Hi Thomas,
The initrd-stateless.gz is created by genimage. Since you are
generating diskless images for centos, you can look at this file:
/opt/xcat/share/xcat/netboot/centos/genimage. Around line 1628
system("cp -r $rootimg_dir/etc/init.d/*
/tmp/xcatinitrd.$$/etc/init.d");
Ling
From: Thomas Orgis <[email protected]>
To: [email protected]
Date: 06/29/2015 11:30 AM
Subject: [xcat-user] squashfs on CentOS 7
Hi,
I'm working on getting a cluster with xCAT 2.9.1 and CentOS 7.1 ready.
There is a basic installation, but there is one blunt reason why the
default packaging of stateless rootimgs with cpio is not working for us:
We live in a world with more accounts than 16 bit can accomodate.
Hence, there are system-relevant accounts with UIDs high up in the 32
bit range to avoid conflict with ID ranges for ordinary users (managed
by a directory service).
This means that cpio has trouble packing up the thing. My first guess
about it not handling 32 bit UIDs wasn't the point, actually, but this
was:
cpio: var/log/lastlog: field width not sufficient for storing file size
Funny, eh? var/log/lastlog is a sparse file of 51 GiB because of some
large UIDs.
Now, I was able to fix that by
ln -sf /dev/null var/log/lastlog
, probably a sensible move in any case, but actually I would really
would like to be able that one alternative to cpio that there is in
xCAT: squashfs. That would free up about half the RAM the rootfs needs,
perhaps more when using xz compression (one step after another).
That is not supported on CentOS right now, as it seems, but I fail to
see a strong reason.
The trouble is that, on boot, the initrd tries to mount squashfs
with an aufs overlay. Aufs is not present anymore, but overlayfs is
(just modprobe overlay, it's already in the initrd).
So, I figure that I just need to modify some lines in a script to mount
overlayfs instead of aufs. I'm not yet clear about which part of xCAT
or simply the CentOS host creates initrd-stateless.gz. I guess I could
"postprocess" that for now, but I'd like to have packimage (or
genimage) do it properly.
Where should I properly edit the code to work with squashfs+overlayfs?
Regards,
Thomas
--
Dr. Thomas Orgis
Universität Hamburg
RRZ / Zentrale Dienste / HPC
Schlüterstr. 70
20146 Hamburg
Tel.: 040/42838 8826
Fax: 040/428 38 6270
[attachment "smime.p7s" deleted by Ling Gao/Poughkeepsie/IBM]
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