to continue using the shell
docker run -dit --name nope -p 8080:80 nope:latest

# see running docker containers
docker ps

Stop

docker stop nope

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Docker Hub

Docker Hub Project URL: https://hub.docker.com/repository/docker/adambonneruk/nope

# build the image
docker build -t adambonneruk/nope .

# run the image
docker run -p 8080:80 adambonneruk/nope:latest

# push image to docker hub
docker push adambonneruk/nope:latest

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Dive

Unpacking the Docker Image with Dive

using the Dive tool, we can unpack the container image:

# first install dive
wget https://github.com/wagoodman/dive/releases/download/v0.9.2/dive_0.9.2_linux_amd64.deb
sudo apt install ./dive_0.9.2_linux_amd64.deb

# explore the docker image
sudo dive nope:latest

Executing the dive command:

At the first layer we can see a minimal linux distribution standard filesystem:

At this level we can see apache is being installed to the filesystem:

At the lowest level, we can see my index.html is copied onto the image:

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Future Ideas

• Using PHP instead to load local/internal container IP address

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Contributing to this Project

This project welcomes contributions of all types. We ask that before you start work on a feature that you would like to contribute, please read the Contributor's Guide.

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Security Policy for this Project

This project seeks to build secure, versatile and robust portable software. If you find an issue, please report it following the Security Policy