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34733 discussions

erasing a disk
by david 14 Sep '20

14 Sep '20

Folks I've encountered situations where I want to reuse a hard-drive. I do not want to preserve anything on the drive, and I'm not concerned about 'securely erasing' old content. I just want to be able to define it as an Physical Volume (in a logical volume set), or make it a ZFS disk, or sometimes make it a simple EXT3, ExFAT or NTFS disk. However, old 'signatures' get in the way and Linux sometimes refuses to let me proceed. I know that a fool-proof solution is to use the "dd if=/dev/zero bs=32768 oflag=direct" on the disk, but when we're talking USB-connected hard drives of 8 TB, that's an operation that can take days. The disk in question might even have been corrupted. This would make using 'zpool destroy' to clear out a ZFS disk, or I've tried erasing the first megabyte of the disk, but there are ZFS or LVM structures that get in the way. So, does anyone have an efficient way to erase structures from a disk such that it can be reused? Something like -erase first N blocks (block defined as 4096) - Erase <number> blocks starting at block <number> - erase last <number> blocks At least such an algorithm would be quicker than erasing 8 TB of data. David

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Auditd NETFILTER_PKT record missing src port, dst port
by Akshar Kanak 14 Sep '20

14 Sep '20

Dear team The auditd log for NETFILTER_PKT event does not contain the src port , desination port , in and out interface . Has it been removed permanently ( https://patchwork.kernel.org/patch/9638183/) or can it be enabled by some configuration by auditctl ? centos version : CentOS Linux release 7.6.1810 (Core) out kernel version : Linux version 3.10.0-1127.8.2.el7.x86_64 ( mockbuild(a)kbuilder.bsys.centos.org) (gcc version 4.8.5 20150623 (Red Hat 4.8.5-39) (GCC) ) #1 SMP Tue May 12 16:57:42 UTC 2020 Thanks and regards Akshar

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"Not using downloaded epel/repomd.xml"
by Nicolas Kovacs 14 Sep '20

14 Sep '20

Hi, I'm regularly getting spammed by my own servers, with the following message: /etc/cron.hourly/0yum-hourly.cron: Not using downloaded epel/repomd.xml because it is older than what we have: Current : Sat Sep 12 19:05:04 2020 Downloaded: Thu Sep 10 19:12:19 2020 How can I make this nonsense stop? 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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Re: [CentOS] Server entering Emergency Shell, but continues fine after pressing Enter
by Gordon Messmer 12 Sep '20

12 Sep '20

On 9/12/20 1:04 PM, Quinn Comendant wrote: > [root@myhost ~] systemctl status initrd-switch-root.service > ● initrd-switch-root.service - Switch Root > Loaded: loaded (/usr/lib/systemd/system/initrd-switch-root.service; static; vendor preset: disabled) > Active: failed (Result: signal) since Sat 2020-09-12 19:41:13 UTC; 17min ago > Process: 204 ExecStart=/usr/bin/systemctl --no-block --force switch-root /sysroot (code=killed, signal=TERM) Ah, this seems to be a known issue with the update to 7.8: https://access.redhat.com/solutions/4973191 The initrd contains an old systemd binary, and should be rebuilt. The replacement initrd will have an updated binary: |# cp /boot/initramfs-*.x86_64.img /root ||# dracut --force --regenerate-all| ||

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Re: [CentOS] Server entering Emergency Shell, but continues fine after pressing Enter
by Gordon Messmer 12 Sep '20

12 Sep '20

On 9/12/20 1:04 PM, Quinn Comendant wrote: > I don't see any errors from `systemctl status initrd-parse-etc.service` or > `journalctl -b 0` (I've pasted the full output here:https://write.as/at21opjv3o9fin1t.txt) I see errors in the journalctl output. Look into these: Sep 12 19:41:12 myhost systemd-vconsole-setup[84]: /usr/bin/setfont failed with error code 71. Sep 12 19:41:12 myhost systemd-vconsole-setup[84]: ................... Sep 12 19:41:12 myhost systemd-vconsole-setup[84]: setfont: putfont: 512,8x16: failed: -1 Sep 12 19:41:12 myhost systemd-vconsole-setup[84]: putfont: PIO_FONT: Invalid argument Sep 12 19:41:12 myhost systemd-vconsole-setup[117]: /usr/bin/setfont failed with error code 71. Sep 12 19:41:13 myhost systemd[1]: [/etc/systemd/system.conf:15] Unknown lvalue 'TimeoutSec' in section 'Manager' The former errors might be normal on a system with no VGA, and you mentioned seeing this over serial. Do you see those errors on systems that boot normally? Do any of those system share a hardware configuration with the system that doesn't? The latter error seems more likely to be the cause of the emergency shell, but that's a guess.

