[Spacewalk-list] kickstart, cobbler and hostnames

[Daniel Eather]

Admittedly I’ve not read all the things you’ve tried, but there was a post by Emmett a few days back about assigning a random hostname on build. It may help?



From: spacewalk-list-bounces at redhat.com [mailto:spacewalk-list-bounces at redhat.com] On Behalf Of Emmett Hogan
Sent: Saturday, 5 March 2016 3:20 AM
To: spacewalk-list at redhat.com
Subject: Re: [Spacewalk-list] Set Random Hostname During Build process (SOLUTION)

Well…I never got a response from the list (or the IRC Channel) on this, but it turns out the solution is WAY easier than I thought, but not very intuitive.

I simply put this line in as a “PRE” bash script:

echo "network --hostname=temp-$RANDOM$RANDOM.mydomain.com" > /tmp/pre-hostname

Then put the line:

%include /tmp/pre-hostname

into the “Custom Options” box at the bottom of the “Kickstart Details” -> “Advanced Options” page for your kickstart profile.

Hopefully this will save time for other folks.

-Emmett

From: spacewalk-list-bounces at redhat.com [mailto:spacewalk-list-bounces at redhat.com] On Behalf Of Lachlan Musicman
Sent: Wednesday, 23 March 2016 3:08 PM
To: spacewalk-list at redhat.com
Subject: [Spacewalk-list] kickstart, cobbler and hostnames

Hola,
I've found a number of ideas online about how to inject the hostname into a kickstart'ed installation, but I'm still unable to get a server to boot using a hostname that isn't generic.  I don't have admin access to the DNS or DHCP server, so I can't use either of those.
I have tried a post install script, but that failed to change the hostname.

There is the pre-script pass as kernel parameter option, which I don't like much

http://monzell.com/post/15547967527/automatically-set-the-hostname-during-kickstart

and the network config line which I'm also ambivalent on:

http://forums.fedoraforum.org/showthread.php?t=285238
given that I want dynamic names (if I launch 20 servers from the same profile, I want them to have unique hostnames that aren't localhost.localdomain). Neither of these systems is dynamic enough for this, unless I'm missing something?

I found this email:

https://www.redhat.com/archives/spacewalk-list/2015-July/msg00054.html
which lead me to "3.1.4.6. Adding a System to Cobbler" here https://access.redhat.com/documentation/en-US/Red_Hat_Satellite/5.6/html/Getting_Started_Guide/chap-Getting_Started_Guide-System_Provisioning.html

I created a pool of MAC addresses and then added them as cobbler systems, I regenerated the generated.iso - but the systems that are booting aren't getting the "cobbler system" that was created for each of them?
I'm not 100% sure at which point the "cobbler system" should be taking control - I'm still getting a boot menu with a list of KS profiles to choose from, despite each cobbler system being associated with a ks profile...
What am I doing wrong or not understanding wrt cobbler systems? Is it because my NICs are vNICS and therefore the MAC addresses are ...?
If, alternatively, I was to do something in a %post, like this

%post --nochroot

echo $hostname > /mnt/sysimage/home/hostname
(as found here:

http://serverfault.com/questions/608544/passing-variables-in-kickstart )

I presume I could apply hostnames depending on the MAC address, which presumably I can get in %post via # ifconfig | grep ether | awk '{print $2}' or somesuch





Cheers
L.




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The most dangerous phrase in the language is, "We've always done it this way."

- Grace Hopper

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