Discuss September 2018

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77 participants
60 discussions

Help with multi-monitor Xorg stuff
by Richard G 24 Sep '18

24 Sep '18

I have an unusual use case. I wonder if anyone can help. We use a PC with 8 HDMI outputs for powering a video wall in an operations centre. We use two Matrox video cards, each with 4 outputs. "lspci" reports these cards as" [AMD/ATI] Cape Verde PRO [FirePro W600]". On an older version of CentOS 7, I used the proprietary AMD/ATI driver. This had a utility (I roorget the name) that generated a working xorg.conf file. I could them throw up the "matchbox-window-manager" on each monitor in turn using "DISPLAY=:0.0", "DISPLAY=:0.1" etc and then throw up a full-screen chrome web browser in kiosk mode on each monitor after that. This all worked great. In a recent version of CentOS 7, this all broke. The proprietary driver no longer works. The good news is that the open source driver seems to work fine with multi-monitor in Gnome for example. My only issue is that I don't want to use Gnome across multiple monitors. I want to use matchbox-window-manager or similar, and specify individual X screen (":0.0", ":0.1" etc). How do I generate an xorg.conf file with the new open source drivers? Am I doing this all wrong? Thanks!

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Re: [CentOS] Centos on Dell XPS15
by Patrick Laimbock 24 Sep '18

24 Sep '18

-----Original message----- > From:H <agents(a)meddatainc.com> > Sent: Monday 3rd September 2018 14:52 > To: Centos Mailing List <centos(a)centos.org> > Subject: [CentOS] Centos on Dell XPS15 > > Is anyone successfully running Centos 7 on a Dell XPS15? If so, which model? If not, what was the problem? > > Thank you! I only ran Fedora 28 Workstation Live from USB stick on the latest XPS15 (9570) and did not try CentOS 7. Fedora 28 ran great and the 4K screen is beautiful but the laptop had some issues so I sent it back. Issues: - the CPU throttles when putting it under load. The "fix"was to undervolt the CPU, turn off Turbo speed in the BIOS and turn off HT in the BIOS. This issue seems similar to the thermal problem the latest MacBook Pro had. IIRC Apple fixed it in a BIOS update. I don't know if/when Dell will fix it (or if they even can fix it). - fingerprint reader does not work. With the latest XPS13 (9370) Developer Edition, Dell "fixed" it by removing the fingerprint reader. - no separate PageUp and PageDown keys. The latest XPS13 does have them but on the XPS15 there were 2 gaps in the keyboard where those keys should be but aren't. - it's not possible to open the screen 180 degrees - the webcam at the bottom of the screen (aka NoseCam) is really annoying As an alternative to the XPS15 there's the new Inspiron 15 7000 series and the Lenovo Thinkpad X1 Extreme (though I have no idea if either of them runs CentOS 7). HTH, Patrick

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[CentOS7] Firewall trouble with Kickstart
by Patrick Begou 24 Sep '18

24 Sep '18

helow my goal is to install via kickstart a CentOS 7 NFS server but I fail to set the firewall rules at installation time. In my kickstart file I set: # Firewall configuration # ssh and NFS # Ports 111 and 875 are for rquotad firewall --enabled --ssh --service=nfs --port=111:tcp,111:upd,875:tcp,875:upd On the installed server, /root/anaconda-ks.cfg contains: # Firewall configuration firewall --enabled --port=111:tcp,111:upd,875:tcp,875:upd --service=ssh,nfs But after install "firewall-cmd --list-all" returns: public (active) target: default icmp-block-inversion: no interfaces: p4p1 sources: services: ssh dhcpv6-client ports: protocols: masquerade: no forward-ports: source-ports: icmp-blocks: rich rules: An idea about my mistake ? Thanks Patrick -- =================================================================== | Equipe M.O.S.T. | | | Patrick BEGOU | mailto:Patrick.Begou@grenoble-inp.fr | | LEGI | | | BP 53 X | Tel 04 76 82 51 35 | | 38041 GRENOBLE CEDEX | Fax 04 76 82 52 71 | ===================================================================

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C7 and default sound
by Jerry Geis 24 Sep '18

24 Sep '18

When I right click on desktop and bring up "sound". I have two items. Digital output (S/PDIF) buildin audio HDMI/Displayport 2 - Gk208 HDMI audio controller It seems I always default to S/PDIF.... How can I get this to default to HDMI always ? If I select HDMI and reboot it goes back to S/PDIF. I am running pulse audio. Thanks, Jerry

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Has something replaced rhn-ssl-tool?
by Lachlan Musicman 24 Sep '18

