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)

Defining multiple alerts for a service

In many cases, one alert per service is not enough. We need to be able to define multiple specifications. Docker Flow Monitor allows us that by adding an index to labels. We can, for example, define labels com.df.alertName.1, com.df.alertName.2, and com.df.alertName.3. As a result, Docker Flow Monitor would create three alerts.

Let's see it in action.

We'll update the node-exporter service in the exporter stack so that it registers two alerts.

docker service update \  
    --label-add com.df.alertName.1=mem_load \
    --label-add com.df.alertIf.1='(sum by (instance)\(node_memory_MemTotal)\
- sum by (instance) (node_memory_MemFree +\
node_memory_Buffers + node_memory_Cached)) / sum by (instance)\ (node_memory_MemTotal) > 0.8' \ --label-add com.df.alertName.2=diskload \ --label-add com.df.alertIf.2='(node_filesystem_size...