September 2018
Intermediate to advanced
587 pages
17h 34m
English
Content preview from Seeking SRE
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Chapter 24. Immutable Infrastructure and SRE
Immutable infrastructure can significantly reduce the amount of toil required to maintain a large fleet of production servers. It does this by reducing the number of variables in the system and making it easier to swap pieces out because all instances of a service are identical.
Scalability, Reliability, and Performance
SRE has perhaps become overloaded, but at its core, the definition boils down to a few things: driving scalability, reliability, and performance for web operations at scale. A challenging, but incredibly powerful, piece of that is through immutable infrastructure.
Immutable infrastructure is the practice of starting each build of a software component with a small base image and then installing your software onto that image. For every release, this image is rebuilt before being released to production. After it is released, the image is never changed or updated. It is only replaced with a new image. The process is called “immutable” because the released software is frozen and never changed, only replaced. The running instances are never updated via a tool like Puppet, Chef, or even Secure Shell (SSH) after they are launched (they might still have SSH running for debugging purposes).
Immutable infrastructure delivers scalability and performance by allowing horizontal scaling of your infrastructure. One of the challenges of adding and removing nodes from a running cluster is making ...
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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.