Discuss April 2018

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90 participants
59 discussions

VGA connectors fail to work with i915 & 3.10.0-693.21.1.el7.x86_64 kernel
by Gregory P. Ennis 25 Apr '18

25 Apr '18

Everyone, A while back I reported problems with the Intell i915 video driver in an ASUS mother board. I never found a solution, but did find a work around. It is apparent that when the VGA cable is connected during boot time the screen becomes blank and does not allow a login, but if the vga cable is disconnected and the DVI connector on the video screen and motherboard are used everything works as expected. I am posting this so that if others have the same problem they can easily bypass the problem with a DVI cable, and probably an HDMI cable, but I was not able to test the HDMI. Greg Ennis

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Will RHSA-2018:0980 hit Centos repos soon?
by Sean 24 Apr '18

24 Apr '18

Hi all, RH published the advisory 2 weeks ago, according to https://access.redhat.com/errata/RHSA-2018:0980. The main repo does not appear to have the packages noted yet - http://mirror.centos.org/centos/7/updates/x86_64/Packages/ We've been waiting on a few of these bugs to be fixed for some time. I don't mean to be impatient, just looking for an ETA. Thanks for all the great work the team does!

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Libreswan IPSec Protected GRE Tunnel & firewall-cmd
by Adam Tauno Williams 24 Apr '18

24 Apr '18

I am attempting to setup an IPSec protected GRE tunnel with a Cisco router. I believe the IPSec association is up, however I cannot move traffic over the tunnel. It is not clear how to integrate the tunnel interface (gre1) with firewall-cmd; adding the interface to trusted does not appear to 'stick'. [root@aqueduct ~]# firewall-cmd --add-interface=gre1 --zone=trusted The interface is under control of NetworkManager and already bound to 'trusted' The interface is under control of NetworkManager, setting zone to 'trusted'. [root@aqueduct ~]# firewall-cmd --list-all --zone=trusted trusted target: ACCEPT icmp-block-inversion: no interfaces: <<<< nothing ... No traffic ever appears to be received by the GRE interface. 6: gre1@NONE: <POINTOPOINT,NOARP,UP,LOWER_UP> mtu 1460 qdisc noqueue state UNKNOWN qlen 1 link/gre A.B.C.D peer X.Y.W.Z inet 10.65.1.1 peer 10.65.1.2/32 scope global gre1 valid_lft forever preferred_lft forever inet6 fe80::200:5efe:4acc:1a64/64 scope link valid_lft forever preferred_lft forever [root@aqueduct ~]# ifconfig gre1 gre1: flags=209<UP,POINTOPOINT,RUNNING,NOARP> mtu 1460 inet 10.65.1.1 netmask 255.255.255.255 destination 10.65.1.2 inet6 fe80::200:5efe:4acc:1a64 prefixlen 64 scopeid 0x20<link> unspec 4A-CC-1A-64-00-00-F0-00-00-00-00-00-00-00-00-00 txqueuelen 1 (UNSPEC) RX packets 0 bytes 0 (0.0 B) RX errors 0 dropped 0 overruns 0 frame 0 TX packets 146 bytes 12180 (11.8 KiB) TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0 -- Adam Tauno Williams <mailto:awilliam@whitemice.org> GPG D95ED383 OpenGroupware Developer <http://www.opengroupware.us/>

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OpenVPN server and firewalld
by Kenneth Porter 24 Apr '18

24 Apr '18

How do I insert the iptables rule below using firewalld? I'm moving up from CentOS 6 to 7 on an office gateway and I'm trying to get OpenVPN working to allow home workers to access PCs at the office. I've got it all working but only by manually inserting an ACCEPT rule in the FORWARD iptables chain: iptables -I FORWARD 3 -i tun+ -j ACCEPT This rule was extracted from my iptables firewall under CentOS6. The 3 puts it after the accepts for established connections and loopback connections, but before any firewalld sub-chains. With this I can connect to an internal Windows 10 system with Remote Desktop. How can I inject this rule using firewalld, either as a direct rule or as some more firewalld-approved kind of rule?

