Discuss May 2020

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98 participants
76 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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Issues booting centos7 [dracut is failing to enable centos/root, centos/swap LVs]
by Yannis Milios 01 Feb '25

01 Feb '25

Hello, I'm having a strange problem booting a new centos7 installation. Below some background on this. [I have attached the tech details at the bottom of this message] I started a new CentOS7 installation on a VM, so far all good, o/s boots fine. Then I decided to increase VM disk size (initially was 10G) to 13G. Powered off the VM, increased the vhd via the hypervisor, booted from CentOS livecd, selected "recover my centos installation". Then I used the following sequence of commands to make the new vhd size "visible" to the o/s ... - ran fdisk /dev/sda and deleted partition 2. (This is the LVM partition where the o/s is stored. The first partition is /boot [xfs] partition *non lvm*.) - created a new partition with same starting sector as before deleting it, but a different ending sector (to reflect to the increased space). - set partition type to 8e (lvm), saved settings and exit. - ran pvresize and lvresize to make new space visible to the o/s.All good, I can see the space increase on 'lvdisplay centos/root'. - ran 'mount /dev/mapper/centos-root /mnt/root' to temporarily mount the o/s partition. - ran 'xfs_growfs /mnt/root' to resize the o/s fs to the new size. It was successful and I could actually chroot to the o/s and verify new disk size. - rebooted and tried to boot from hdd this time. Grub menu shows up and loads default kernel (3.10.0-862.9.1.el7.x86_64). - after initial kernel boot up process, booting continues to initrd and then it's where the problem starts... - looks like dracut has issues locating/enabling /dev/mapper/centos-root (lv) and as a result it cannot boot to the 'real' root fs (/). - while in dracut shell, I execute the following command sequence: 1. lvm lvchange -ay /dev/centos/root 2. lvm lvchange -ay /dev/centos/swap 3. ln -s /dev/mapper/centos-root /dev/root 4. exit ...and the o/s boots fine...so looks like the pv,vg,lv is detected properly while in initrd, but somehow dracut has difficulties enabling the root,swap LVs ? - While in o/s, I rebuild initrd by using: 'dracut -f -v -a lvm' Note, I have to use '-a lvm' as for some reason, if don't, the lvm utils (lvm,lvm_scan) are not being included to the initrd, not sure why this happens. After rebooting, same thing happens, I have to manually boot the system via dracut shell. I'm a bit stuck at this point, any clues what I'm doing wrong in here ? As I previously said, this is a new installation, so I could simply reinstall the whole thing, but I would rather try to find out some answer to why is this happening ... :-) [curiosity] Some additional details: ================== I've attached /run/initramfs/rdsosreport.txt file [generated while in inird] here: https://privatebin.net/?fdc4052c0c402884#gdB/QYR3IeR55SxUbjfrkZPQfJ7jMxiUxq… o/s ver=CentOS Linux release 7.5.1804 (Core) [root@localhost ~]# lsblk NAME MAJ:MIN RM SIZE RO TYPE MOUNTPOINT sda 8:0 0 13G 0 disk ├─sda1 8:1 0 500M 0 part /boot └─sda2 8:2 0 12.5G 0 part ├─centos-root 253:0 0 11.5G 0 lvm / └─centos-swap 253:1 0 1G 0 lvm [SWAP] [root@localhost ~]# cat /etc/default/grub GRUB_TIMEOUT=5 GRUB_DISTRIBUTOR="$(sed 's, release .*$,,g' /etc/system-release)" GRUB_DEFAULT=saved GRUB_DISABLE_SUBMENU=true GRUB_TERMINAL_OUTPUT="console" GRUB_CMDLINE_LINUX="rd.lvm.lv=centos/root rd.lvm.lv=centos/swap rd.shell rhgb" GRUB_DISABLE_RECOVERY="true"

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MATE 1.20 test build for CentOS 7 available
by Greg Bailey 14 Oct '21

