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)

Proxy role in the system

Every cluster needs a proxy that will receive requests coming to a single port and forward them to destination services. The only exception is when we have only one public-facing service. In that case, it is questionable not only whether we need a proxy but whether we need a cluster at all.

When a request comes to the proxy, it is evaluated and, depending on its path, domain, or a few other headers, forwarded to one of the services.

Docker made quite a few aspects of proxies obsolete. There is no reason for load balancing. Docker's Overlay network does that for us. There's no need to maintain IPs of the nodes where services are hosted. Service discovery does that for us. Evaluation of headers and forwarding is pretty much everything that a proxy should do.

Since Docker Swarm utilizes rolling updates whenever an aspect of a service is changed...