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touchpad stopped working in KDE only
by twebb 23 Apr '18

23 Apr '18

I just installed CentOS 7 on a ThinkPad T420s. All went well. Touchpad worked fine at login screen, in Gnome, and in KDE. KDE is my preferred environment, so I began customizing - including configuring the touchpad to accept "Tapping" gestures via System Settings, Input Devices, Touchpad. As soon as I hit "apply", the touchpad stopped responding to cursor movements. The touchpad buttons continue to work, just no cursor movements with touches. Touch pad is still fully functional at login prompt and in Gnome. However, cursor movements stop as soon as KDE desktop (KDE Plasma) starts. Any help would be greatly appreciated. I'm almost ready to just re-install CentOS 7 again and not mess with the touchpad settings ever again, but I figure this must be something simple. Other online solutions have not worked, which is why I'm asking here. Thanks, TW

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USB audio on Centos-7
by Fred Smith 22 Apr '18

22 Apr '18

I'm using Centos-7 on my PC, with ASUS motherboard. internal audio has always worked fine EXCEPT that I can never get audio input (for recording) to work. I want to feed audio from a phono turntable and from a cassette deck. I use a phono preamp for the turntable, or directly connect the tape deck. but either nothing, or low level with horrible distortion. so, I gave up (after years of intermittent battles) and bought a Behringer UFO202, which looks like it should work fine with Linux. It allegedly uses a TI PCM2902 chipset, which many online postings claim works fine with various flavors of Linux. This device has a USB port, a pair of line in and line out jacks, a phono jack, a headphone volume control, and a switch to change the line in to phono in. I can use headphones plugged into the UFO202 to listen to audio playing on the computer, but I cannot for the life of me figure out how to feed audio into the UFO202 (via its line in RCA jacks) and have it come out speakers or phones connected to the computer. I've poked and proded at alsamixer, the mate sound tool, and pavucontrol. No useful results. Pavucontrol, in its input section, does show the device listed, and it shows activity on its level mater when there is audio input via the line in jacks on the UFO202. Disconnect the line input and the activity ceases. (Mate sound control also lists the device, but I don't even get an indication of any input at all, as I described above for pavucontrol.) but I simply cannot figure out how to get that audio to play in any audible way. I know that USB audio input works, because I have a Plantronics USB headset with microphone that I use often to converse online, and it works nicely. (and a possibly separate issue: how the heck does one point Audacity to a USB input? Can't find anything in its UI, and there's darn little help online that is actually helpful, in this regard.) Can you sense my frustration here? I'd appreciate any help that is actually helpful,... perhaps someone who reads this actually has one of these things and has made it work? thanks in advance! Fred -- ---- Fred Smith -- fredex(a)fcshome.stoneham.ma.us ----------------------------- God made him who had no sin to be sin for us, so that in him we might become the righteousness of God." --------------------------- Corinthians 5:21 ---------------------------------

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Anyone using GQRX in Centos-7, for SDR ?
by Fred Smith 22 Apr '18

22 Apr '18

I gave myself a toy, one of those cheap USB Software Define Radios, and would like to use it on my C7 box. Having wasted some time on it, I gave up and installed Ubuntu on a USB HD so I can boot that to play with SDR. The Ubuntu GQRX installation is well documented and went off without a hitch. but I just hate having to boot something else on my main box (partly because it also runs a mailserver for my personal domain, partly because, well, I just want my box running CentOS, not Ubuntu.) Searching through SDR info on line I see someone has documented installing all the bits for C6, but I suspect the process is different for C7. BTW, I installed the various bits I could find from, er, I think some came from li.nux.ro, some perhaps from epel, on C7, but couldn't get them to properly function. Worse, when the USB radio is unplugged from the system, it locks up hard. then a few days ago, I had been playing with it using the UBUNTU install, did a reboot and for kicks fired up the GQRX on Centos, and lo and behold it worked! I tried running it on Centos yesterday and it reverted to type, i.e., lock up hard. I suspect that Ubuntu is leaving some hardware in a state that allows it to work on a subsequent Centos boot (without poweroff), but no clue what. So, if anyone can point me to how to use it on C7, I'd greatly appreciate it. thanks in advance! Fred -- ---- Fred Smith -- fredex(a)fcshome.stoneham.ma.us ----------------------------- Show me your ways, O LORD, teach me your paths; Guide me in your truth and teach me, for you are God my Savior, And my hope is in you all day long. -------------------------- Psalm 25:4-5 (NIV) --------------------------------

