Book Image

Docker Orchestration

By : Randall Smith
Book Image

Docker Orchestration

By: Randall Smith

Overview of this book

Docker orchestration is what you need when transitioning from deploying containers individually on a single host to deploying complex multi-container apps on many machines. This book covers the new orchestration features of Docker 1.12 and helps you efficiently build, test, and deploy your application using Docker. You will be shown how to build multi-container applications using Docker Compose. You will also be introduced to the building blocks for multi-host Docker clusters such as registry, overlay networks, and shared storage using practical examples. This book gives an overview of core tools such as Docker Machine, Swarm, and Compose which will enhance your orchestration skills. You’ll learn how to set up a swarm using the decentralized building block. Next, you’ll be shown how to make the most out of the in-built orchestration feature of Docker engine and you’ll use third-party tools such as Kubernetes, Mesosphere, and CoreOS to orchestrate your existing process. Finally, you will learn to deploy cluster hosts on cloud services and automate your infrastructure.

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Table of Contents (17 chapters)
Docker Orchestration
Docker Orchestration
Credits
Credits
About the Author
About the Author
About the Reviewer
About the Reviewer
www.PacktPub.com
www.PacktPub.com
Customer Feedback
Customer Feedback
Preface
Preface
Free Chapter
1
Getting Started with Docker Orchestration
Getting Started with Docker Orchestration
Installing Docker Engine
Installing with Docker Machine
Introducing Docker-specific distributions
Running single container applications
Inspecting your container
Summary
2
Building Multi-Container Applications with Docker Compose
Building Multi-Container Applications with Docker Compose
Building an image with Docker Engine
Installing Docker Compose
Writing a Docker Compose file
Multi-container applications
Extending compose files
Using Docker networks
Keeping your data safe in volumes
Summary
3
Cluster Building Blocks – Registry, Overlay Networks, and Shared Storage
Cluster Building Blocks – Registry, Overlay Networks, and Shared Storage
Creating a Docker Registry
Connecting containers with overlay networks
Using shared network storage for Docker volumes
Summary
4
Orchestration with Docker Swarm
Orchestration with Docker Swarm
Setting up a swarm
Managing a swarm
Recovering from a disaster
Managing services
Introducing Docker Datacenter
Summary
5
Deploying and Managing Services with Kubernetes
Deploying and Managing Services with Kubernetes
Getting to know Kubernetes
Installing Kubernetes
Managing resources
Running pods
Networking
Using volumes
Further reading
Summary
6
Working with Mesosphere
Working with Mesosphere
Getting started with DC/OS
Managing applications
Using network services and load balancing
Providing persistent storage
Using a private registry
Summary
7
Using Simpler Orchestration Tools – Fleet and Cattle
Using Simpler Orchestration Tools – Fleet and Cattle
Using Fleet
Using Rancher Cattle
Further reading
Summary
8
Monitoring Your Cluster
Monitoring Your Cluster
Logging with containers
Collecting and graphing performance data
Considerations for monitoring system health
Summary
9
Using Continuous Integration to Build, Test, and Deploy Containers
Using Continuous Integration to Build, Test, and Deploy Containers
The importance of using CI
Using GitLab for CI
Using Docker Cloud for CI
Summary
10
Why Stop at Containers? Automating Your Infrastructure
Why Stop at Containers? Automating Your Infrastructure
Configuring Docker hosts
Automating host deployment
Scaling down nodes
Summary

Managing resources

Every resource in Kubernetes is defined in a file in either JSON or YAML format. The two formats are completely interchangeable. YAML is usually easier for a human to read. It is possible to have some resources defined in YAML and others in JSON. As a best practice, pick a format and stick to it.

Creating resources

All resources will have at least two fields:

  • apiVersion: This is the version of the API that is being used. As new features are added, the version may change.

  • kind: This is the type of resource. This tells Kubernetes what type of resource is being created.

Each resource may be defined in a separate file. In some cases, it is worth combining resources into a single file. For example, it makes sense to define an ingress object in the same file as the service that it exposes. In that case, separate the resources with three dashes, ---, alone on a line. Following is an example showing how to do this:

apiVersion: v1 
kind: Service 
metadata: 
  name: wp...
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