Book Image

Mastering CoreOS

By : Sreenivas Makam
Book Image

Mastering CoreOS

By: Sreenivas Makam

Overview of this book

<p>CoreOS makes Google and Amazon-style Cloud infrastructure available for anyone building their own private Cloud. This book covers the CoreOS internals and the technologies used in the deployment of container-based distributed applications. It starts with an overview of CoreOS and distributed application development while sharing knowledge on related technologies. Critical CoreOS services and networking and storage considerations for CoreOS are covered next.</p> <p>In latter half of the book, you will learn about Container runtime systems such as Docker and Rkt and Container Orchestration using Kubernetes. You will also find out about the integration of popular orchestration solutions such as OpenStack, the AWS Container service, and the Google Container Engine with CoreOS and Docker. Lastly, we cover troubleshooting as well as production considerations.</p>

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Mastering CoreOS
Sreenivas Makam
Feb, 2016 | 382 pages
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Table of Contents (19 chapters)
Mastering CoreOS
Mastering CoreOS
Credits
Credits
About the Author
About the Author
Acknowledgments
Acknowledgments
About the Reviewers
About the Reviewers
www.PacktPub.com
www.PacktPub.com
Preface
Preface
Free Chapter
1
CoreOS Overview
CoreOS Overview
Distributed application development
A minimalist Container-optimized OS
Containers
CoreOS
Docker versus Rkt
A workflow for distributed application development with Docker and CoreOS
Summary
References
Further reading and tutorials
2
Setting up the CoreOS Lab
Setting up the CoreOS Lab
Cloud-config
The CoreOS cluster with Vagrant
A CoreOS cluster with AWS
A CoreOS cluster with GCE
CoreOS installation on Bare Metal
Basic debugging
Summary
References
Further reading and tutorials
3
CoreOS Autoupdate
CoreOS Autoupdate
The CoreOS release cycle
The partition table on CoreOS
CoreOS automatic update
Update and reboot services
Setting update options
Update examples
CoreUpdate
Vagrant CoreOS update
Summary
References
Further reading and tutorials
4
CoreOS Primary Services – Etcd, Systemd, and Fleet
CoreOS Primary Services – Etcd, Systemd, and Fleet
Etcd
Systemd
Fleet
Summary
References
Further reading and tutorials
5
CoreOS Networking and Flannel Internals
CoreOS Networking and Flannel Internals
Container networking basics
Flannel
Docker networking
Other Container networking technologies
Summary
References
Further reading and tutorials
6
CoreOS Storage Management
CoreOS Storage Management
Storage concepts
The CoreOS filesystem
The container filesystem
Container data
The Docker 1.9 update
Summary
References
Further reading and tutorials
7
Container Integration with CoreOS – Docker and Rkt
Container Integration with CoreOS – Docker and Rkt
Container standards
Docker
Rkt
Summary
References
Further reading and tutorials
8
Container Orchestration
Container Orchestration
Modern application deployment
Container Orchestration
Application definition
Packaged Container Orchestration solutions
Summary
References
Further reading and tutorials
9
OpenStack Integration with Containers and CoreOS
OpenStack Integration with Containers and CoreOS
An overview of OpenStack
CoreOS on OpenStack
OpenStack and Containers
Container networking using OpenStack Kuryr
Summary
References
Further reading and tutorials
10
CoreOS and Containers – Troubleshooting and Debugging
CoreOS and Containers – Troubleshooting and Debugging
CoreOS Toolbox
Other CoreOS debugging tools
Container monitoring
The Docker remote API
Container logging
Summary
References
Further reading and tutorials
11
CoreOS and Containers – Production Considerations
CoreOS and Containers – Production Considerations
CoreOS cluster design considerations
Distributed infrastructure design considerations
Security
Deployment and automation
The CoreOS roadmap
The Docker roadmap
Microservices infrastructure
Summary
References
Further reading and tutorials
Index
Index

CoreOS automatic update

CoreOS relies on the automatic update mechanism to keep the OS up to date. The following are some aspects of the CoreOS update:

  • The CoreOS update mechanism is based on Google's open source Omaha protocol (https://code.google.com/p/omaha/) that is used in the Chrome browser.

  • Either CoreOS public servers or private servers can be used as an image repository.

  • The dual partition scheme is used where an update is done to the secondary partition while the primary partition is not touched. On reboot, there is a binary swap from the primary to the secondary partition. This keeps the update scheme robust. If there are issues with the new image, CoreOS automatically rolls back to the working image in the other partition.

  • Images are signed and verified on each update.

The following screenshot shows you the steps for the automatic update:

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