[CentOS] hostname setting

MrKiwi mrkiwi at gmail.com
Wed Nov 29 21:34:48 UTC 2006


Can someone with far more knowledge than me help here?

I have a co-worker with a question;
"
Where should i set the server's hostname?
There seems to be multiple places and i don't understand the 
differences.
1. # hostname mailserver.mydomain.com
2. # echo "127.0.0.1 mailserver 
mailserver.mydomain.com">>/etc/hosts
3. # vi /etc/sysconfig/network, add 
"HOSTNAME=mailserver.mydomain.com"

So far i think i understand that postfix likes to see the 
hostname in the hosts file, but things i have read imply 
that postfix is pretty clever at working it out from 
multiple places.
Apache also seems to be clever, but the conf file recommends 
that you hard code the server name into the config. If you 
don't, where does apache look?
If you set the hostname during an install, where is that 
written?
If i use method 1 above ("hostname mailserver.mydomain.com") 
i seem to have to do that at every boot (or script it of 
course) whereas the edit to /etc/hosts or 
/etc/sysconfig/network would survive restarts.

I have read the information in "man hostname" and understand 
that "hostname -f" gets its info from the hosts file, but 
where does the function "gethostname" get its info from?

Finally - which method do you all use to set you hostname?
"

Thanks all,

MrKiwi



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