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The DevOps 2.2 Toolkit

You're reading from   The DevOps 2.2 Toolkit Self-Sufficient Docker Clusters

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Product type Paperback
Published in Mar 2018
Publisher Packt
ISBN-13 9781788991278
Length 360 pages
Edition 1st Edition
Tools
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Author (1):
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Viktor Farcic Viktor Farcic
Author Profile Icon Viktor Farcic
Viktor Farcic
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Table of Contents (18) Chapters Close

Preface 1. Introduction to Self-Adapting and Self-Healing Systems FREE CHAPTER 2. Choosing a Solution for Metrics Storage and Query 3. Deploying and Configuring Prometheus 4. Scraping Metrics 5. Defining Cluster-Wide Alerts 6. Alerting Humans 7. Alerting the System 8. Self-Healing Applied to Services 9. Self-Adaptation Applied to Services 10. Painting the Big Picture – The Self-Sufficient System Thus Far 11. Instrumenting Services 12. Self-Adaptation Applied to Instrumented Services 13. Setting Up a Production Cluster 14. Self-Healing Applied to Infrastructure 15. Self-Adaptation Applied to Infrastructure 16. Blueprint of a Self-Sufficient System 17. Other Books You May Enjoy

Extending the capacity of the cluster

Among other resources, Docker For AWS template created two auto-scaling groups. One is used for masters and the other for workers. Those security groups have multiple purposes.

If we choose to update the stack to, for example, change the size of the nodes or upgrade Docker server to a newer version, the template will temporarily increase the number of nodes by one and shut down one of the old ones. The replicas that were running on the old server will be moved to the new one. Once the new server is created, it will move to the next, and the next after that, all the way until all the nodes are replaced. The process is very similar to rolling updates we performed by Swarm when updating services. The same process is done whenever we decide to update any aspect of the Docker For AWS stack.

Similarly, if one of the nodes fail health checks, the...

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