October 2013
Intermediate to advanced
261 pages
7h 4m
English
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Chapter 10. File Storage for Multiple Web Servers
In this chapter, we will discuss the options for file storage in infrastructures with multiple web nodes. Ensuring your file storage is coherent and synchronized between your web nodes is often the redheaded stepchild of infrastructure design—most everyone is aware that you need all your web nodes to agree on database information, and quite a few know that your object cache needs to be coherent. However, the complication of ensuring your static files are synchronized between web nodes is often overlooked.
Why is this important? Imagine that a user goes to your site and uploads an avatar. That user’s avatar is written to disk on webnode1. If there is a delay in that file becoming available on webnode2—or worse, if its not synchronized at all—users will start seeing broken image links for that file. Even if your site doesn’t accept user uploads, Drupal creates its own JS/CSS aggregate files on disk, and if those don’t exist on both web nodes, you will quickly hit issues on the web node without them. Keep this in mind while debugging “strange issues” that may come up on your infrastructure (certain users not seeing CSS correctly, 404s on only certain web nodes, etc.). It is easy to forget how important coherent file storage is to a functional website.
Now that we understand why this is important, we can cover a few different methods of maintaining this consistency when using multiple web nodes. In this chapter, we will discuss some of ...
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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.