Book Image

CoreOS Essentials

By : Rimantas Mocevicius
Book Image

CoreOS Essentials

By: Rimantas Mocevicius

Overview of this book

<p>This book will help you get up and running on using CoreOS to develop effective computing networks. You will begin with understanding the basics of CoreOS. You will then discover what etcd is and how it is used, followed by launching Docker containers with systemd and fleet. Learn how to manage clusters, read system logs, and customize with cloud-config. You will set up the deployment to production using Docker builder and a private Docker registry. You will also see how to set up and use CoreUpdate and Enterprise Registry, and get an introduction to the new App Container called rkt and the newly introduced cluster manager known as Kubernetes.</p> <p>This book will equip you with all the information you need to leverage the power of CoreOS and the related containers for the effective deployment of your applications.</p>
Table of Contents (17 chapters)
CoreOS Essentials
Credits
About the Author
About the Reviewers
www.PacktPub.com
Preface
Index

PaaS based on fleet


In this chapter and in previous chapters, we explained how to use fleet to deploy our different services on our clusters. Fleet is a powerful and easy-to-use low-level cluster manager that controls systemd at the cluster level. However, it lacks a web UI, easy orchestration tools, and so on, so this is where PAZ, the nice PaaS, steps in to help us out.

Deploying services using PAZ

The website at http://www.paz.sh has a very nice and user-friendly web UI, which makes it much easier to set up a CoreOS cluster. PAZ also has an API that you can use if you want to automate things via scripts.

Through its dashboard, you can add and edit your services, check the status of the cluster (viewed by host or by unit), and view monitoring information and logs for the cluster.

It fully leverages fleet to orchestrate services across the machines in a cluster. It is built in Node.js and all its services run as Docker containers.

The following pointers explain how PAZ works:

  • Users can declare...