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Puppet for Containerization
Puppet for Containerization

Puppet for Containerization: Manage, orchestrate, and deploy containers with Puppet

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Puppet for Containerization

Chapter 2. Working with Docker Hub

In this chapter, we will look at Docker Hub, what it is, how to sign up for an account, how to pull an image, how to push an image, and automated image builds. This will give us a good solid foundation for future topics when we need to work with official images.

In this chapter, we will cover the following topics:

  • What is Docker Hub?
  • Automated builds
  • Working with official images

Working with Docker Hub

In this section, we will discuss Docker Hub, what it is used for, what features does it provide, and lastly, how is it different from other repository sites, such as GitHub or Puppet Forge. We will then create an account and explore our account settings. After this, we will look at official images to get a solid foundation for the next topic.

An overview of Docker Hub

In the last chapter, we looked at the Puppet's repo service, The Forge as it is called by the community (https://forge.puppetlabs.com/). Now, let's look at Docker's repo service, Docker Hub. We can find Docker Hub at https://hub.docker.com/.

The following screenshot shows what the screen looks like:

An overview of Docker Hub

In Docker Hub, there are two type of images:

  • Official images
  • Images authored by developers

First, we will talk about official images. On Docker Hub, you can get official images for just about any major operating system or application. So, the benefit for you as a developer is that the work to install...

Automated builds in Docker Hub

In this topic, we are going to look at how automated builds work at a high level, and how to publish an image via the push method on Docker Hub.

Automated builds

In Docker Hub, we have two ways to publish images: via a simple push method or via an automated build. In this topic, we will cover automated builds. First, we will look at the flow of an automated build. In this example, we will be using GitHub, but you can also use Bitbucket. So, the first thing that we need to do is link our Docker Hub account to our GitHub account. This is done by navigating to Settings | Linked Accounts & Services:

Automated builds

Just follow the prompts to link the accounts.

Once this is completed, let's go to our GitHub account and create a repo. I am going to use the one that I have already set up:

Automated builds

As you can see in the preceding screenshot, the repo contains a Dockerfile. Now, let's looks at the same repo except Docker Hub:

Automated builds

After this, we will look at the Build Details tab:

Automated builds

So, how...

Working with official images

Now that we know how Docker Hub serves images to us, let's look at how to integrate them into our code via three methods. The first will be a Dockerfile, the second will be in the docker-compose.yaml file, and the last will be straight into a Puppet manifest.

Dockerfiles

In this topic, we will look at using nginx in a basic Dockerfile. In a Dockerfile, we need to add a few things. The first is the image that we are basing our application on; for us it will be nginx. The second is a maintainer. It should look like as shown in the following screenshot:

Dockerfiles

As the base nginx image has already got port 80 and 443 exposed, we will not need that configuration for our Dockerfile. The next thing we will add is a simple run command to update the packages in the container. As its base OS is Debian, we will add the command shown on line 5 in the following screenshot:

Dockerfiles

As we are building a simple application, this is all that we are going to add to our Dockerfile. There are...

Summary

In this chapter, we covered a lot about the Docker Hub ecosystem. We discussed what official images are, how automated builds work, and of course, how to work with images in three different ways. After working through this chapter, we now have the tools in our tool belt to build our first application with Puppet.

In the next chapter, we will write our first Puppet module to create a Docker container and we will look at writing rspec-puppet unit tests to make sure that our module does what it's meant to do.

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Key benefits

  • *This is the first book that focuses specifically on the combination of containerization and configuration management tools as the landscape for system administration changes
  • *It demonstrates to administrators how to seamlessly integrate containerization without disrupting their entire system
  • *It provides a canny way for you to grow your tool kit and embrace new tech such as Docker while building on your existing skill set

Description

This book teaches you how to take advantage of the new benefits of containerization systems such as Docker, Kubernetes, Docker Swarm, and Docker UCP, without losing the panoptical power of proper configuration management. You will learn how to integrate your containerized applications and modules with your Puppet workflow. You will also understand how to manage, monitor, and orchestrate hosts to keep deployed containers running seamlessly. With the help of this book, you can efficiently automate and document with containers, as a part of your system. The book will also cover use cases of deploying Puppet within a containerized environment.

Who is this book for?

This book is designed for system administrators who are looking to explore containerization. Intermediate experience and expertise with Puppet is presumed.

What you will learn

  • *Write Puppet modules to build Docker
  • *Create Docker Compose templates with .erb files
  • *Get to know the architecture of Docker schedulers
  • *Create a Docker network and service discovery framework
  • *Build a fully functional Docker scheduler with Puppet
  • *Make Docker production ready with Puppet
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Publication date : May 16, 2016
Length: 222 pages
Edition : 1st
Language : English
ISBN-13 : 9781785883286
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Product Details

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Length: 222 pages
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ISBN-13 : 9781785883286
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Table of Contents

10 Chapters
1. Installing Docker with Puppet Chevron down icon Chevron up icon
2. Working with Docker Hub Chevron down icon Chevron up icon
3. Building a Single Container Application Chevron down icon Chevron up icon
4. Building Multicontainer Applications Chevron down icon Chevron up icon
5. Configuring Service Discovery and Docker Networking Chevron down icon Chevron up icon
6. Multinode Applications Chevron down icon Chevron up icon
7. Container Schedulers Chevron down icon Chevron up icon
8. Logging, Monitoring, and Recovery Techniques Chevron down icon Chevron up icon
9. Best Practices for the Real World Chevron down icon Chevron up icon
Index Chevron down icon Chevron up icon

Customer reviews

Rating distribution
Full star icon Full star icon Full star icon Full star icon Full star icon 5
(1 Ratings)
5 star 100%
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1 star 0%
Ajeet Singh Raina May 19, 2016
Full star icon Full star icon Full star icon Full star icon Full star icon 5
If you are Docker enthusiast and looking for automating your IT infrastructure, this book is for YOU. I am a reviewer of this book and worked hard with author to get it shaped up well. It went over dozens of month of reviewing cycle to finally get this book reach out to you. I have been playing around with Puppet since last 2 and 1/2 years and Docker since past 2 year. Orchestrating Docker using Puppet has been something enterprise IT has been talking about and I think THIS book came at the right time. Starting from the first chapter where it introduces the concept of automating IT till the advanced topic like Scheduling and Orchestrating, this book has everything which devOps really look for. The Infrastructure-as-a-Code has been main theme of this book and I am sure you are going to enjoy implementing it.Hope you like it reading. Thanks for you time.-Ajeet
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