May 2017
Intermediate to advanced
436 pages
9h 44m
English
Content preview from The DevOps 2.1 Toolkit: Docker Swarm
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Persisting stateful services without replication
Jenkins is a good example of a stateful service that forces us to preserve its state. Moreover, it is incapable of sharing or synchronizing state between multiple instances. As a result, it cannot scale. There cannot be two Jenkins masters with the same or replicated state. Sure, you can create as many masters as you want but each will be an entirely separate service without any relation to other instances.
The most obvious negative side-effect of Jenkins inability to scale horizontally is performance. If a master is under heavy load, we cannot create a new instance and thus reduce the burden from the original.
There are only three types of services that can be scaled. They need to be stateless, ...
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O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.Julian F.
I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.Amir M.
I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.