24 Sep '18

Using CentOS 7.5, I can't (and don't expect) to see rhn-ssl-tool. But I was expecting to find something similar. I can't see anything in the recent RH documentation about it - I presume it was remove/changed with the move from Spacewalk to Satellite - but I presume the functionality is still required? Has something replaced it? Cheers L. ------ '...postwork futures are dismissed with the claim that "it is not in our nature to be idle", thereby demonstrating at once an essentialist view of labor and an impoverished imagination of the possibilities of nonwork.' Kathi Weeks, *The Problem with Work: Feminism, Marxism, Antiwork Politics and Postwork Imaginaries* <https://www.dukeupress.edu/The-Problem-with-Work/>

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Type enforcement / mechanism not clear
by Leon Fauster 23 Sep '18

23 Sep '18

Any SElinux expert here - briefly: # getenforce Enforcing # sesearch -ACR -s httpd_t -c file -p read |grep system_conf_t <no output> # sesearch -ACR -s httpd_t -c file -p read |grep syslog_conf_t <no output> # ls -laZ /etc/sysctl.conf /etc/rsyslog.conf -rw-r--r--. root root system_u:object_r:syslog_conf_t:s0 /etc/rsyslog.conf -rw-r--r--. root root system_u:object_r:system_conf_t:s0 /etc/sysctl.conf # ausearch -m avc --start recent type=SYSCALL msg=audit(1536457230.922:85): arch=c000003e syscall=6 success=no exit=-13 a0=7fff6460dcf0 a1=7fff6460dbe0 a2=7fff6460dbe0 a3=11 items=0 ppid=1362 pid=1364 auid=4294967295 uid=48 gid=48 euid=48 suid=48 fsuid=48 egid=48 sgid=48 fsgid=48 tty=(none) ses=4294967295 comm="php-fpm" exe="/usr/sbin/php-fpm" subj=system_u:system_r:httpd_t:s0 key=(null) type=AVC msg=audit(1536457230.922:85): avc: denied { getattr } for pid=1364 comm="php-fpm" path="/etc/rsyslog.conf" dev=dm-0 ino=138287 scontext=system_u:system_r:httpd_t:s0 tcontext=system_u:object_r:syslog_conf_t:s0 tclass=file My test PHP script can read /etc/sysctl.conf but not /etc/rsyslog.conf. For both no rule are found (sesearch above). So, why the script can read sysctl.conf? -- Thanks, LF

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LVM and Backups
by Alessandro Baggi 21 Sep '18

21 Sep '18

Hey there, I'm testing LVM snapshot to make backups and I've some questions about snapshot lvm. In my test case I have httpd, postgresql db and a dataset on a VM. Running a backup I follow this steps: 1) Stop httpd 2) Create lvm snapshot on the dataset 3) Backup database 4) restart httpd (to avoid more downtime) 5) mount the snapshot and execute backup 6) umount and remove the snapshot I think that this could be fine (if not please correct me) Now when bacula performs the backup what happen if bacula are copying a specified file and this specified file is modified? Bacula will copy the right file using inode (this will copy the wrong file?) or copy entire file located in the snapshot? Thanks in advance.

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Install qemu packages from ovirt instead of original.
by --N-- 20 Sep '18

