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)

Using memory reservations and limits in Prometheus

Metrics obtained through cAdvisor are not restricted to actual usage. We have, among others, metrics based on container specs. We can, for example, retrieve memory limits with the metric container_spec_memory_limit_bytes.

Please type container_spec_memory_limit_bytes{container_label_com_docker_stack_namespace!=""} in the Expression field and click the Execute button. The result should be straight lines that represent memory limits we defined in our stacks.

The usage of the container_label_com_docker_stack_namespace label is important. We used it to filter the metrics so that only those that come from the stacks are included. That way, we excluded root metrics from cAdvisor that provide summarized totals.

In Prometheus, memory limits are not very useful in themselves. However, if we combine them with the actual memory...