HOSTNAME in nfsroot boot is FQDN
Justin Cattle
j at ocado.com
Thu Jun 8 22:52:15 CEST 2017
Found an old thread on this as well:
https://lists.uni-koeln.de/pipermail/linux-fai/2014-April/010368.html
I really cant believe Dracut has this - I may create an issue on github,
see what they are saying..
Cheers,
Just
On 8 June 2017 at 21:46, Justin Cattle <j at ocado.com> wrote:
> Aha - it is dracut - I've just found this!
>
> https://bugzilla.redhat.com/attachment.cgi?id=535417&action=diff
>
> Disappointing - hostnames with with a "." aren't even valid are they ?
>
>
>
>
> Cheers,
> Just
>
> On 8 June 2017 at 21:43, Justin Cattle <j at ocado.com> wrote:
>
>> Thanks for the input John.
>> Glad to here it's not just me :)
>>
>>
>> I could implement some workarounds in the various scripts, that's true.
>>
>>
>> I've been doing some digging, and although I don't have the real answer
>> yet, I don't believe it's a FAI problem as such, it's something about the
>> NFSROOT OS. In my case, debian stretch.
>>
>> This script does get the correct info from DHCP:
>>
>> /usr/share/fai/dhclient-fai-script
>>
>>
>> If you change the content to log to a file:
>>
>>
>> perl /usr/lib/fai/dhclient-perl >/tmp/foo 2>&1
>>
>>
>> The file contains the correct HOSTNAME value.
>>
>>
>> Likewise, if you change the perl script itself:
>>
>> --- dhclient-perl 2017-06-08 14:06:00.857442761 +0100
>> +++ usr/lib/fai/dhclient-perl 2017-06-08 16:28:03.015219588 +0100
>> @@ -29,7 +29,7 @@
>> # map dhcp names to bootp names
>> %names = qw/
>> ip_address IPADDR
>> - host_name HOSTNAME
>> + host_name FAI_HOSTNAME
>>
>>
>> The variable FAI_HOSTNAME appears with the correct short name you would
>> expect to find in HOSTNAME.
>>
>> This makes me to think that something else is setting the HOSTNAME
>> varialbe in the environment, and that the FAI scripts don't then override
>> that.
>>
>> That part might be handled by the perl script, but my perl is
>> non-existent, and I don't really know if that's the case.
>>
>>
>> If that is all true, the question is what is setting the HOSTNAME
>> variable. I've tried disabling /etc/init.d/hostname.sh, and
>> lib/systemd/system/systemd-hostnamed.service, but it doesn't seem to
>> help. Maybe something else in systemd, or even dracut. But I can't find
>> it...
>>
>> In fact, just been looking some more, and the hostname is set before
>> /usr/sbin/fai runs , /proc/sys/kernel/hostname is set , so maybe it is
>> dracut?
>>
>>
>> I'd really like to get to the bottom of this before I implement
>> workarounds.
>>
>>
>>
>>
>> Cheers,
>> Just
>>
>> On 8 June 2017 at 17:30, John G Heim <jheim at math.wisc.edu> wrote:
>>
>>> I posted about this problem approximately a year ago. I poked around in
>>> the source code a little but finally just made a workaround by adding a
>>> line to my class script:
>>>
>>> echo "${HOSTNAME}" | sed s/\.math\.wisc\.edu//
>>>
>>> So you end up with classes for both the fqdn and the hostname. The only
>>> problem with that seems to be that logs are created in /var/log/fai/<fqdn>/
>>> instead of /var/logs/fai/<hostname>/.
>>>
>>> I am a little surprised you're getting this in 5.3.6. I was running
>>> 5.0.3 when I had the problem. I create a whole new FAI setup for 5.3.6 and
>>> I don't have the problem any more. Are you using 5.3.6 in the nfsroot? I'm
>>> not sure how FAI installs FAI itself inside the nfsroot but you might be
>>> running an older version there. I am also installing ubuntu zesty instead
>>> of xenial but I don't see how that could matter.
>>>
>>>
>>>
>>> On 06/08/2017 04:40 AM, Justin Cattle wrote:
>>>
>>>> Hi,
>>>>
>>>>
>>>> I've been testing migrating to fai 5 from 4.
>>>> I'm currently using fai-5.3.6, on Ubuntu xenial, but with a Debian
>>>> stretch nfsroot [ due to lack of dracut support in ubuntu ].
>>>>
>>>> When I build a host, the boot all works ok and the build process starts
>>>> fine.
>>>> However, the hostname of the instance is somehow getting set to the
>>>> FQDN.
>>>>
>>>> It sounds like a small problem, but has a knock on effect on some of
>>>> our custom class assignment scripts.
>>>>
>>>> I know that dhcp is sending the correct host-name.
>>>>
>>>>
>>>> It looks like FAI set's the HOSTNAME variable from this script passed
>>>> from dhclient:
>>>>
>>>> root 1531 0.0 0.0 21484 1076 ? Ss 10:21 0:00
>>>> dhclient -lf /dev/null -cf /usr/share/fai/dhclient-fai.conf -sf
>>>> /usr/share/fai/dhclient-fai-script eth0
>>>>
>>>>
>>>> Am I right in thinking that?
>>>>
>>>> Any ideas on how I can fix or debug this so HOSTNAME is set to the
>>>> host-name requested from DHCP?
>>>>
>>>> It's not even obvious to me where the dhcp config for fai that calls
>>>> that script is set.
>>>>
>>>>
>>>> Any help or info is greatly appreciated.
>>>> Thanks!
>>>>
>>>>
>>>>
>>>> Cheers,
>>>> Just
>>>>
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Fetch and Sizzle are trading names of Speciality Stores Limited and Fabled
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