20 Sep '18

Hi, I have a KVM server running on Centos 7.5. [root@kvm2 ~]# cat /etc/redhat-release CentOS Linux release 7.5.1804 (Core) Qemu packages are from Centos repository. [root@kvm2 ~]# rpm -qa|grep qemu libvirt-daemon-driver-qemu-3.9.0-14.el7_5.7.x86_64 qemu-img-1.5.3-156.el7_5.5.x86_64 qemu-kvm-common-1.5.3-156.el7_5.5.x86_64 ipxe-roms-qemu-20170123-1.git4e85b27.el7_4.1.noarch qemu-guest-agent-2.8.0-2.el7_5.1.x86_64 qemu-kvm-1.5.3-156.el7_5.5.x86_64 But, I want to install a new version of qemu from ovirt repositories. (This because I need live disk snapshots). So I installed ovirt yum repository, run yum update and I see qemu will be updated (as you can see below in red) Resolving Dependencies --> Running transaction check ---> Package glusterfs.x86_64 0:3.8.4-54.15.el7.centos will be updated ---> Package glusterfs.x86_64 0:3.12.14-1.el7 will be an update ---> Package glusterfs-api.x86_64 0:3.8.4-54.15.el7.centos will be updated ---> Package glusterfs-api.x86_64 0:3.12.14-1.el7 will be an update ---> Package glusterfs-cli.x86_64 0:3.8.4-54.15.el7.centos will be updated ---> Package glusterfs-cli.x86_64 0:3.12.14-1.el7 will be an update ---> Package glusterfs-client-xlators.x86_64 0:3.8.4-54.15.el7.centos will be updated ---> Package glusterfs-client-xlators.x86_64 0:3.12.14-1.el7 will be an update ---> Package glusterfs-fuse.x86_64 0:3.8.4-54.15.el7.centos will be updated ---> Package glusterfs-fuse.x86_64 0:3.12.14-1.el7 will be an update ---> Package glusterfs-libs.x86_64 0:3.8.4-54.15.el7.centos will be updated ---> Package glusterfs-libs.x86_64 0:3.12.14-1.el7 will be an update ---> Package google-chrome-stable.x86_64 0:69.0.3497.92-1 will be updated ---> Package google-chrome-stable.x86_64 0:69.0.3497.100-1 will be an update ---> Package kexec-tools.x86_64 0:2.0.15-13.el7 will be updated ---> Package kexec-tools.x86_64 0:2.0.15-13.el7_5.1 will be an update ---> Package libcacard.x86_64 40:2.5.2-2.el7 will be updated ---> Package libcacard.x86_64 40:2.5.2-2.1.el7 will be an update ---> Package pyOpenSSL.x86_64 0:0.13.1-3.el7 will be obsoleted ---> Package python-coverage.x86_64 0:3.6-0.5.b3.el7 will be obsoleted ---> Package python-dateutil.noarch 0:1.5-7.el7 will be updated ---> Package python-dateutil.noarch 1:2.4.2-1.el7 will be an update ---> Package python-netaddr.noarch 0:0.7.5-9.el7 will be updated ---> Package python-netaddr.noarch 0:0.7.18-1.el7 will be an update ---> Package python-six.noarch 0:1.9.0-2.el7 will be obsoleted ---> Package python2-coverage.x86_64 0:4.4.1-1.el7 will be obsoleting ---> Package python2-pyOpenSSL.noarch 0:16.2.0-3.el7 will be obsoleting ---> Package python2-six.noarch 0:1.10.0-9.el7 will be obsoleting ---> Package qemu-img.x86_64 10:1.5.3-156.el7_5.5 will be obsoleted ---> Package qemu-img-ev.x86_64 10:2.10.0-21.el7_5.4.1 will be obsoleting ---> Package qemu-kvm.x86_64 10:1.5.3-156.el7_5.5 will be obsoleted ---> Package qemu-kvm-common.x86_64 10:1.5.3-156.el7_5.5 will be obsoleted ---> Package qemu-kvm-common-ev.x86_64 10:2.10.0-21.el7_5.4.1 will be obsoleting ---> Package qemu-kvm-ev.x86_64 10:2.10.0-21.el7_5.4.1 will be obsoleting --> Finished Dependency Resolution Finally I did not update qemu because this KVM server has multiples VMs running and I was not sure if it could impact VMs working. My question, how can this qemu update can imapct my already running VMs? Appreciate your help. Thanks in advance. Regards Israel.

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openl2tp.org compared to openvpn
by Gregory P. Ennis 18 Sep '18

18 Sep '18

Everyone, I am needing to set up a secure channel with another office in order to pass some dicom files back and forth. The remote office is microsoft shop. I have initially looked at openvpn, but the microsoft shop has requested that we use openl2tp in that they already have this running. Since openl2tp is not part of the centos repositories, does anyone have good or bad experiences with this. Thanks -- Greg Ennis

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Firefox Issue
by Chris Olson 17 Sep '18

17 Sep '18

We have several small networks, some of which have only four systems that are usually a mix of Windows 7 and CentOS 6 and CentOS 7 machines. All of these systems are Internet connected and updated regularly when yum finds packages available. Information about one of the CentOS 6 machines is included below. This system experienced a Firefox issue. [user@computer]$ uname -a Linux computer 2.6.32-754.3.5.el6.x86_64 #1 SMP Tue Aug 14 20:46:41 UTC 2018 x86_64 x86_64 x86_64 GNU/Linux [user@computer]$ Several weeks ago, one of the Firefox updates did something unusual. It changed the browser-stored home page to https://www.centos.org/ from the original home page file:///usr/share/doc/HTML/index.html. This original home page had been in place since 2014, and had survived all Firefox updates for a little over four years. Last week, someone left one browser running and the system went into power save mode. To wake the system up we used the standard method of a quick push of the power button on the front of the Dell tower system. Although the system seemed to be running, the monitor and mouse never came to life. We also could not ssh into the system from any other computer on the network. We decided to use a steady push on the power button to shut the system down. After powering up again, the system seemed to run normally, but the browser home page was back to file:///usr/share/doc/HTML/index.html. Has anyone else experienced such an issue with Firefox recently?

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Discuss September 2018