Category Archives: DevOps

Building A Self-Sufficient Docker Cluster

A self-sufficient system is a system capable of healing and adaptation. Healing means that the cluster will always be in the designed state. As an example, if a replica of a service goes down, the system needs to bring it back up again. Adaptation, on the other hand, is about modifications of the desired state so that the system can deal with changed conditions. A simple example would be increased traffic. When it happens, services need to be scaled up. When healing and adaptation are automated, we get self-healing and self-adaptation. Together, they both a self-sufficient system that can operate without human intervention.

How does a self-sufficient system look? What are its principal parts? Who are the actors?
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The Four Quadrants of A Dynamic And Self-Sufficient System

Any system that intends to be fully automated and self-sufficient must be capable of self-healing and self-adaptation. As a minimum, it needs to be able to monitor itself and perform certain actions both on service and infrastructure levels.

Two axes can represent the set of actions a system might execute. One group of actions be represented through the differences between infrastructure and services. The other axis can be explained by the type of activities, with self-healing on one end, and self-adaptation on the other.
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The DevOps Toolkit Series Continues: 2.2 Is Born

The third installment in The DevOps Toolkit Series is public! Even though, while I’m writing this post, only 20% of The DevOps 2.2 Toolkit: Self-Healing Clusters is finished, I hope you’ll pick it up and send me your feedback. I need your help in setting the direction of the book. I need you to help me shape it into something great. I need you to help me make this book a community effort.

Please get it from leanpub.com/the-devops-2-2-toolkit. I’m waiting for your feedback.

What follows is the preface to The DevOps 2.2 Toolkit: Self-Healing Clusters book.
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Zombies Are Muttering “Agile”, “DevOps”, “Containers”, “Big Data”, and “Microservices”

DevOps is the word of the year. Everyone speaks about it, and many are hoping to apply it, even though most are confused what it truly means.

Inquiring about DevOps does not seem to help. If you speak with a software vendor, he’ll tell you that all you need to become DevOps ninja is to purchase his product. Puppet, Chef, Ansible, Docker, Terraform, Packer, Jenkins, Nexus, Git… Every software vendor seems to have a DevOps sticker attached to his product. You’ll notice those stickers being right next to “we make Docker easy” and “we convert your architecture into microservices.”
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