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Ok, this question comes about because I noticed that I manually have |
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to set $mydomain in Postfix. I'm about to set up Samba, too, and |
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thinking that I might have to manually set the domain name in that, |
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too, I thought to investigate this. Surely Postfix should get its |
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hostname & domainname from the system itself, right? |
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|
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$ hostname |
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hex |
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$ dnsdomainname |
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stroller.uk.eu.org |
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$ domainname |
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(none) |
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$ domainname -v |
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getdomainname()=`(none)' |
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(none) |
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$ |
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|
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This mention of getdomainname agrees with the comments in Postfix's |
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main.cf: |
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|
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# The myhostname parameter specifies the internet hostname of this |
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# mail system. The default is to use the fully-qualified domain name |
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# from gethostname(). $myhostname is used as a default value for many |
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# other configuration parameters. |
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|
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`man domainname` tells me that `domainname` should in particular "show |
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or set the system's NIS/YP domain name". |
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|
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Can anyone explain the significance of this, please? |
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|
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/etc/conf.d/net.example suggests that "it's rare that you would need |
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to" set a NIS domainname, "but you can anyway", and the Gentoo Linux |
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x86 Handbook [1] says "if you don't know what [a NIS domain] is, then |
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you don't have one". |
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|
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I guess that a typical desktop system might use ssmtp and not need |
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either postfix or a NIS domainname, however I'm still confused. I |
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guess the best question I can ask is why Postfix might choose to use |
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this apparently-less-common config to set its hostname? I really feel |
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like I must be missing out. It's not a massive hardship to set |
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$mydomain manually in Postfix on several boxes, it just seems like I |
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ideally shouldn't have to. Is there anyone who can help clarify for me? |
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|
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Many thanks in advance for all suggestions, |
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|
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Stroller. |
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|
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[1] http://www.gentoo.org/doc/en/handbook/handbook-x86.xml?part=1&chap=8#doc_chap2 |