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Re: [CentOS] LVM and thin snapshots
by Strahil 27 Sep '19

27 Sep '19

Hi , You can also check if BOOM boot manager can work with thin LVM. I really like that feature, since CentOS7.x Best Regards, Strahil NikolovOn Sep 27, 2019 12:39, Georgios <gpdsbe+centos(a)mailbox.org> wrote: > > Hi there! > > Im new here. > > Im trying to install Centos 8 on my laptop. I also want to have a > contingency plan in case something brakes. > > My first thoughts were to use LVM. > > The idea is that i would take multiple snapshots of the system during > the day/week and will keep them for a short time. > > I read RHEL documentation about how lvm works and pretty much understand > how to manage the above scenario with LVM snapshots and encryption. > If i understood lvm snapshots will cause delay the system after multiple > snapshots. The best way to avoid it is using thin snapshots. > > At rhel documentation it says that is possible for a non thin volume to > get a thin snapshots. > > [Correct me if my above assumptions are wrong or if there is a better > solution for my purpose.] > > So i created a group with 3 volumes groups and one thin pool. > > Im trying to take a snapshot and i get the message. > > "Cannot use writable LV as the external origin." > > I read somewhere that i should change it to read only and then take a > snapshot. Although that would be a problem i just try it to see if it > works. Then i got the message > > "Cannot use active LV for the external origin" > > Any ideas??? > > Thanks in advance > > Georgios > _______________________________________________ > CentOS mailing list > CentOS(a)centos.org > https://lists.centos.org/mailman/listinfo/centos

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LVM and thin snapshots
by Georgios 27 Sep '19

27 Sep '19

Hi there! Im new here. Im trying to install Centos 8 on my laptop. I also want to have a contingency plan in case something brakes. My first thoughts were to use LVM. The idea is that i would take multiple snapshots of the system during the day/week and will keep them for a short time. I read RHEL documentation about how lvm works and pretty much understand how to manage the above scenario with LVM snapshots and encryption. If i understood lvm snapshots will cause delay the system after multiple snapshots. The best way to avoid it is using thin snapshots. At rhel documentation it says that is possible for a non thin volume to get a thin snapshots. [Correct me if my above assumptions are wrong or if there is a better solution for my purpose.] So i created a group with 3 volumes groups and one thin pool. Im trying to take a snapshot and i get the message. "Cannot use writable LV as the external origin." I read somewhere that i should change it to read only and then take a snapshot. Although that would be a problem i just try it to see if it works. Then i got the message "Cannot use active LV for the external origin" Any ideas??? Thanks in advance Georgios

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Update to Centos 7.7 / Arch ppc64le / Problem with nvidia driver
by Ralf Aumüller 27 Sep '19

27 Sep '19

Hello, today I updated a CentOS 7.6 ppc64le machine to CentOS 7.7. After reboot to the new kernel (4.18.0-80.7.2.el7.ppc64le) dkms could not build the nvidia-module. Error-message from dkms: Compiler version check failed: The major and minor number of the compiler used to compile the kernel: gcc version 8.3.1 20190311 (Red Hat 8.3.1-3) (GCC) does not match the compiler used here: cc (GCC) 4.8.5 20150623 (Red Hat 4.8.5-39) Output of /proc/version with new kernel running is: Linux version 4.18.0-80.7.2.el7.ppc64le (mockbuild(a)ppc64le-01.bsys.centos.org) (gcc version 8.3.1 20190311 (Red Hat 8.3.1-3) (GCC)) #1 SMP Thu Sep 12 15:45:05 UTC 2019 Problem seams to be: The kernel was compiled with gcc-version 8.3.1 and installed is gcc 4.8.5. All previous kernels were compiled with gcc 4.8.5. See: #cat /usr/src/kernels/*/include/generated/compile.h |grep LINUX_COMPILER define LINUX_COMPILER "gcc version 4.8.5 20150623 (Red Hat 4.8.5-36) (GCC)" define LINUX_COMPILER "gcc version 4.8.5 20150623 (Red Hat 4.8.5-36) (GCC)" define LINUX_COMPILER "gcc version 4.8.5 20150623 (Red Hat 4.8.5-36) (GCC)" define LINUX_COMPILER "gcc version 4.8.5 20150623 (Red Hat 4.8.5-36) (GCC)" define LINUX_COMPILER "gcc version 4.8.5 20150623 (Red Hat 4.8.5-36) (GCC)" define LINUX_COMPILER "gcc version 8.3.1 20190311 (Red Hat 8.3.1-3) (GCC)" define LINUX_COMPILER "gcc version 8.3.1 20190311 (Red Hat 8.3.1-3) (GCC)" Any comments? Best regards, Ralf

