Qlustar General July 2024

qlustar-general@qlustar.org

6 participants
7 discussions

Re: qlustar-general@qlustar.org post from praveen@aukcomputing.com requires approval
by Roland Fehrenbacher 31 Jul '24

31 Jul '24

On 7/24/24 14:37, Praveen Fernando wrote: > After the re-installation, I received the server, and I completed the > one-node installation, which is also operating properly. OK, very good. > How to sync with Slurm user During creating user, I can't see the > Slurm group management in the user creation page, thus I have to > enable anything or some configuration settings. Please consult the subsection 'LDAP Sync Groups' at https://docs.qlustar.com/Qlustar/13/ClusterOS/qluman-guide/components/slurm… > I need some additional help, like installing pbs in that cluster. > Could you please give the specifics if you have? Qlustar does not support PBS. Best, Roland

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Problem, and Potential Long-Term Solution, when Replacing Nodes Related to dnsmasq.leases
by hereiam＠mit.edu 30 Jul '24

30 Jul '24

Dear Qlustar Users, I'm running what I think may be the world's worst supercomputer (for fun), composed entirely of different spec laptops. This was a pandemic project gone amok, just to see what is possible. I've used the opportunity to figure out how to do some strange things, one of which includes replacing nodes quickly and frequently on a Qlustar-based system, as laptops fail fairly often when used as HPCs. The Problem: When deleting a host from Qluman (13.6.0, and many previous versions), and trying to assign a new physical machine to the exact same hostname (an attempt at drop-in replacement), it never acquired a DHCP license. Everything looked good from Qluman's side, but the new node would never get a DHCP license to start loading/booting Qlustar. It would, however, after restarting the head node. I'd rather not do that after every drop-in replacement. The Solution: I found that each host has an entry in /var/lib/misc/dnsmasq.leases which blocks Qluman and such from truly assigning it as a new hosts. If instead I first delete that entry from dnsmasq.leases, restart the dnsmasq service by typing 'service dnsmasq restart,' and also rewrite the Slurm Config file (causing the slurmctl service to also restart), it works! The Request: Could the Qlustar mods please consider a line in the "Delete Hosts" menu option in the Enclosure Vire of Qluman's scripts, which greps dnsmasq.leases for any line with that host name and deletes it, and restarts the dnsmasq service? I think that would do the trick, but I may be mistaken. Happy to discuss more if you'd all like! Sincerely, -Mike

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Need a help
by Praveen Fernando 24 Jul '24

24 Jul '24

Hi team, After installation, attempting to create the key results in the following error. can you help me qluman-cli --gencert ERROR:client.cli.network:client.cli.network.Cluster.__init__(): could not connect to server Error: No such user: 'admin' ERROR:qlunet.Channel:Channel[(b'qluman-cli', 1)].do_recv(): exception in request generator Traceback (most recent call last): File "/usr/lib/python3/dist-packages/qluman-13/qluman-cli.py", line 1546, in gencert db.users.lookup(field="name", val=user) File "/usr/lib/python3/dist-packages/qluman-13/common/types.py", line 2216, in lookup raise KeyError("{0}={1}".format(field, val)) KeyError: 'name=admin' During handling of the above exception, another exception occurred: Traceback (most recent call last): File "/usr/lib/python3/dist-packages/qlunet/Channel.py", line 88, in do_recv args = next(self._generator) File "/usr/lib/python3/dist-packages/qluman-13/qluman-cli.py", line 1549, in gencert sys.exit(1) SystemExit: 1 how to create the User admin ? Regards DISCLAIMER: The information contained in this email is confidential and may be legally privileged. It is intended solely for the addressee and access by anyone else is unauthorized you are not the intended recipient, any disclosure, copying, distribution or any action taken or omitted to be taken in reliance on it, is prohibited and may be unlawful. When addressed to our customers, any information contained in this e-mail is subject to our standard terms and conditions. The views in this email may not necessarily reflect the views of the company.

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Spack 0.22.0 problem with zlib-api
by tiagomeloalmeida＠ua.pt 22 Jul '24

22 Jul '24

Dear Qlustar Team, I apologise if this isn't the appropriate channel for such report. If there's a better place to direct this question, please let me know. I believe I've encountered a bug with the recent update of Spack in the Qlustar HPC Core Stack 24.06. After upgrading my Qlustar system (both chroot and head-node, using 'apt update' followed by 'apt upgrade'), I started receiving the following error when attempting to install packages with Spack: ==> Error: Package 'spack.pkg.builtin.zlib-api' not found. Use 'spack create' to create a new package. Did you mean one of the following packages? libkcapi grib-api libcap Upon investigation, I found a relevant change in Spack itself: https://github.com/spack/spack/commit/e51748ee8f89e0d3db4e426e3d04157129a45… This change introduces a new virtual 'zlib-api', which replaces 'zlib' in most packages to allow users to switch to zlib-ng by default for better performance. However, I noticed that the /etc/spack/defaults/package.json file was missing the definition of this virtual library. I added the line "zlib-api": ["zlib", "zlib-ng+compat"] to the file, but I'm still encountering the same error. What am I missing? How can I resolve this issue? For reproducibility purposes: - Spack version: 0.22.0 (previous version before the update 0.20) - Command I'm running: spack install r Furthermore, I believe this would affect most of the installation packages in Spack, since zlib is used in alot of them. Thank you for your assistance. Best regards, Tiago Almeida

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Re: qluman-cli --gencert and qlumand-apt-trigger errors
by Gaviri, Cyrus 10 Jul '24

10 Jul '24

Hi Roland, Thanks for replying. I have attached my installsettings. Best, Cyrus

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qluman-cli --gencert and qlumand-apt-trigger errors
by c.gaviri＠lancaster.ac.uk 09 Jul '24

09 Jul '24

Hi, I'm trying to do a fresh install using 13.2-1 (Ubuntu) and noticed this error during the initial config; qlumand-apt-trigger: timeout the instal then finishes but when I try qluman-cli --gencert --debug All I get is; Error: Could not connect to server. I found in the logs it suggested slurmd was not running, but even after manually starting qluman-slurmd it gives the same error. Any ideas/suggestions? Thanks, Cyrus

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Security/Bug fix release 13.2.0.0
by no-reply-list＠qlustar.org 01 Jul '24

01 Jul '24

The Qlustar release 13.2.0.0 is ready including a fix for the recently discovered ssh RegreSSHion bug. Please check the following web page for more details: https://qlustar.com/qsa/2024/0701241

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Qlustar General July 2024