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Manual partitioning and LVM
by Kenneth Porter 20 Oct '19

20 Oct '19

I can't seem to figure out how to partition for install. I've tried both CentOS 8 and 7.7 netinstalls. I've got 3 disks: sda (big hardware RAID array), sdb (SSD), and sdc (internal SD card for booting). I want to put /boot on sdc, /usr on sdb, and / on sda. I don't care what format is used on sdb and sdc, whatever will let it boot. I want LVM on sda so that I can use snapshotting for backups. I can pre-format sdb1 and sdc1 as ext4 usinga gparted live DVD. If I select manual partitioning, I can then label and assign those two to /usr and /boot. I can see sda in the drives available on the first detination screen but but I don't see it in the manual partitioning screen. So I don't see how to partition and format it as an LVM volume that I can mount to /.

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KVM hypervisor displaying "vcpu0, guest rIP: 0xffffffff8225bc98 disabled perfctr wrmsr: 0xc2 data 0xfff"
by Carlos Lopez 19 Oct '19

19 Oct '19

Hi all, I have installed a CentOS-8 server to accomplish some tests using kvm guests … All these guests are centos8 also. When these guests starts, I always see errors like: [ 589.687915] kvm [2133]: vcpu0, guest rIP: 0xffffffff81a5bc98 disabled perfctr wrmsr: 0xc2 data 0xffff [ 596.210773] kvm [2201]: vcpu0, guest rIP: 0xffffffffb885bc98 disabled perfctr wrmsr: 0xc2 data 0xffff Is this a bug? I am not using virt-manager to create guests configuration … Any idea? Kernel release is: 4.18.0-80.11.2 -- Regards, C. L. Martinez

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Custom LiveCD images with CentOS8
by Leon Fauster 19 Oct '19

19 Oct '19

Is it at this moment possible to build custom LiveCD images? Are they all necessary tools available in CentOS8? I have never done this and wonder if it is still possible for C8. C7 stuff seems to be here: https://github.com/CentOS/sig-core-livemedia Not quite sure if Fedora howtos can be applied here. Any hints? Thanks, Leon

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CentOS 8 Libvirt /qemu
by Günther J. Niederwimmer 18 Oct '19

18 Oct '19

Hello, can any install more then one KVM Client with UEFI ?? On my system it is not possible; I have total crash on the system, when I install a client with UEFI after Install one UEFI System, it is only possible to install a KVM client without UEFI this is working?? I found so match broken things, so I mean the best situation is to go back to 7.7 :-(. Is in the near time a situation to found updates for centos 8? -- mit freundlichen Grüßen / best regards Günther J. Niederwimmer

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CentOS 8 Docker container is missing dnf-plugin-ovl
by Richard Berger 18 Oct '19

18 Oct '19

Hi everyone, I've been running some tests on Travis CI with CentOS 7 and CentOS 8 based Docker containers and having issues with the CentOS 8 ones. With the centos:8 image, the RPM database eventually gets corrupted due to the default overlay2 storage driver used by Docker. This issue doesn't show with the centos:7 container. It already comes with the "fastestmirror" and "ovl" plugins installed. The "ovl" plugin is a workaround to avoid this corruption. See the bottom of https://docs.docker.com/storage/storagedriver/overlayfs-driver/ for more details. Fedora 29 and 30 already have an equivalent "dnf-plugin-ovl" package ( https://src.fedoraproject.org/rpms/dnf-plugin-ovl) However, I couldn't find it for RHEL8 or CentOS 8. I can use the "touch" workaround for now. But are there plans to bring this plugin to CentOS 8 and make it part of the CentOS 8 image, just like on CentOS 7? Or is there some other way to achieve the same with dnf? Thanks in advance, Richard -- Dr. Richard Berger richard.berger(a)temple.edu Office: SERC 716 Research Associate Professor, Dept. of Chemistry, College of Science and Technology Temple University, Philadelphia PA 19122

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Re: [CentOS] Top 7 Programming Languages That Employers Really Want
by Patrick Laimbock 18 Oct '19

18 Oct '19

-----Original message----- > From:Turritopsis Dohrnii Teo En Ming <teo.en.ming.smartphone(a)gmail.com> > Sent: Friday 18th October 2019 4:28 > To: J Martin Rushton via CentOS <centos(a)centos.org> > Subject: [CentOS] Top 7 Programming Languages That Employers Really Want [snip] Your posting fails to follow the CentOS mailinglist policy [1], specifically: Do not Cross Post - you also sent the same question to the Fedora mailinglist. Stay on-topic - your question does not relate to CentOS (nor Fedora) Netiquette - research *before* posting to the list. Your question is easily answered by searching Google. Please follow the mailinglist policy and read http://www.catb.org/~esr/faqs/smart-questions.html before posting. Thanks, Patrick [1] https://wiki.centos.org/GettingHelp/ListInfo/Policy

