Discuss March 2018

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75 participants
54 discussions

/boot partition too small
by KM 02 Oct '19

02 Oct '19

First off - let me say I am not an administrator. I need to know if there is an easy way to increase my /boot partition. When I installed CentOS 6 after running 5, it was my oversight not to increase the /boot size. it's too small and I can't do yum updates. if it's not easy to actually increase it, is it safe to take a chunk in my root filesystem (like /new.boot or something) and just mount it as /boot from now on so it uses the space or is that not a good idea? I am sure I could easily copy the rpms/kernel stuff over to it and then unmounts the real /boot and mount this new area as /boot. Can you administrators let me know what you think of all this? Thanks in advance. KM

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Re: [CentOS] BUG: soft lockup - CPU#0 stuck for 36s! [swapper/0:0]
by KM 25 Apr '18

25 Apr '18

All,This happens on all of our CentOS 7 VMs. but as stated in the email trail, the file softlockup_thresh does not exist. Should it be added? What is the best way to get rid of this behavior. Thanks in advance and sorry if I missed something along the way.KM From: correomm <correomm(a)gmail.com> To: CentOS mailing list <centos(a)centos.org> Sent: Thursday, August 18, 2016 1:55 PM Subject: Re: [CentOS] BUG: soft lockup - CPU#0 stuck for 36s! [swapper/0:0] Yes, I tried it, but does not exists: vmguest # cat /proc/sys/kernel/softlockup_thresh cat: /proc/sys/kernel/softlockup_thresh: No such file or directory On Thu, Aug 18, 2016 at 2:06 PM, Carlos A. Carnero Delgado < carloscarnero(a)gmail.com> wrote: > 2016-08-18 12:39 GMT-04:00 correomm <correomm(a)gmail.com>: > > > This bug is reported only on the VM's with CentOS 7 running on on VMware > > ESXi 5.1. > > The vSphere performance graph shows high CPU consume and disk activity > only > > on VM's with CentOS 7. Sometimes I can not connect remotely with ssh > > (timeout error). > > > > I'm also seeing those errors in several servers, running under 5.5. > Currently investigating if this > <https://kb.vmware.com/selfservice/microsites/search. > do?language=en_US&cmd=displayKC&externalId=1009996> > has anything to do (the resource overcommit bit). > > HTH, > Carlos. > _______________________________________________ > CentOS mailing list > CentOS(a)centos.org > https://lists.centos.org/mailman/listinfo/centos > _______________________________________________ CentOS mailing list CentOS(a)centos.org https://lists.centos.org/mailman/listinfo/centos | | Virus-free. www.avg.com |

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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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USB audio on Centos-7
by Fred Smith 23 Apr '18

23 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 23 Apr '18

23 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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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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Does Huawei break the license of CentOS?
by Genghuang Wang 12 Apr '18

12 Apr '18

Hello, CentOS team and everyone who cares about CentOS, Huawei release an Euler OS, which is an distribution based on CentOS. http://developer.huawei.com/ict/en/site-euleros/euleros-introduction According to CentOS's statement, CentOS is distributed under the GPLv2 License. http://mirror.centos.org/centos/7.4.1708/os/x86_64/EULA The GPL license requires the modified version to be open-source AND release in the GPL license, as well. However, Huawei break the GPL license by close-source and replace the license with their proprietary one. How do I find it? Well, I download the so-called Euler OS from http://developer.huawei.com/ict/site-euleros/euleros/repo/yum/2.2/os/x86_64… And install it in the virtual machine. From the following path: /usr/share/euleros-release/EULA /usr/share/eula/eula/eula.en_US I find that it is NOT the GPL license, but Huawei's own license. So is Huawei breaking the license of CentOS?

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Next major version of Firefox on RHEL/CentOS ?
by James Pearson 11 Apr '18

11 Apr '18

I know CentOS don't have inside info on what Redhat may or may not do in the future - plus Redhat don't usually announce publicly what their future plans are - but on the off-chance that someone on this list may know: Does anyone know what Redhat are likely to do with the next major release of Firefox on RHEL (and hence CentOS) ? The reason I ask, is that RHEL has been supplying the 'ESR' (Extended Support Release) version of Firefox - which Mozilla supports for about a year - and RHEL moves to each new ESR version before Mozilla drops support for the previous version. Up until the current version of ESR (52), the major versions have been mostly compatible, but the next release of ESR (60) has some major changes - which include: * No support for NPAPI plugins - except for Flash - i.e. no support for plugins like Java etc * No support for XUL/XPCOM/legacy add-ons - will only support 'WebExtensions' * Requires gtk3 run-time support - which isn't available with RHEL/CentOS 6 (currently Firefox for both el6 and el7 use the gtk2 run-time libraries) I know it's a long shot, but I'm just trying to work out what changes I will need to make when ESR 52 reaches its EOL in August this year ... Thanks James Pearson

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/lib/firmware/microcode.dat update on CentOS 6
by Valeri Galtsev 05 Apr '18

05 Apr '18

Dear All, An update just brought on my CenOS 6 boxes updated microcode.dat files: /lib/firmware/microcode.dat Does anybody know off hand what (how critical) is that, as, if it is related to most famous these days trouble with CPU hardware, I will need to reboot relevant boxes to have new microcode loaded. But if it is not that critical, it can wait till next reboot. Thanks a lot and apologies for laziness (not looking into details of this particular update myself). Valeri ++++++++++++++++++++++++++++++++++++++++ Valeri Galtsev Sr System Administrator Department of Astronomy and Astrophysics Kavli Institute for Cosmological Physics University of Chicago Phone: 773-702-4247 ++++++++++++++++++++++++++++++++++++++++

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OT: Problems with NextCloud 13.0.1 under Centos7
by C. L. Martinez 31 Mar '18

31 Mar '18

Hi all, I have a strange problem with a clean NextCloud 13.0.1 install under CentOS 7 (fully patched): when I try to login with admin user immediately after setup, returns to login page without returning any error. An no errors in nginx or php log files ... I am using the following components: rh-php71 rh-mariadb102 nginx 1.12 Any idea? Many thanks.

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Discuss March 2018