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Real-World SRE

You're reading from   Real-World SRE The Survival Guide for Responding to a System Outage and Maximizing Uptime

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Product type Paperback
Published in Aug 2018
Publisher Packt
ISBN-13 9781788628884
Length 340 pages
Edition 1st Edition
Languages
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Author (1):
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Nat Welch Nat Welch
Author Profile Icon Nat Welch
Nat Welch
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Table of Contents (13) Chapters Close

Preface 1. Introduction FREE CHAPTER 2. Monitoring 3. Incident Response 4. Postmortems 5. Testing and Releasing 6. Capacity Planning 7. Building Tools 8. User Experience 9. Networking Foundations 10. Linux and Cloud Foundations Other Books You May Enjoy Index

Sending an HTTP request

One of my favorite interview questions, which seems to be used by just about everyone, is to ask the interviewee to describe all of the steps of an HTTP request. There are lots of ways you could dig into this. I once had someone explain to me how the computer interprets keyboard presses. While that is fascinating, for now we will walk through the networking side of things.

Let's say you type natwelch.com/resume into your browser. We will go through all of the steps that happen for that to deliver content for your browser to render.

DNS

DNS (domain name system): Computers talk to each other using IP addresses and DNS translates a domain into an IP address. Technically, DNS does a little more than that, but let's start by describing domain names and go from there. In our example, natwelch.com is the domain and /resume is the path.

DNS

Figure 3: In all three of the above domains, natwelch on the left is the domain. In the first example, com is the TLD. In the second...

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