Docker is an enterprise-grade container platform that allows you to build and deploy your apps. Its portable format lets you run your code anywhere, from your desktop workstation, to popular cloud computing providers. This book will help you realize the full potential of Docker.
In this book, you will learn a lot about how Docker works. You will learn the basics of Docker, along with some of the fundamental concepts of web operations. You will gain knowledge of Docker and the relevant operating system concepts to get a deeper understanding of what is happening behind the scenes. You will also learn a lot about the tools to deploy and troubleshoot our Docker containers in production in a scalable and manageable fashion.
If you are a software developer with a good understanding of managing Docker services and the Linux file system, and are looking for ways to optimize working with Docker containers, then this is the book for you. Developers fascinated by containers and workflow automation will also benefit from this book.
Chapter 1, Preparing Docker Hosts, helps you familiarize yourself with Docker Engine and how to prepare a Docker host. We will then build a PKI to ensure secure communication between our Docker host and our Docker client workstation. We will also build a small Docker Swarm cluster, consisting of multiple Docker hosts.
Chapter 2, Configuring Docker with Chef, shows how to automate the configuration of our Docker deployments. We will also use Chef, a piece of configuration management software, to manage Docker hosts in scale.
Chapter 3, Monitoring Docker, helps us to understand the importance of monitoring and collecting metrics in Prometheus. We will also learn how to consolidate logs in an ELK stack.
Chapter 4, Optimizing Docker Images, discusses optimizing our Docker images and improving our development workflow. We will also learn to reduce image deployment time and improve image build time.
Chapter 5, Deploying Containers, looks at how we can use Jenkins to build, distribute, and deploy our containerized application. We will also learn to build and deploy a simple application using a three-stage pipeline.
Chapter 6, Benchmarking, helps us create benchmarks to gauge the performance of our Docker application.
Chapter 7, Load Balancing, talks about how to scale out our Docker applications to increase our capacity. We will use load balancers, which are a key component in the architecture of various web scale applications. We will also learn to balance load with NGINX.
Chapter 8, Troubleshooting Containers, inspects containers with Docker exec, and help us understand what debugging is, along with other container debugging tools.
Chapter 9, Onto Production, wraps up the book by teaching us how to perform web operations. We will also learn to deploy and scale our applications.
- A Linux workstation with a recent kernel is needed to serve as a host for Docker CE 18.09.0. This book uses CentOS 7 as its base operating system to install and set up Docker.
- More details on how to get Docker up and running is covered in Chapter 1, Preparing Docker Hosts.
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There are a number of text conventions used throughout this book.
CodeInText: Indicates code words in text, database table names, folder names, filenames, file extensions, pathnames, dummy URLs, user input, and Twitter handles. Here is an example: "First, we will create a directory for our PKI and generate the CA's private key in a file called ca-key.pem."
A block of code is set as follows:
{
"tlsverify": true,
"tlscacert": "/etc/docker/ca.pem",
"tlskey": "/etc/docker/server-key.pem",
"tlscert": "/etc/docker/server.pem"
}Any command-line input or output is written as follows:
dockerhost$ systemctl daemon-reload dockerhost$ systemctl restart docker.service
Bold: Indicates a new term, an important word, or words that you see onscreen. For example, words in menus or dialog boxes appear in the text like this. Here is an example: " In the form field labeled Name, set the value to Unicorn Capacity."
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