Book Image

The Docker Workshop

By : Vincent Sesto, Onur Yılmaz, Sathsara Sarathchandra, Aric Renzo, Engy Fouda
5 (1)
Book Image

The Docker Workshop

5 (1)
By: Vincent Sesto, Onur Yılmaz, Sathsara Sarathchandra, Aric Renzo, Engy Fouda

Overview of this book

No doubt Docker Containers are the future of highly-scalable software systems and have cost and runtime efficient supporting infrastructure. But learning it might look complex as it comes with many technicalities. This is where The Docker Workshop will help you. Through this workshop, you’ll quickly learn how to work with containers and Docker with the help of practical activities.? The workshop starts with Docker containers, enabling you to understand how it works. You’ll run third party Docker images and also create your own images using Dockerfiles and multi-stage Dockerfiles. Next, you’ll create environments for Docker images, and expedite your deployment and testing process with Continuous Integration. Moving ahead, you’ll tap into interesting topics and learn how to implement production-ready environments using Docker Swarm. You’ll also apply best practices to secure Docker images and to ensure that production environments are running at maximum capacity. Towards the end, you’ll gather skills to successfully move Docker from development to testing, and then into production. While doing so, you’ll learn how to troubleshoot issues, clear up resource bottlenecks and optimize the performance of services. By the end of this workshop, you’ll be able to utilize Docker containers in real-world use cases.

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Table of Contents (17 chapters)
Preface
About the Book
1
1. Running My First Docker Container
1. Running My First Docker Container
Introduction
Advantages of Using Docker
Docker Engine
Running Docker Containers
Managing Docker Containers
Attaching to Containers Using the attach Command
Summary
Free Chapter
2
2. Getting Started with Dockerfiles
2. Getting Started with Dockerfiles
Introduction
What Is a Dockerfile?
Common Directives in Dockerfiles
Building Docker Images
Other Dockerfile Directives
Summary
3
3. Managing Your Docker Images
3. Managing Your Docker Images
Introduction
Docker Layers and Caching
Creating Base Docker Images
Docker Image Naming and Tagging
Using the latest Tag in Docker
Docker Image Tagging Policies
Storing and Publishing Your Docker Images
The Docker Registry
Summary
4
4. Multi-Stage Dockerfiles
4. Multi-Stage Dockerfiles
Introduction
Normal Docker Builds
What Is the Builder Pattern?
Introduction to Multi-Stage Dockerfiles
Dockerfile Best Practices
Summary
5
5. Composing Environments with Docker Compose
5. Composing Environments with Docker Compose
Introduction
Docker Compose CLI
Configuration of Services
Service Dependency
Summary
6
6. Introduction to Docker Networking
6. Introduction to Docker Networking
Introduction
Native Docker DNS
Native Docker Network Drivers
Docker Overlay Networking
Non-Native Docker Networks
Summary
7
7. Docker Storage
7. Docker Storage
Introduction
The Container Life Cycle
Stateful versus Stateless Containers/Services
Docker Volumes and Stateful Persistence
Persistent and Ephemeral Volumes
Volumes versus Filesystem and Images
Summary
8
8. CI/CD Pipeline
8. CI/CD Pipeline
Introduction
What Is CI/CD?
Integrating GitHub and Jenkins
Integrating Jenkins and Docker Hub
Summary
9
9. Docker Swarm
9. Docker Swarm
Introduction
How Docker Swarm Works?
Working with Docker Swarm
Troubleshooting Swarm Nodes
Deploying Swarm Deployments from Docker Compose
Swarm Service Rolling Updates
Managing Secrets and Configurations with Docker Swarm
Managing Swarm with Swarmpit
Summary
10
10. Kubernetes
10. Kubernetes
Introduction
Kubernetes Design
The Kubernetes API and Access
Kubernetes Resources
Kubernetes Package Manager: Helm
Summary
11
11. Docker Security
11. Docker Security
Introduction
Privileged and Root User Access in Containers
Signing and Verifying Docker Images
Docker Image Security Scans
Scanning Images Locally Using Anchore Security Scan
Utilizing SaaS Security Scans with Snyk
Using Container Security Profiles
Summary
12
12. Best Practices
12. Best Practices
Introduction
Working with Container Resources
Managing Container CPU Resources
Managing Container Memory Resources
Managing the Container Disk's Read and Write Resources
Container Resources and Docker Compose
Best Practices in Docker
Enforcing Docker Best Practices in Your Code
Summary
13
13. Monitoring Docker Metrics
13. Monitoring Docker Metrics
Introduction
Monitoring Environment Metrics with Prometheus
Monitoring Docker Containers with Prometheus
Understanding the Prometheus Query Language
Performing PromQL Queries
Using Prometheus Exporters
Extending Prometheus with Grafana
Summary
14
14. Collecting Container Logs
14. Collecting Container Logs
Introduction
Introducing Splunk
Installing and Running Splunk on Docker
Getting Container Logs into Splunk
Working with the Splunk Query Language
Splunk App and Saved Searches
Summary
15
15. Extending Docker with Plugins
15. Extending Docker with Plugins
Introduction
Plugin Management
Plugin API
Authorization Plugins
Network Plugins
Volume Plugins
Summary
Appendix
1. Running My First Docker Container
2. Getting Started with Dockerfiles
3. Managing Your Docker Images
4. Multi-Stage Dockerfiles
5. Composing Environments with Docker Compose
6. Introduction to Docker Networking
7. Docker Storage
8. Service Discovery
9. Docker Swarm
10. Kubernetes
11. Docker Security
12. Best Practices
13. Monitoring Docker Metrics
14. Collecting Container Logs
15. Extending Docker with Plugins

