domainname command shows blank - NIS/YP domain name?
On Wed, 13 Jan 2010 02:22:47 +0000, Stroller
> Ok, this question comes about because I noticed that I manually have
> to set $mydomain in Postfix. I'm about to set up Samba, too, and
> thinking that I might have to manually set the domain name in that,
> too, I thought to investigate this. Surely Postfix should get its
> hostname & domainname from the system itself, right?
> $ hostname
> $ dnsdomainname
> $ domainname
> $ domainname -v
> This mention of getdomainname agrees with the comments in Postfix's
> # The myhostname parameter specifies the internet hostname of this
> # mail system. The default is to use the fully-qualified domain name
> # from gethostname(). $myhostname is used as a default value for many
> # other configuration parameters.
> `man domainname` tells me that `domainname` should in particular "show
> or set the system's NIS/YP domain name".
> Can anyone explain the significance of this, please?
> /etc/conf.d/net.example suggests that "it's rare that you would need
> to" set a NIS domainname, "but you can anyway", and the Gentoo Linux
> x86 Handbook  says "if you don't know what [a NIS domain] is, then
> you don't have one".
> I guess that a typical desktop system might use ssmtp and not need
> either postfix or a NIS domainname, however I'm still confused. I
> guess the best question I can ask is why Postfix might choose to use
> this apparently-less-common config to set its hostname? I really feel
> like I must be missing out. It's not a massive hardship to set
> $mydomain manually in Postfix on several boxes, it just seems like I
> ideally shouldn't have to. Is there anyone who can help clarify for me?
The only way found for me was echo the domainname on startup onto proc
echo domainname.ch > /proc/sys/kernel/domainname
Does that work for you too ?