Figuring Out Name Resolution! (Linux+ Objective 1.5.2)

Linux comes with tools like dig, nslookup, hostnamectl, resolvectl, etc. Several of them do similar tasks, but it's important to understand what they're actually doing, and how DNS queries are executed on a system.
We learn about nsswitch.conf, resolv.conf, /etc/hosts, and how they all work together. The joke in IT is that problems are "always DNS" -- so it's important to understand how it works!
This video will be helpful if you're also doing our Weekend Assignments. Weekend Assignment #19 (snar.co/wa19) is what we'll cover this Sunday on our livestream. If that's already passed, check out our playlist of solutions: snar.co/solutions
The CompTIA Linux+ objectives are available here: snar.co/plusobjectives
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#Linux #CompTIA #XK0_005 #dns #nsswitch #resolv.conf #nslookup #network #networking #certification

[@PS_Tube]

The most comprehensive Linux tutorials on KZbin. 👏👏 Thank you Mr Powers.

[@Thomas_Grusz]

Love your practical, no-nonsense tutorials. Your experience as a pro helps me to cut through the noise.

[@inteliconn995]

Thanks!

[@RikCarton]

Very insightful, thank you! The tools you show may just help me solve a WireGuard problem, or at least provide some more information!

[@chunhoochun]

Thank you, Shawn!

[@dariusvlogs3634]

Looking forwsrd for you to cover the security section!

[@cesar8197]

wonderful! DNS in linux is kind of a blurry mess. Thanks :)

[@user-ox8dh8re9r]

Hello Shawn, I have a question that is not related to this video. I've been trying to figure out how USB devices automatically mount to the media directory. Is there a systemd unit file or udev rule that says all USB devices will be automatically mounted to /media? Appreciate your help. Thanks.

[@zur4203]

resolvctl is not working. I tried it on RHEL7.9 and 2 debian based distros(not ubuntu). what is the alternative now?

[@DrMerciless]

I have used the pretty hostname as a description field a few times. Is that bad practice?

[@Dedseq]

Hey Shawn! Thanks for the refresher. very straight to the point, with no big words in the explanation. 🤌💋 chef kiss