September 2019
Intermediate to advanced
203 pages
5h 2m
English
Content preview from Learning CoreDNS
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Preface
Why a New DNS Server?
Upon seeing this book, the first question that might occur to you is, “Why does the world need another DNS server?” There are, after all, lots of implementations of DNS servers to choose from. For starters, there’s BIND, for Berkeley Internet Name Domain, the granddaddy of DNS servers. BIND has been around in some incarnation since the 1980s and supports just about every DNS standard written. There’s Microsoft’s DNS Server,1 which is widely used in Active Directory environments. NSD from NLnet Labs and Knot are excellent authoritative DNS servers, and Unbound, also from NLnet Labs, is a fast, lean recursive DNS server. So what does CoreDNS offer that these others don’t?
To begin with, CoreDNS is written in Go, and Go is a memory-safe programming language. Why is that important? Well, if you’ve ever run a BIND-based DNS infrastructure and had to upgrade 100 DNS servers ASAP because of a buffer overrun, you know. A healthy proportion of vulnerabilities in DNS servers of all stripes (at least those written in C and C++) stem from buffer overflows or overruns and dangling pointers. Written in memory-safe Go, CoreDNS isn’t subject to these.
Programs written in Go can also support concurrency, or parallel execution. This can be useful in wringing more performance out of multiprocessing or multitasking systems. BIND’s performance somewhat notoriously doesn’t scale well on multiprocessor systems, whereas CoreDNS’s performance scales nicely the more processors ...
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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.
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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.