Qlustar General

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August 2021

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2 discussions

[Qlustar-General] Node Replacement Issue - Infinite DNSMasq Lease in /var/lib/misc/dnsmasq.leases
by hereiam＠mit.edu 25 Nov '21

25 Nov '21

Hi everyone, I've run into what may be an uncommon issue when replacing nodes in Qluman. Say I have a node all configured, then I completely remove that machine and replace it with a new one (may or may not be different specs). I have noticed that Qluman allows one to make the new node in the configs, but it never boots Qlustar. I also found the fix - the file /var/lib/misc/dnsmasq.leases doesn't appear to get updated *only when deleting a node.* Adding new nodes works perfectly, as does changing MAC addresses. However, I've had to go in and manually delete the corresponding entries from the file on the headnode, after which Qluman works perfectly adding a New Host with the old IP address. Can anyone else reproduce this issue, and if so, would an addition to the scripts to the tune of deleting the line matching the hostname or MAC address in /var/lib/misc/dnsmasq.leases be required for the next round of updates? It makes sense that leases should have infinite lifetime in a cluster (nodes should sit tight for years), though in this rare situation it requires a bit of extra manual tweaking. Thanks, -Mike

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Difficulties installing Qlustar 12 on HP server
by david.whipp＠helsinki.fi 03 Aug '21

03 Aug '21

Hi, I have an HP Proliant DL380p (gen8) server that has been used as our head node for a Qlustar 10 cluster for several years now. We've recently decided to upgrade to Qlustar 12 (via a clean install) and I have been having issues with the installer not being able to find a disk for the installation. When I boot from USB the installer starts as expected, but once it loads I receive the message "No disks found - The installer ha not found any unused disks, installation cannot continue.". I've done some googling and found a few similar issues, mostly related to RAID, but no solution yet. The server does have a hardware RAID disk controller (HP P420i) and the target disk is a RAID 1 logical volume. The odd thing is that dropping into a shell and using lsblk shows the target RAID volume and another on the same controller as /dev/sda1 and /dev/sdb1. The RAID partitions also appear in the output of `cat /dev/partitions`, and it appears that the hpsa module has loaded properly from the output of `lsmod | grep hpsa`. We've today updated the BIOS and RAID controller firmware on the server and are still having no luck with proceeding with the install (same error every time). I am tempted to test things with the installer for Qlustar 11, but it no longer appears to be available online. Any suggestions? Thanks! Dave p.s. I won't be able to have physical access to the cluster again until July 20, but can try to answer any questions that come up here in the meantime.

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