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CentOS-8(2011): osbuild - missing selinux subpackage?
by Leon Fauster 08 Dec '20

08 Dec '20

Briefly, while updating some workstation I came across this. The update to CentOS-8(2011) passes without issues (because best=False). So, I guess that all packages landed at the mirror host - but osbuild-selinux is missing? # LANG=C yum update Last metadata expiration check: 0:00:39 ago on Tue Dec 8 01:18:19 2020. Dependencies resolved. Problem: package osbuild-18-3.el8.noarch requires (osbuild-selinux if selinux-policy-targeted), but none of the providers can be installed - package osbuild-composer-20.1-1.el8.x86_64 requires osbuild >= 18, but none of the providers can be installed - cannot install the best update candidate for package selinux-policy-targeted-3.14.3-54.el8.noarch - cannot install the best update candidate for package lorax-composer-28.14.55-2.el8.x86_64 ============================================================================================================================================================================= Package Architecture Version Repository Size ============================================================================================================================================================================= Skipping packages with broken dependencies: osbuild noarch 18-3.el8 appstream 53 k osbuild-composer x86_64 20.1-1.el8 appstream 2.8 M Transaction Summary ============================================================================================================================================================================= Skip 2 Packages Nothing to do. Complete!

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CentOS 8.2: error running non-shared postrotate script for /var/log/mysql/mysqld.log
by Alexander Farber 08 Dec '20

08 Dec '20

Hello fellow CentOS users! I have installed CentOS 8.2.2004 with the following packages: mysql-common-8.0.21-1.module_el8.2.0+493+63b41e36.x86_64 mysql-8.0.21-1.module_el8.2.0+493+63b41e36.x86_64 mysql-errmsg-8.0.21-1.module_el8.2.0+493+63b41e36.x86_64 mysql-server-8.0.21-1.module_el8.2.0+493+63b41e36.x86_64 Then I have run mysql_secure_installation and among other things set the root password for MySQL As result I am greeted with the following anachron mail every morning: /etc/cron.daily/logrotate: mysqladmin: connect to server at 'localhost' failed error: 'Access denied for user 'root'@'localhost' (using password: NO)' error: error running non-shared postrotate script for /var/log/mysql/mysqld.log of '/var/log/mysql/mysqld.log ' I understand that the reason is me having set the root password for MySQL. But my question is how to provide the password to postrotate without disclosing it too much? Other than that the MySQL works well, I use it to host 3 Wordpress websites at my CentOS 8 Linux server (haproxy -> Jetty x 3 -> FastCGI -> php-fpm -> Wordpress -> MySQL) Greetings from Germany Alex

4 3

Trying to find gcc 5
by mark 07 Dec '20

07 Dec '20

Hi, folks, It seems I can't run a version of calibre newer than 3.23 without at least one library from gcc-5 (and the calibre attitude seems to be "screw you, 4's ancient, move to another distro"). I've added the scl repo - what devtoolset do I need to install? mark

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/dev/mapper/cl-root filesystem corrupted?
by Robert G. (Doc) Savage 07 Dec '20

07 Dec '20

A client's (truly ancient) file server running CentOS 7 suddenly started misbehaving, and I believe the ext4 filesystem on /dev/mapper/cl-root may be corrupted. A reboot fails with a file system check and drops me into maintenance mode. I tried booting from a live C7 DVD and as root running e2fsck. It complains that the superblock could not be read and suggests running "e2fsck -b 8193 <device>". That also fails. Is there a way to more forcefully "encourage" e2fsck to do its job without totally destroying that filesystem? --Doc Savage Fairview Heights, IL

2 2

ntpdate past CentOS 7
by Jerry Geis 07 Dec '20

07 Dec '20

So ntpdate is no longer present past CentOS 7. Many times people want "internal" NTP servers - not opening firewalls to allow external pool.ntp.org kind of stuff. ntpdate was "nice" in that I could just run once a day as "ntpdate name" and all good. Is there a similar client for CentOS 8 ? I saw chrony - but does not seem to be a command line command and I would also have to edit a file - Both are not desirable. Just looking for a simple - flexible command like I have been using "ntpdate name" for CentOS 8. Thanks, Jerry

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Retrieving files from dd backup
by H 06 Dec '20