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Server entering Emergency Shell, but continues fine after pressing Enter
by Quinn Comendant 12 Sep '20

12 Sep '20

Hello all, I've got an odd problem that doesn't seem to be mentioned anywhere. I have several identical CentOS 7 servers (GCE instances). I recently ran `yum update` and rebooted all of them. All the servers came back fine except one. I opened a connection to the serial console of the broken server, and was greeted with this prompt: … Cannot open access to console, the root account is locked. See sulogin(8) man page for more details. Press Enter to continue. I pressed Enter, and the boot process continued successfully! Just to test, I restarted the server again, and the same thing happened: I had to manually log in to the console and press Enter before it would complete the boot process. No other step was required. I also tried creating a snapshot of the disk, and booted a new VM with a boot disk imaged from the snapshot. The same problem occurred, pressing Enter was all that was required. Earlier in the boot log, it shows "Started Emergency Shell", which is why there was a "Press Enter" prompt. The error that the "root account is locked" isn't the issue; the root account is locked on all our servers. So, in summary: something is causing the server to enter an Emergency Shell, but continues successfully after pressing Enter. That's odd because if Emergency Shell is loaded, usually something more serious is happening and requires more actions to get the server to boot. Anybody have any idea what could be causing this? I don't see any significant errors in the boot log, but I would appreciate if anyone has a moment to help me look for issues. Here's a copy of the serial console boot log – you can find the "Press Enter to continue" on line 536: https://write.as/dwuts24dcw6yh0kf.txt Thanks! Quinn

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Thunderbird won't start after move to new box
by Gary Stainburn 12 Sep '20

12 Sep '20

I've tried moving my Thunderbird profile from one C7 box, a standard PC to another C7 box, a DELL server. I did this by rsync'ing ~/.thunderbird. However, on the new box, Thunderbird only starts if I run it -safe-mode. If I don't run it in safe mode I see the window flash up and instantly close. No errors or notifications appear in the terminal window., Anyone got suggestions on what could be wrong, or how I can diagnose it? Google just seems to bring up hits for problems on Windows boxes.

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rpm spec:: Requires conditions format :: lower not working
by Adrian Sevcenco 08 Sep '20

08 Sep '20

Hi! I'm trying to give a range of versions for a dependency in the form of : Requires: xrootd-server >= 4.1.0 Requires: xrootd-server < 5.0.0 with the already installed package having the versions: [rpmbuild@el7build SPECS]$ rpm -qa --queryformat '%{name} %{version}\n' | grep xrootd | sort xrootd 4.12.2 xrootd-client 4.12.2 xrootd-client-devel 4.12.2 xrootd-client-libs 4.12.2 xrootd-devel 4.12.2 xrootd-libs 4.12.2 xrootd-private-devel 4.12.2 xrootd-selinux 4.12.2 xrootd-server 4.12.2 xrootd-server-devel 4.12.2 xrootd-server-libs 4.12.2 when i'm trying to build i get: error: Failed build dependencies: xrootd-devel < 5.0.0 is needed by xrootd-alicetokenacc-1:1.3.1-2.el7.x86_64 xrootd-server-devel < 5.0.0 is needed by xrootd-alicetokenacc-1:1.3.1-2.el7.x86_64 Does anyone have any idea why the condition is not fulfilled? i am aware of both http://ftp.rpm.org/api/4.4.2.2/dependencies.html and http://ftp.rpm.org/api/4.4.2.2/rpmvercmp_8c-source.html (under assuption that these holds true for the current 4.11.3 from centos 7) Thanks a lot! Adrian

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Plasma problem with numeric keypad
by Alessandro Baggi 08 Sep '20

08 Sep '20

Hi list, I'm running CentOS 8.2 with Plasma from EPEL and I noticed that I have problem using numeric keypad of my keyboard when using plasma application like Konsole, Kcalc, Konqueror and all application of Plasma. Using Firefox, Thunderbird, xterm, Libreoffice all works as expected. So this problem is related to Plasma application. I noticed the same problem on sddm login. I noticed that to make the numeric keypad to work I need to press SHIFT+NUMKEY. I tried to manage Plasma keyboard configuration but nothing worked. I tried my keyboard on other PC and distro but the problem does not occour. I should try this using GNOME or XFCE but being a KDE user I would avoid to install the others. There is a way to solve this problem? Thank you in advance. Alessandro.

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Conversion from Centos 5 to Centos 7 & mailx changes
by Gregory P. Ennis 07 Sep '20

07 Sep '20

Everyone, I have just upgraded a Centos 5 server to a Centos 7 server and am having difficulty with a change of behavior of mailx with the use of a command line of : mail -s 'This is the subject' user(a)domain.com < text_file.txt On Centos 5 when mailx was used by a program started by a cron job we were able to send a text file as an email message and the headers did not contain 'Content-Transfer-Encoding: base64' On Centos 7 the headers contain 'Content-Transfer-Encoding: base64' and when the client gets the e-mail they are unable to open it up. The interesting thing is that on Centos 7 when the command line is used by typing the above command 'Content-Transfer-Encoding: 7bit' is placed in the header and the client can see the e-mail without a problem. I have looked for a way to control the 'Content-Transfer-Encoding:' header to '7bit' when we use a cron job, but I have not been able to figure out how. Your suggestions would be appreciated. Thank you, -- Greg Ennis

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