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Linux DNS settings is a total mess
(lemdro.id)
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Linux is a family of open source Unix-like operating systems based on the Linux kernel, an operating system kernel first released on September 17, 1991 by Linus Torvalds. Linux is typically packaged in a Linux distribution (or distro for short).
Distributions include the Linux kernel and supporting system software and libraries, many of which are provided by the GNU Project. Many Linux distributions use the word "Linux" in their name, but the Free Software Foundation uses the name GNU/Linux to emphasize the importance of GNU software, causing some controversy.
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Slightly off topic, but as long as we're ranting about DNS...
Proxmox handles DNS for each container as a setting in the hypervisor. It's not a bad way of simplifying things, but if, hypothetically, you didn't know about that, then you could find yourself in a situation where you spend an entire afternoon trying every single one of the million different ways to edit DNS in Linux and getting increasingly frustrated because the IP gets overwritten every time you restart the container no matter what you do, until eventually you figure out that the solution is just like three clicks and a text entry box in the Proxmox GUI!
...Hypothetically, of course.
Wait, what? LOL didn’t know Proxmox had that!
Thanks, you’ve saved me from spending some afternoons. I don’t want to think about how much time I spent on DNS before this
RTFM
https://pve.proxmox.com/wiki/Linux_Container#_guest_operating_system_configuration