Book Image

The DevOps 2.2 Toolkit

By : Viktor Farcic
Book Image

The DevOps 2.2 Toolkit

By: Viktor Farcic

Overview of this book

Building on The DevOps 2.0 Toolkit and The DevOps 2.1 Toolkit: Docker Swarm, Viktor Farcic brings his latest exploration of the Docker technology as he records his journey to explore two new programs, self-adaptive and self-healing systems within Docker. The DevOps 2.2 Toolkit: Self-Sufficient Docker Clusters is the latest book in Viktor Farcic’s series that helps you build a full DevOps Toolkit. This book in the series looks at Docker, the tool designed to make it easier in the creation and running of applications using containers. In this latest entry, Viktor combines theory with a hands-on approach to guide you through the process of creating self-adaptive and self-healing systems. Within this book, Viktor will cover a wide-range of emerging topics, including what exactly self-adaptive and self-healing systems are, how to choose a solution for metrics storage and query, the creation of cluster-wide alerts and what a successful self-sufficient system blueprint looks like. Work with Viktor and dive into the creation of self-adaptive and self-healing systems within Docker.
Table of Contents (18 chapters)

Scaling cluster nodes automatically

We created the last piece of the chain. Jenkins job will scale nodes of a cluster only if something triggers it. We did that manually by sending POST requests but, as you might have guessed, that is not our ultimate goal. We need to run those builds through alerts based on metrics. Therefore, we'll move back to the beginning of the chain and explore some of the metrics we can use and try to convert them into meaningful alerts.

Let's open Prometheus and try to define an alert worthy of our scaling needs.

open "http://$CLUSTER_DNS/monitor"

Please use admin as both the User Name and the Password if you're asked to authenticate.

We'll start with an expression we already used in the previous chapters.

Please type the query that follows in the Expression field, click the Execute button, and switch to the Graph tab.