Discuss July 2017

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108 participants
98 discussions

attempt to access beyond end of device XFS Disks
by Götz Reinicke - IT Koordinator 05 Jul '17

05 Jul '17

Hi, I rebooted some CEPH servers with 24 HDs and do get some messages for some of the disks: [ 519.667055] XFS (sdk1): Mounting V4 Filesystem [ 519.692307] XFS (sdk1): Ending clean mount [ 519.781975] attempt to access beyond end of device [ 519.781984] sdk1: rw=0, want=1560774288, limit=1560774287 All disks are xfs formated and currently I don't see any problem on the CEPH side. But I have a bad feeling. I updated the kernel too from kernel-3.10.0-514.21.1 to kernel-3.10.0-514.26.1, but nothing changed. Any hints, suggestions? Thanks & regards . Götz

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System Start-Up Issue Progress
by Chris Olson 04 Jul '17

04 Jul '17

My thanks to all that responded to my posting about our virtual machine CentOS 6 system start-up issue. I found the alternative boot options to be the most helpful. Interrupting the boot-up process with Alt-d or Escape allowed me to see what appears to be a quite normal string of start, install and mount activity. However, this process ends with the system hanging at the point below: Starting ipmidetectd: ipmidetectd: No nodes configured [FAILED] Starting sendmail: It is not clear to me whether the boot-up process is hanging due to the failed starting of ipmidetectd or sendmail, but I suspect that the ipmidetectd start up failure is the actual cause. It is not clear whether any IPMI related features were ever installed. Interrupting the boot-up process and selecting Run Level 1 results in a functioning system. Starting with other Run Levels results in the incomplete boot-up process noted previously. Using the "service network start" command yielded functional network and internet connectivity. This enabled the successful execution of yum update. The update consisted of kernel and other updates with a total download size of 274 MB. After this update, the boot-up process still hangs at the point indicated above. Why this is happening is still a mystery and if it actually is IPMI related, why would this be appropriate or even needed in a CentOS system that is running on VirualBox. There is no IPMI related hardware accessible to the virtual CentOS system or on the Windows 7 host system. It would be good if the IPMI start-up could be disabled.

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Problem with ipa-client
by Nicolas Kovacs 04 Jul '17

04 Jul '17

Hi, Here's the warning that Yum currently displays: ** Found 3 pre-existing rpmdb problem(s), 'yum check' output follows: ipa-client-4.4.0-14.el7.centos.7.x86_64 has installed conflicts freeipa-client: ipa-client-4.4.0-14.el7.centos.7.x86_64 ipa-client-common-4.4.0-14.el7.centos.7.noarch has installed conflicts freeipa-client-common: ipa-client-common-4.4.0-14.el7.centos.7.noarch ipa-common-4.4.0-14.el7.centos.7.noarch has installed conflicts freeipa-common: ipa-common-4.4.0-14.el7.centos.7.noarch Any suggestions what I can do about that? (BTW, I don't use IPA) Cheers, Niki -- Microlinux - Solutions informatiques durables 7, place de l'église - 30730 Montpezat Web : http://www.microlinux.fr Mail : info(a)microlinux.fr Tél. : 04 66 63 10 32

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grub2-btrfs & yum-plugin-snapper , new from my last post here
by Andreas Benzler 03 Jul '17

03 Jul '17

Hello Guys, While i work out the snapper on fedora 25 I've learnd more about python and snapper. Here the changes: Snapper: Created a combat util-linux 2.24.2 from fedora 20, static only. This make snapper rollback available (needfull thing). Tryed to patch snapper, there are to many changes. This will not breake centos 7 system. Only works for x86 / amd64 only this days & Centos 7, removed many condition. Grub2-Btrfs: Removed "Requires: grub2", because that will install grub2 on efi systems. yum-plugin-snapper: - Add gpl v3 for now - Complete rewrote the plugin against the snapper dbus interface. - filesystem root level check - add single shot option, as it was on fedora before I patched it. - more flexible as other ones I saw around. - conflicts yum-plugin-fs-snapshot Everything can be found at: https://copr.fedorainfracloud.org/coprs/andybe/Centos7Btrfs/ Snapper-Gui: Needs epel-release because of python34 python34-pygobject3 is one of the badest hack inside spec file. I wanne see it run with snapper-gui and compile on copr. can be found at https://copr.fedorainfracloud.org/coprs/andybe/CentOS7Python34/packages / Everything was tested on a Virtual Machine: - Snapper-GUI - snapper rollback - yum-plugin - every option. - grub2-btrfs The only thing I still want to care is the grub2-btrfs plugin, so it fits to CentOS 7. Then the personal project is done. At this time I will reinstall CentOS on my laptop on btrfs and use backup by send & receive on a blockdevice ZFS at my home server or other storage with btrfs. I will see. Hopefully turn work into fun :-). Sincerely Andy PS: It's up to you to get a taste on.

