Discuss December 2017

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82 participants
60 discussions

SSD for Centos SWAP /tmp & /var/ partition
by Keith Roberts 03 Sep '25

03 Sep '25

Has anyone actually used a SSD in a Centos setup? My little experiment with a s/h WD drive for /tmp and SWAP partitions kicked the bucket on Wednesday, when the poor WD drive caught the click-of-death. It was a s/h drive to start with and lasted about 4 months. But that was without the /var/log/ partition being written to it, as I mounted that back onto /var/log from the original drive. So I had to install another (WD) drive, and repartion it and rebuild my RPM package database, from the backed-up Packages file. That seems to be all OK now. I'm wondering if it would be a good idea to use a new SSD for moving all the disk i/o to, that Linux likes to do so often. Plus putting SWAP onto a decent SSD should speed things up somewhat. Here's a short video of a laptop fitted with a SSD drive booting macOS, compared to a similar laptop booting from the standard HDD. The laptop with the SSD boots and loads some apps in 28 seconds. The other one takes twice as long. http://eshop.macsales.com/shop/SSD/OWC/Mercury_Extreme_Pro_6G/?utm_source=t… Kind Regards, Keith Roberts ----------------------------------------------------------------- Websites: http://www.karsites.net http://www.php-debuggers.net http://www.raised-from-the-dead.org.uk All email addresses are challenge-response protected with TMDA [http://tmda.net] -----------------------------------------------------------------

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/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 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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kmod c74 broken: howto report it
by Stijn De Weirdt 14 Feb '18

14 Feb '18

hi all, latest kmod update 20-15.el7_4.6 is broken on our systems, while previous 20-15.el7_4.4 was working fine (and downgrading fixes the issue). the issue is with modules from mellanox kmod rpms that are symlinked in the weak-updates dir. the config files in /etc/depmod.d look ok (and do work with previous version): dist.conf has weak-updates after built-in, and mellanox kmod rpms ship a config that overrides it for all modules. anyhow, before i try to get this upstream, how do i report this with centos team (to make sure the centos kmod rpm was correctly build). (i have already asked here before how to properly report it, but can't find my previous mail ;) stijn

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Announcement: 32 bit Wine repo for RHEL and CentOS 7
by Richard Grainger 23 Jan '18

23 Jan '18

Hi all I've created a yum repo for 32 bit wine packages on RHEL and CentOS 7: https://harbottle.gitlab.io/wine32/7/i386/ The Wine packages work on both 32 bit and 64 bit RHEL/CentOS 7. There is no 32 bit version of the EPEL repo, where the standard RHEL/CentOS Wine packages can be found, so you may find this new repo useful if you need to run Windows software that requires the 32 bit version of Wine. The packages are all built from the EPEL source RPMs. I had to tweak the spec file for wine itself slightly, but for the dependencies it's all pure rebuilds. Instructions: Code: yum -y install https://harbottle.gitlab.io/wine32/7/i386/wine32-release.rpm yum -y install wine.i686 Please give it a try and tell me what you think! It probably needs more testing.

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Re: [CentOS] OpenVPN server and firewalld
by Gianluca Cecchi 30 Dec '17

30 Dec '17

On Fri, Dec 29, 2017 at 10:32 AM, Kenneth Porter <shiva(a)sewingwitch.com> wrote: > 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? > > Hello, in case your need is not covered by the "--add-service" and/or the "--add-port" you can still use a direct rule for it. I think it should be something like this to test: firewall-cmd --direct --add-rule ipv4 filter FORWARD 0 -i tun+ -j ACCEPT Manual page and some examples with man firewalld.direct The "iptables like" rule will be added into the pre-built chain named FORWARD_direct The 0 above means it is put at top of FORWARD_direct chain. In your example appears "3" and it is not clear what are lines 1 and 2. With iptables -L command you will see: # iptables -v -L FORWARD_direct Chain FORWARD_direct (1 references) pkts bytes target prot opt in out source destination 0 0 ACCEPT all -- tun+ any anywhere anywhere # With firewall-cmd you can see with # firewall-cmd --direct --get-all-rules ipv4 filter FORWARD 0 -i tun+ -j ACCEPT # If it works ok as expected, you can make it permanent with firewall-cmd --permanent --direct --add-rule ipv4 filter FORWARD 0 -i tun+ -j ACCEPT firewall-cmd --reload HIH digging into, Gianluca

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CentOS 7 + KDE : post-installation script
by Nicolas Kovacs 29 Dec '17

29 Dec '17

Hi, I just spent two rainy days writing and fine-tuning a post-installation script for CentOS 7 and KDE. https://github.com/kikinovak/centos-7-desktop-kde I've just tested it on three different machines here, and it works quite nicely. Feel free to give it a spin and make some suggestions. 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

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Centos 7 and btrfs
by Matt 28 Dec '17

28 Dec '17

I am setting up a new test server. Doing a fresh install from CD onto a couple 4TB drives. Would like to try btrfs in a RAID 1 format. Are there any how to's on how to do that?

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Discuss December 2017