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Re: hostname?

ghe wrote: 
> On 10/4/19 1:36 PM, Dan Ritter wrote:
> root@pix:~# cat /etc/hostname
> sbox

This is good.

> > /etc/hosts
> root@pix:~# cat /etc/hosts


>	localhost.localdomain		localhost lh lcl

this is fine. Some mechanisms like to pick up a non-localhost
name in 127/8 and pretend it's the hostname.

> > the output of
> > 
> > hostname -f
> root@pix:~# hostname -f
> hostname: Name or service not known


> > hostnamectl
> root@pix:~# hostnamectl
>    Static hostname: sbox
> Transient hostname: pix
>          Icon name: computer-desktop
>            Chassis: desktop
>         Machine ID: d01c1f97efc944bd81768d849446feaf
>            Boot ID: 50e006fce53c47a881b78f09c0bbcbe2
>   Operating System: Debian GNU/Linux 10 (buster)
>             Kernel: Linux 4.19.0-6-amd64
>       Architecture: x86-64
> Hmm. That's interesting. Transient hostname. I didn't know of
> hostnamectl. Tells what it is, but not what to do about it or where it
> came from.

Righto. systemd strikes again. Here's the relevant man page

hostnamectl may be used to query and change the system hostname
and related settings.

This tool distinguishes three different hostnames: the
high-level "pretty" hostname which might include all kinds of
special characters (e.g. "Lennart's Laptop"), the static
hostname which is used to initialize the kernel hostname at boot
(e.g. "lennarts-laptop"), and the transient hostname which is a
fallback value received from network configuration. If a static
hostname is set, and is valid (something other than localhost),
then the transient hostname is not used.


In this case, systemd has helpfully decided that a name it is
picking up from DHCP (most likely) is your system's temporary
name. I'm not sure why anyone thought this was a good idea, but
that's what it is.

You can probably tell your dhcp client not to ask for the
temporary/transient hostname, or tell systemd not to do this
thing, but I don't know precisely how.


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