Linux Working Group



Meeting Date

  • TEAMS: 2021-11-18

Invitees - Attendees

  • ldpaniak, a2brenna, lfolland, dlgawley, nfish, fhgunn, omnafees, gxshen, tlichty, dmerner, ctucker

Review and accept previous meeting minutes.

  • Accepted

Proposed Agenda Items

Old Business

Reschedule this meeting

* 10:30 Wednesday alt saltstack meeting

Moving remaining data from NetApp to DFSc

Model is data moves to /srv/DFSc//{home,mail,region}

  • In General
    • Any progress on moving Dan Berry's /opt/csw? * RSG discuss moving to jerusalem directly * Configure an NFS share via gateways: lfolland will create ticket for ctucker

    • Any word from Isaac about use of Nettap for storing web logs? Ticket (a2brenna) for ijmorlan

  • TEACHING - Progress reports on
    • old home directory snapshots on NetApp: Keep older than 16 months? a2brenna discuss with yc2lee
    • xhier regional trees: Destinations exist on DFSC.

  • CS-GENERAL - Progress reports on
    • xhier regional trees
  • Are we still on track for moving mail in December?
    • lfolland sent notification for move CS maill to IST on 2021-11-24
      • Do not move mail homes to DFSC until after move to IST
      • lfolland to discuss with sdinney

CS Teaching - slowness of systems - how to address? (All)

  • Ceph:
    • New 420 systems online? Yes. Old MDS retired
    • Gateway systems (NFS/Samba) upgraded? block old client?
    • Client kernel updates (that includes CEPH patch): Looks like latest 5.11 contains relevant patch (a2brenna). Will need to test on 000/100 systems
  • cgroup limiting of memory usage
    • Seems to be working as expected (a2brenna)
    • lfolland: Any improvement? Memory exhaustion problem solved. Still working MDS/cap recall issues
    • Report reboots/changes to production state in CSCF Teams Changes channel. In particular ubuntu2004-008 rebooted. Why?

Hosts for production DB (postgres) containers? (Lori and Nathan)

Interested in hosts with ~1TB of NVMe for DB storage, access to cephfs for backups
  • review where we have suitable disk space that can be repurposed as xfs volume for this service: a2brenna No systems available with that storage
  • Possibly recover 960GB Optane cards from 422 systems (ldpaniak)?

Changes to Regions:

  • OpenEdx has requested modest increase in disk space for test environment. Not a problem.

Management of portable devices

* dmerner: Apple devices locked to UW. Management of CSCF-provided devices

BUMPED from last meeting

Review new pam stack setup and files. (Dave and Clayton) DONE

  • deployment of /etc/ssh/sshd_config, /etc/pam.d/sshd, /usr/share/doc/pam-kerberos-yubikey-duo-message.txt, /usr/local/bin/pam_exec-internal_ip_test.sh script
  • after the deployment of above file, need to run "systemctl reload ssh"

New business

Storage option catalogue:

* NFS, Samba, S3, RBD, posix, web, Nextcloud: ticket for ldpaniak/gxshen to create list

OdysseyDB backup volume (s8weber) on DFSC

* nfish: only a temp requirement

Dell firmware updates on iDRAC9 went smoothly

Limits to number of processes on CS-GENERAL systems?

    • Look into it and report back

Networking extension (dlgawley): https://cs.uwaterloo.ca/cscf/internal/infrastructure/services/network/ServerRooms/proposed/

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Topic revision: r3 - 2021-11-18 - LoriPaniak
 
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