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question re: ls oddity
by Fred Smith 20 Apr '18

20 Apr '18

Hi all! I use Centos-7 all the time. I also have a Fedora-26 VM that I use only occasionally. Today I noticed that ls on the two systems gives different results when listing the same (networked) directory. the one on fedora 26 shows files with spaces in the names like this: 'CHURCH FAMILY ADDRESS AND PHONE LIST.doc' whereas the one on Centos shows it without the quotes. both systems have the same alias for ls I don't see anything based on a brief excursion of the respective man pages. the one on Centos is version 8.22, and the one on F26 is 8.27, so unless there is some dotfile somewhere that ls refers to for options, this must be a version-change. it seems like a possibly useful feature, one might be able to use that to avoid nasty quoting problems in shellscripts, for instance. Anybody know how that gets enabled? thanks! -- ---- Fred Smith -- fredex(a)fcshome.stoneham.ma.us ----------------------------- "Not everyone who says to me, 'Lord, Lord,' will enter the kingdom of heaven, but only he who does the will of my Father who is in heaven." ------------------------------ Matthew 7:21 (niv) -----------------------------

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tftpd server S not responding
by Asif Iqbal 19 Apr '18

19 Apr '18

I have a tftpd server S running on centos 7 and managed by systemd It is not respoding to A server which is sending the tftp read request RRQ. I do see the RRQ packets coming from A to S, but S never responds back from a different port Y to A So this part is working fine https://en.wikipedia.org/wiki/Trivial_File_Transfer_Protocol#/media/File:Tf… But I do not see any attempts to even send a data packet back in my packet capture running on S So this event is not occuring, as if my tftpd server is dead. I have the firewalld turned off on S to eliminate the possibility that firewalld blocking those packets from reeaching to tftpd daemon. I also turned off selinux to eliminate any permission issue. https://en.wikipedia.org/wiki/Trivial_File_Transfer_Protocol#/media/File:Tf… I do have tftpd running and managed by systemd $ systemctl status -l tftp ● tftp.service - Tftp Server Loaded: loaded (/etc/systemd/system/tftp.service; indirect; vendor preset: disabled) Active: active (running) since Wed 2018-03-28 18:57:42 UTC; 1min 44s ago Docs: man:in.tftpd Main PID: 1685 (in.tftpd) Memory: 136.0K CGroup: /system.slice/tftp.service └─1685 /usr/sbin/in.tftpd --verbose --verbosity 10 --secure /tftpboot --port-range 4069:4169 Mar 28 18:57:42 S.example.net systemd[1]: Started Tftp Server. Mar 28 18:57:42 S.example.net systemd[1]: Starting Tftp Server... Any help is appreciated! -- Asif Iqbal PGP Key: 0xE62693C5 KeyServer: pgp.mit.edu A: Because it messes up the order in which people normally read text. Q: Why is top-posting such a bad thing?

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Enterprise company using CentOS
by Mats Bennsäter 19 Apr '18

19 Apr '18

Hi all We are about to create a business case for migrate RHEL to CentOS for all or a subset of our RHEL holdings. I have two questions that I hope to get help answering. 1. I want to get in touch with a company that have done this journey on an Enterprise company. 2. Suggestion/recommendation of vendors that can provide support for CentOs. Scop: North Europe Number of RHEL +8.000 Support 24x7 Thanks //mats

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Discuss April 2018