Introduction

In the previous chapter, we learned how to run our first Docker container by pulling a pre-built Docker image from the Docker Hub. While it is useful to get pre-built Docker images from Docker Hub, we must know how to create custom Docker images. This is important for running our applications on Docker by installing new packages and customizing the settings of the pre-built Docker images. In this chapter, we are going to learn how to create our custom Docker image and run a Docker container based on it.

This will be done using a text file called a Dockerfile. This file consists of commands that can be executed by Docker to create a Docker image. Docker images are created from a Dockerfile using the docker build (or docker image build) command.

Note

Beginning with Docker 1.13, the Docker CLI syntax has been restructured to the form of Docker COMMAND SUBCOMMAND. For example, the docker build command was replaced by the docker image build command. This restructuring was carried out to clean up the Docker CLI syntax and gain a more consistent grouping of commands. Currently, both syntaxes are supported, but the old syntax is expected to be deprecated in the future.

A Docker image consists of multiple layers, each layer representing the commands provided in the Dockerfile. These read-only layers are stacked on top of one another to create the final Docker image. Docker images can be stored in a Docker registry, such as Docker Hub, which is a place where you can store and distribute Docker images.

A Docker container is a running instance of the Docker image. One or more Docker containers can be created from a single Docker image using the docker run (or docker container run) command. Once a Docker container is created from the Docker image, a new writeable layer will be added on top of the read-only layers from the Docker image. Docker containers can then be listed with the docker ps (or docker container list) command:

Figure 2.1: Image layers and a container layer

Figure 2.1: Image layers and a container layer

As illustrated in the preceding diagram, there can be one or more read-only layers that make up the Docker image. These read-only layers are generated for each command in the Dockerfile during the Docker image build process. Once a Docker container is created from the image, a new read-write layer (known as the Container layer) will be added on top of the image layers and will host all the changes made on the running container.

In this chapter, we will write our first Dockerfile, build the Docker image from the Dockerfile, and run a Docker container from our custom Docker image. Before we can perform any of these tasks, however, we must first define a Dockerfile.

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