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Physically moving a mail server vs. cached DNS
by Nicolas Kovacs 03 Jul '17

03 Jul '17

Hi, I just moved my main mail account and web content from a low-cost (low-quality) provider to my own root server running CentOS 7. I transferred the domain name from DNS management to my registrar, configured BIND, Apache, Postfix, Dovecot, NTP, SELinux, etc. Now things are running rather nicely. One thing is puzzling me though. The updated mail server DNS seems to have spread around so far. $ host -t mx microlinux.fr microlinux.fr mail is handled by 10 mail.microlinux.fr. Unfortunately, some hosts seem to still keep the old DNS information, which was: $ host -t mx microlinux.fr microlinux.fr mail is handled by 10 mx1.nfrance.com. In your experience, what's the "longest" a DNS cache is configured to keep outdated information? A day? A week? A month? Longer? Cheers, Niki

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AMD Ryzen and CentOS
by Yves Bellefeuille 03 Jul '17

03 Jul '17

I have a new system with an AMD Ryzen 1600 CPU and I'm trying to run CentOS, so far without success. The only information I could find was a post reporting that CentOS 7 would crash during installation on a Ryzen system: https://www.centos.org/forums/viewtopic.php?t=61831 . I tried updating to the latest elrepo "mainline stable" kernel, version 4.11 (by booting from a live CD and using chroot to enter CentOS: that worked), but the system still doesn't work properly. I'm using CentOS 6 but I'll switch to CentOS 7 if that will help. (But I assume that if installing the latest kernel didn't help, neither would going to CentOS 7.) Any suggestions? Is it known whether the next version will work properly with Ryzen? Yves Bellefeuille <yan(a)storm.ca>

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rsync and cause/source of an empty file
by James B. Byrne 01 Jul '17

01 Jul '17

We transfer files from a VAN provider at 15 minute intervals using rsync over ssh. The setup is somewhat complicated in that the VAN will not permit direct rsync access and so we establish the link via sshfs and then mount remote location as local. My question is, given the above conditions and the following rsync command: /usr/bin/rsync --chmod=o+r --chmod=g+w --itemize-changes --remove-sent-files --times /var/spool/imanet/pick_up/* /var/spool/imanet/drop_off Under what circumstances would a file containing data at the remote end (/var/spool/imanet/pick_up/) arrive at our end (/var/spool/imanet/drop_off) as an empty file? No transmission errors were logged and multiple files were transferred during the same session. All but one arrived with their contents intact. -- *** e-Mail is NOT a SECURE channel *** Do NOT transmit sensitive data via e-Mail Do NOT open attachments nor follow links sent by e-Mail James B. Byrne mailto:ByrneJB@Harte-Lyne.ca Harte & Lyne Limited http://www.harte-lyne.ca 9 Brockley Drive vox: +1 905 561 1241 Hamilton, Ontario fax: +1 905 561 0757 Canada L8E 3C3

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[Fwd: CIA Outlaw Country attack against CentOS / Rhel (and Fedora?) Is this credible?]
by Dario Lesca 01 Jul '17

01 Jul '17

Do you know this? Dario ------- Messaggio inoltrato ------- Da: stan <stanl-fedorauser(a)vfemail.net> Reply-to: Community support for Fedora users <users(a)lists.fedoraproject.org> A: users(a)lists.fedoraproject.org Oggetto: CIA Outlaw Country attack against CentOS / Rhel (and Fedora?) Is this credible? Data: Thu, 29 Jun 2017 15:51:43 -0700 Wikileaks released a document about an attack against CentOS / Rhel. https://wikileaks.org/vault7/#OutlawCountry Here's the text, there are some docs there also. OutlawCountry 29 June, 2017 Today, June 29th 2017, WikiLeaks publishes documents from the OutlawCountry project of the CIA that targets computers running the Linux operating system. OutlawCountry allows for the redirection of all outbound network traffic on the target computer to CIA controlled machines for ex- and infiltration purposes. The malware consists of a kernel module that creates a hidden netfilter table on a Linux target; with knowledge of the table name, an operator can create rules that take precedence over existing netfilter/iptables rules and are concealed from an user or even system administrator. The installation and persistence method of the malware is not described in detail in the document; an operator will have to rely on the available CIA exploits and backdoors to inject the kernel module into a target operating system. OutlawCountry v1.0 contains one kernel module for 64-bit CentOS/RHEL 6.x; this module will only work with default kernels. Also, OutlawCountry v1.0 only supports adding covert DNAT rules to the PREROUTING chain. My first take is that this doesn't represent a very serious threat. Do you disagree? _______________________________________________ users mailing list -- users(a)lists.fedoraproject.org To unsubscribe send an email to users-leave(a)lists.fedoraproject.org -- Dario Lesca (inviato dal mio Linux Fedora 25 Workstation)

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Discuss July 2017