06 Dec '20

Running CentOS 7 I have a previously combined backup of a disk with three partitions using dd. I now need to restore one single file from this backup and after perusing the internet, specifically https://unix.stackexchange.com/questions/31669/is-it-possible-to-mount-a-gz…, I have done the following: - installed squashfs-tools - installed kpartx - made a squash image of the dd backup and mounted it - used kpartx to create devices for the three partitions under /dev/mapper/loopNpP - I can now mount the first partition, which is the EFI partition, and access it - the second partition, the boot partition, fails to mount since it has the same UUID as the disk I am using in the computer, and of which it is an earlier dd backup. Since I am not interested in the boot partition - at least not right now - I moved on. - I am, however, interested in the third partition which is LUKS encrypted. Running 'cryptsetup luksOpen /dev/sda3 my_encrypted_volume' I can decrypt it with the password - trying to mount the decrypted version with 'mount /dev/mapper/my_encrypted_volume /media/my_device' results in a failure message 'mount: unknown filesystem type 'LVM2_member' - another website, https://askubuntu.com/questions/766048/mount-unknown-filesystem-type-lvm2-m…, suggests I could run vgdisplay to get the UUID and then rename it using vgrename But, vgdisplay shows only one vg and I am afraid to rename the VG UUID shown by vgdisplay since it might refer to the VG currently in use... Does anyone have any insight or suggestions into the above and how to proceed while being absolutely certain I will not be messing up the running part of the system? Thanks!

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Logitech C922 webcam
by H 06 Dec '20

06 Dec '20

Just installed the above USB webcam but it is not recognized by dmesg | grep usb, nor does Zoom recognize it. I was under the understanding it should not require a driver, or? I am running CentOS 7. Thanks.

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Selecting a Desktop
by david 06 Dec '20

06 Dec '20

Folks Some of my users like GNOME, some like XFCE, and there's even a MATE lover out there. And some would like to change desktops from time to time. Is there some way to allow a user to choose her own desktop? I can envision at least two ways this might be done: 1) Present a user with a command-line login, and have a program (let's call it 'gui') so the user could type in "gui g" for gnome, "gui m' for mate, and so on. 2) Present a uses with a gui login-in screen, which also includes a desktop selector. Of course, it would only offer those desktops which are installed. Is there such? Gui-Confused David

2 1

EFI System Partition on RAID 1 array
by Nicolas Kovacs 05 Dec '20

05 Dec '20

Hi, I'm currently writing a little documentation on how to install CentOS 7 on manually partitioned disks, e. g. boot in Rescue Mode first, partition using fdisk or gdisk, reboot, start the installer and use the installer to format these partitions. I have a total of 9 (3 x 3) situations: * single disk (BIOS+MBR, BIOS+GPT, UEFI) * RAID 1 on 2 disks (BIOS+MBR, BIOS+GPT, UEFI) * RAID 6 on 4 disks (BIOS+ BR, BIOS+GPT, UEFI) Everything works fine so far and I've completed seven out of nine of these setups. But right now I'm stuck with a problem on how to manually setup RAID 1 with UEFI. Here's what I do. Fire up gdisk on /dev/sda. Create 4 RAID partitions (FD00): * 200 MB for /dev/md/EFI * 500 MB for /dev/md/boot * 4 GB for /dev/md/swap * 55 MB for /dev/md/root Create the RAID arrays: # mdadm --create /dev/md/EFI --level=1 --raid-devices=2 \ --metadata=1.2 /dev/sda1 /dev/sdb1 mdadm: array /dev/md/boot started # mdadm --create /dev/md/boot --level=1 --raid-devices=2 \ --metadata=1.2 /dev/sda2 /dev/sdb2 mdadm: array /dev/md/boot started # mdadm --create /dev/md/swap --level=1 --raid-devices=2 \ --metadata=1.2 /dev/sda3 /dev/sdb3 mdadm: array /dev/md/swap started # mdadm --create /dev/md/root --level=1 --raid-devices=2 \ --metadata=1.2 /dev/sda4 /dev/sdb4 mdadm: array /dev/md/root started And then I reboot, fire up the installer and assign these RAID arrays respectively to the EFI system partition as well as /boot, swap and /. Unfortunately I won't even reach the GRUB menu on boot. Only thing I get after the initial reboot is the EFI shell. Now I've tried this again, this time partitioning *and* formating using Anaconda. * one mountpoint for /boot/efi (RAID 1) * one mountpoint for /boot (RAID 1) * one mountpoint for swap (RAID 1) * one mountpoint for / (RAID 1) After the initial reboot, everything works fine. EFI on a RAID 1 array apparently works. So what am I missing and/or doing wrong in my manual setup? Cheers, Niki -- Microlinux - Solutions informatiques durables 7, place de l'église - 30730 Montpezat Site : https://www.microlinux.fr Blog : https://blog.microlinux.fr Mail : info(a)microlinux.fr Tél. : 04 66 63 10 32 Mob. : 06 51 80 12 12

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CentOS 7 disk identifier
by H 04 Dec '20

04 Dec '20

Are disk identifiers important in CentOS? I have two disks that used to be in a Intel fake RAID1 configuration and I now see have identical disk identifiers of 00000000-0000-0000-0000000000. I now want to use only one of them and later use mdraid for a software RAID1 configuration. Googling suggests that: (1) disk identifiers are /not/ important and (2) they are using the format 0x12345678. However fdisk -l displays the disk identifiers of my disks in the long UUID format. Further, another disk in the system does use a long UUID. Last, googling suggests there is confusion between disk identifiers and partition UUIDs. I am specifically asking about the former.

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