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Centos 7, netboot using initramfs.img
by R C 26 Sep '19

26 Sep '19

Hello, I am trying to boot a node using initramfs. (actually it is a little more complicated, I am booting the node using perceus and vnfs images). Anyway, when booting with a kernel and using initramfs.img, dracut is trying to to configure both Network NICs, the first one would be fine, but I don't want it to ven try to configure the 2nd one using dhcp. How can I stop dracut from trying to do that? thanks, Ron

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Re: [CentOS] [PROVENANCE INTERNET] Re: Missing packages in centos8 mirrors or do I miss something?
by LAHAYE Olivier 26 Sep '19

26 Sep '19

For those who come across this thread, I've found the exact list of changed and dropped package between rhel:7 and rhel:8: https://access.redhat.com/documentation/en-us/red_hat_enterprise_linux/8/ht… Too bad that the "note" column is empty in the dropped package table. NO word about reason or possible alternatives. Also too bad that those drops were not advertised before release so developers could think about migrating there code. That would have helped me a lot if I had knew that docbook-utils-pdf would be dropped....I would have searched for an alternative long ago. Olivier. Le 26/09/2019 16:02, « CentOS au nom de LAHAYE Olivier » <centos-bounces(a)centos.org au nom de olivier.lahaye(a)cea.fr> a écrit : [...] -Is there a place where I could read about all dropped packages? I've searched in redhat changelog and centos and all I could find is a few packages dropped like NIS related or so. [...]

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How to dump/restore a CentOS 7 system
by Xinhuan Zheng 26 Sep '19

26 Sep '19

Hello All, I guess it is very common for administrative purpose, to dump and restore a CentOS 7 system. I usually use dump/restore commands. However, I’m having trouble to handle installing bootloader and creating initramfs for C7 system. Does anyone know a good document source that details those procedure? Thank you, Xinhuan Zheng

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Any ETA for the cloud-images?
by rainer＠ultra-secure.de 26 Sep '19

26 Sep '19

Hi, I see they are being built, but they can't be accessed directly. Rainer

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Missing packages in centos8 mirrors or do I miss something?
by LAHAYE Olivier 26 Sep '19

26 Sep '19

Hi, I need to port OSCAR Cluster and SystemImager softwares to centos8, but I miss a lot of package that seems to be built for centos-8. For example, I cant find docbook-utils and docbook-utls-pdf while I see them here: https://koji.mbox.centos.org/koji/buildinfo?buildID=651 I’ve installed epel-release and elrepo-release and centos-release-stream. Do I miss something or is it a matter of time due to mirro syncs? I misse btrfs packages, perl-Tk packages, docbook packages and many more that I can find on https://koji.mbox.centos.org/koji/builds Where am I wrong? PS: I’m running CentOS-8 in docker (roboxes/centos8 wainting for official centos:8 container). (I think that my issue is not related to the container though as I can’t find packages on mirror repos. -- Olivier LAHAYE

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USB of ISO image
by Jerry Geis 26 Sep '19

26 Sep '19

Hi I did the dd iso to my USB. all is fine. I can mount the second partition (which is not iso 9660) and edit the grub.cfg file. Question is what do I run after that so my new menu option appears ? grub2-install /dev/sdd Is that the correct command to get grub to notice my new file ? Assuming sdd is the USB disk of course. Thanks, jerry

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USB thumb drive for CentOS 7.7 to install
by Jerry Geis 25 Sep '19

25 Sep '19

I took the "everything" iso and did the dd command to my 16G thumb drive. I booted and entered my usual ks=http://xxx on the boot line. All good so far. It gets my kickstart file and installation begins. At some point it says Installing libreoffice-opensymbol-fonts (492/1948) Retrying download of 1:libreoffice-opensymbol-fonts-5.3.6.1-21.el7.norarch then after 10 retries it fails. I have verfied this file is on my USB disk, I have re-downloaded from different mirror, the Everything file, dd that to my USB disk, tried the re-install and still the error. I don't know what to try next. Jerry

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