On Tue, Sep 22, 2009 at 08:40:51AM -0400, Tom Horsley wrote:
> On Tue, 22 Sep 2009 08:31:09 -0400
> Robert Moskowitz wrote:
>
> > What can be done to get 'hostname' to always figure out to return the
> > FQDN if one exists?
>
> I always thought it returned whatever was set as HOSTNAME=
> in the /etc/sysconfig/network file.
Not exactly. Here is a code used by a network configuration
if need_hostname; then
IPADDR=$(LANG=C ip -o -4 addr ls dev ${DEVICE} | awk '{ print $4 ; exit }')
eval $(/bin/ipcalc --silent --hostname ${IPADDR} ; echo "status=$?")
if [ "$status" = "0" ]; then
set_hostname $HOSTNAME
fi
fi
where need_hostname function looks like that:
need_hostname ()
{
CHECK_HOSTNAME=`hostname`
if [ "$CHECK_HOSTNAME" = "(none)" -o "$CHECK_HOSTNAME" = "localhost" -o \
"$CHECK_HOSTNAME" = "localhost.localdomain" ]; then
return 0
else
return 1
fi
}
So if you are assigning addresses to interfaces dynamically and
ipcalc can get hostname like the above then names will correspond to
addresses. There is a bit more of "sanity checks" elsewhere but
these are main parts.
Last time I tried NetworkManager was incapable of doing things of
that sort so you had to use 'network' service to get such effects.
Michal
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