November 2020
Beginner to intermediate
250 pages
7h 41m
English
Content preview from 97 Things Every SRE Should Know
Become an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
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.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.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.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.
Chapter 10. How Wikipedia Is Served to You
Effie Mouzeli
According to Wikipedia, “Wikipedia is a multilingual, web-based, free-content encyclopedia project supported by the Wikimedia Foundation and based on a model of openly editable content.” Serving billions of page views per month, Wikipedia is one of highest-traffic websites in the world. Let me explain what happens when you are visiting Wikipedia to read about Saint Helena or llamas.
First, these are the three most important building blocks of our infrastructure:
The CDN (content delivery network), which is our caching layer
The application layer
Open-source software
When you request a page, the magic of our geographic DNS and internet routing sends this request to the nearest Wikimedia data center, based on your location, while with the wizardry of TLS, ATS (Apache Traffic Server) encrypts your connection. Each data center has two caching layers: in-memory (Varnish) and on disk (ATS). Most requests terminate here, because the hottest URLs are always cached. In case of cache misses, the request will be forwarded to the application layer, which might be very near if this is a primary data center, or a bit farther away if this is a caching point.
Our application layer has MediaWiki at its core, supported by a number of microservices and databases. MediaWiki is an Apache, PHP, MySQL open-source application, ...
Become an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
and much more.
Read now
Unlock full access
More than 5,000 organizations count on O’Reilly
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.