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34758 discussions

RHEL 7.8 is out
by Phelps, Matthew 07 Apr '20

07 Apr '20

This is not your usual "so when is CO 7.8.xxxx coming out?" posts. I'm just curious if the CentOS team is affected by our current world conditions, or is work-from-home modus operandi for the team? (In other words, "when is CO 7.8.xxxx coming out?") -- *Matt Phelps* *Information Technology Specialist, Systems Administrator* (Computation Facility, Smithsonian Astrophysical Observatory) Center for Astrophysics | Harvard & Smithsonian 60 Garden Street | MS 39 | Cambridge, MA 02138 email: mphelps(a)cfa.harvard.edu cfa.harvard.edu | Facebook <http://cfa.harvard.edu/facebook> | Twitter <http://cfa.harvard.edu/twitter> | YouTube <http://cfa.harvard.edu/youtube> | Newsletter <http://cfa.harvard.edu/newsletter>

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firefox unable to load pkcs11 module
by Tony Schreiner 06 Apr '20

06 Apr '20

CentOS 7, In firefox -> privacy & security -> certificates -> security devices i am trying to load the pkcs11 modules, but get the error unable to load. I am following the directions at https://piv.idmanagement.gov/engineering/firefox/ I have installed opensc and openssl-pkcs11, which contains /usr/lib64/openssl/engines/pkcs11.so and am using that is the module Has anybody here done that, and can offer advice? Tony Schreiner

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C7, odd log off issue
by mark 06 Apr '20

06 Apr '20

Fresh C 7 install, fully updated... but whenever I go to log off, whether with ctl-alt-delete, or from the menu, instead of logging me off, it restart X, with me still logged on. The second time I try, it logs me off. Anyone seen this behavior? mark

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CentOS 8.1 cron does not send mail
by Tobias Kirchhofer 06 Apr '20

06 Apr '20

Hi, we experience difficulties with crond behaviour sending mail since CentOS 8.1. The cron job is the same like we used in CentOS 7. crontab -l /usr/bin/python3 -c 'import random; import time; time.sleep(random.random() * 3600)' && /usr/local/bin/backup.sh backup.sh writes the backup to the remote backup server. There are around 30 machines with the same cron job. The python part spreads the jobs over an hour so that the backup server is not struck at once from about 30 machines. The change in behaviour is that crond sends no mail anymore. It is because of the logical and (&&). Without this crond sends mails. What has changed in CentOS 8 and does anyone has an idea how we could fix it? Thank you! Tobias -- collect(a)shift.agency

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Windows 10 as guest on Centos 8
by Georgios 05 Apr '20

05 Apr '20

Hi there! Im trying to install windows 10 as a guest on Centos 8.1 I tried with cockpit and with boxes and both times my computer freezes during installation. Any ideas? Thanks in advance!

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Trying again: KDE fails with a gray screen after login, can't reinstall
by mark 04 Apr '20

04 Apr '20

I set for graphical mode, I get the login screen, I change to KDE, and the screen goes black, then after minutes, gray with a cursor, and that's it - I left it overnight, no change. Brand new install (as of yesterday). Missed any "agree to license", and missed choosing software. Manually groupinstalled Installed Environment Groups: KDE Plasma Workspaces Development and Creative Workstation Tried to reinstall: No group named KDE Plasma Workspaces exists I'm assuming I need to install something else, but does anyone have a clue? I really do NOT want gnome. mark

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Mostly better: new C7
by mark 04 Apr '20

04 Apr '20

Well, I gave up, and reinstalled C7. This time, I realized I needed to make a software choice before the install, and did so. My install, yesterday, was a minimal. Silly me, yesterday, after that, I did a groupinstall of KDE Plasma Workspaces... and it did *NOT* include all the dependencies to run KDE. Having installed a KDE desktop, much is better... with one exception: I can't seem to find any games. I tried yum groupinstall "Games and Entertainment", which showed when I did group list... and was told it was empty. Now what am I missing? I do have epel and rpmfusion, both free and non-free. mark

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Upgraded to 7.10 from 6...
by mark 03 Apr '20

03 Apr '20

Let me start out by making clear I *LOATHE* gnome, ok? So I don't want to hear about it. What's happening is this: I did this: yum groupinstall "Development and Creative Workstation" yum groupinstall "KDE Plasma Workspaces" Now, when I go in graphical mode, I try to change to kde on login. Nope - minutes later, I can see a cursor, and a gray screen. Ditto on the "safe mode", and ditto on "gnome classic". What have I missed? mark

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IOMMU and kernel
by Georgios 03 Apr '20

03 Apr '20

Hi. Im trying to set intel_iommu=on on kernel parameters at grub but for some reason it doesnt work. I edit /etc/default/grub file and i add the parameter. then i run grub2-mkconfig -o /boot/efi/EFI/centos/grub.cfg and then i reboot. when i run virt-host-validate i get QEMU: Checking if IOMMU is enabled by kernel: WARN (IOMMU appears to be disabled in kernel. Add intel_iommu=on to kernel cmdline arguments) when i edit the grub menu durring boot and i put intel_iommu=on and the i run again virt-host-validate i get QEMU: Checking if IOMMU is enabled by kernel: PASS any ideas? I tried editing other variables like GRUB_TIMEOUT and it seems to me that changes are applied. Thanks in advance

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C8 and backup solution
by Alessandro Baggi 03 Apr '20

03 Apr '20

Hi list, I'm searching a valid backup system to perform backups of 3 server, one local and 2 remote, and 2 linux workstation. (this number could be higher in future). Currently I'm testing bacula, scripted rsync with hardlink and borgbackup on C8.1. Bacula works without any problem, well tested, solid but complex to configure. Tested on a single server (with volumes on disk) and a full backup of 810gb (~150000 files) took 6,30 hours (too much). I would run deduplication but 1. bacula on C8 is not compiled with aligned 2. bacula put attention on some possibile bad scenario where deduplication could be a problem in losing one block that could break many files with the same shared block. So deduplication is secure or I should be away from it? scripted rsync. Simple, through ssh protocol and private key. No agent required on target. I use file level deduplication using hardlinks. To perform compression and block deduplication I could use fs like zfs (not available from epel) or use something like stratis (I don't checked if it offer deduplication in this moment). Encryption could be performed on fs level. Using a scripted rsync is the simpler way but there is something that could be leaved out by me (or undiscovered error). Simple to restore. BorgBackup is another solution similar to rsync in some way. It works like rsync through ssh but while rsync simply sends data, borg run deduplication, compression and encryption on place. Why is similar rsync? Because I need another script to run borg. It is not a complete solution and it works on push method and not pull like with bacula or rsync. If I would manage all my server from a central backup server is a problem, so to accomplish this I should run the borg command from the central server on the target server that point back to the remote repository (located on the central server). There is another solution with borg: using sshfs but is 4 time slower (too much solwer). I have not so much experiences on backups and choosing the bad tool could be dangerous so I need some suggestion. What backup solution do you suggest for my scenario? Thank you in advance. Alessandro.

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