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Top 7 Programming Languages That Employers Really Want
by Turritopsis Dohrnii Teo En Ming 18 Oct '19

18 Oct '19

Subject: Top 7 Programming Languages That Employers Really Want Good day from Singapore, Article: Top 7 Programming Languages That Employers Really Want Author: Nick Kolakowski Date Published: 14 October 2019 Link: https://insights.dice.com/2019/10/14/7-programming-languages-employers-want/ This is just a quick survey. May I know what programming languages do you know? I am considering being a programmer or developer. How long will it take for me to master a programming language like C++, Java, and Python? Thank you very much. -----BEGIN EMAIL SIGNATURE----- The Gospel for all Targeted Individuals (TIs): [The New York Times] Microwave Weapons Are Prime Suspect in Ills of U.S. Embassy Workers Link: https://www.nytimes.com/2018/09/01/science/sonic-attack-cuba-microwave.html ******************************************************************************************** Singaporean Mr. Turritopsis Dohrnii Teo En Ming's Academic Qualifications as at 14 Feb 2019 and refugee seeking attempts at the United Nations Refugee Agency Bangkok (21 Mar 2017) and in Taiwan (5 Aug 2019): [1] https://tdtemcerts.wordpress.com/ [2] https://tdtemcerts.blogspot.sg/ [3] https://www.scribd.com/user/270125049/Teo-En-Ming -----END EMAIL SIGNATURE-----

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What is /etc/subuid ?
by Valeri Galtsev 18 Oct '19

18 Oct '19

Dear Experts, Could someone enlighten me about the following file: /etc/subuid ? This file appears to be owned by "setup" package. This is CentOS 7 system, and until now these files if existed were never changed. Today I have added user quite routine way, by doing /usr/sbin/groupadd -g 4500 [username] /usr/sbin/useradd -g [username] -u 4500 -c "User Name, email@domain" [username] And the file /etc/subuid changed and user was added into it: [username]:100000:65536 Nothing like that was happening before. This is first time I create account after update done on Oct 3, 2019. I checked several CentOS 7 machines, basically doing this: # grep subuid /usr/sbin/useradd Binary file /usr/sbin/useradd matches And CentOS 7 machines indeed may have that file name in the useradd binary. None of CentOS 6 machines has that. I tried to do FreeBSD-ism: man /etc/subuid came empty, and realized that I'm doing FreeBSD-ism. I tried to do search on the web (did not "google", I use duckduckgo... so I "did search"), and came pretty much empty. Is it just me, or indeed something in CentOS 7 indeed changed? And what is it? Another question on the same note: how do we find out what the file is about and is used for in Linux, apart from searching on the web. (When there are surprises like the one I had today, one does like to know what this particular file is used for). Thanks in advance for your answers. Valeri ++++++++++++++++++++++++++++++++++++++++ Valeri Galtsev Sr System Administrator Department of Astronomy and Astrophysics Kavli Institute for Cosmological Physics University of Chicago Phone: 773-702-4247 ++++++++++++++++++++++++++++++++++++++++

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Crashed a CentOS 8 installation.
by Thomas Stephen Lee 18 Oct '19

18 Oct '19

Hi, Note: Please do this on a test VM. My issue: I took the output of the following command $ yum list installed | xargs -n3 | column -t | tail -n +3 |cut -d' ' -f1 > packages.list from a CentOS 7.7 Installation. and did $ dnf install $(cat packages.list) --setopt=strict=0 on Freshly installed Minimal CentOS 8 VM. When I reboot I get Failed to switch root: Specified switch root path /sysroot does not seem to be an OS tree. os-release file is missing. What am I doing wrong? packages.list attached thanks --- Thomas Stephen Lee

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Hiding a grub menuentry?
by James Pearson 17 Oct '19

17 Oct '19

Does anyone know if it is possible to 'hide' a grub menuentry with CentOS 7 ? I have a custom menuentry that I don't want to be seen on the grub screen - but it needs to be selectable as the entry to boot via 'grub2-reboot' I've scanned the grub2 documentation - but I can't find anything obvious - so I'm guessing it can't be done - unless someone knows otherwise ? Thanks James Pearson

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