14 Oct '21

Hi everyone, There's been discussions in the past about updating MATE RPMs in EPEL-7: https://bugzilla.redhat.com/show_bug.cgi?id=1436260 https://lists.centos.org/pipermail/centos/2019-August/173154.html (and lots of others...) As a proof-of-concept, I've written some scripts that clone specific commits from the Fedora master branches, and then runs a tool to re-apply RPM scriptlets that are required by EL7 but removed from the Fedora .spec files. The scripts are available at: https://github.com/gebailey/mate-rpms/tree/master/1.20/el7 There's also instructions there if you want to try upgrading to MATE 1.20 w/o rebuilding them yourself. If these packages work for others, perhaps we can revisit the idea of updating the epel7 branches of the Fedora git repos and submitting an official update. There's nothing here (yet) about building MATE 1.22 (which might require a newer gcc for EL7), or building anything on CentOS 8, but thought the CentOS 7 users might find this helpful. -Greg

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LibreOffice locking up
by H 07 Nov '20

07 Nov '20

I am running LibreOffice 5.3.6.1 under the latest update of CentOS 7 and the Mate desktop. Not infrequently LibreOffice Calc locks up and I have to force close the application. Altough the spreadsheet is rather large I would not consider it complex. This has been going on for some time and I am curious if the bug might be in LibreOffice or if there is some interaction with the Mate desktop that might be responsible. Both CentOS, LibreOffice and Mate have been regularly updated from the standard repositories for a long time. Does anyone else have the same problem?

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CentOS7 and NFS
by Patrick Bégou 28 Aug '20

28 Aug '20

Hi, I need some help with NFSv4 setup/tuning. I have a dedicated nfs server (2 x E5-2620 8cores/16 threads each, 64GB RAM, 1x10Gb ethernet and 16x 8TB HDD) used by two servers and a small cluster (400 cores). All the servers are running CentOS 7, the cluster is running CentOS6. Time to time on the server I get: kernel: NFSD: client xxx.xxx.xxx.xxx testing state ID with incorrect client ID And the client xxx.xxx.xxx.xxx freeze whith: kernel: nfs: server xxxxx.legi.grenoble-inp.fr not responding, still trying kernel: nfs: server xxxxx.legi.grenoble-inp.fr OK kernel: nfs: server xxxxx.legi.grenoble-inp.fr not responding, still trying kernel: nfs: server xxxxx.legi.grenoble-inp.fr OK There is a discussion on RedHat7 support about this but only open to subscribers. Other searches with google do not provide useful information. Do you have an idea how to solve these freeze states ? More generally I would be really interested with some advice/tutorials to improve NFS performances in this dedicated context. There are so many [different] things about tuning NFS available on the web that I'm a little bit lost (the opposite of the previous question). So if some one has "the tutorial"...;-) Thanks Patrick

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Brother HL-L2360DW printing quality
by H 23 Jul '20

23 Jul '20

I have the above printer but have not been able to resolve issues with the printing quality in CentOS 7. The test page prints fine but when I print PDF-documents, most recently using Chinese fonts, it is lacking and the pages very hard to read. The settings in the Mate Cups configuration panel are fine and set to 600 dpi, the settings in the printer menu are all OK yet it prints more like maybe 150 or even 75 dpi. Any suggestion what might be wrong?

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Where can I find centos-release-8.1-1.1911.0.9.el8.src.rpm
by me＠tdiehl.org 01 Jun '20

01 Jun '20

Hi, I am looking for centos-release-8.1-1.1911.0.9.el8.src.rpm. Does anyone know where to find it. The only thing I see in vault is centos-release-8.1-1.1911.0.8.el8.src.rpm. Regards, -- Tom me(a)tdiehl.org

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docker-firewalld
by Thomas Stephen Lee 31 May '20

31 May '20

Hi, https://fedoraproject.org/wiki/Changes/firewalld_default_to_nftables mentions a docker-firewalld where can I find that package or source code? thanks --- Lee

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looking for ideas about how to create a constant data stream
by hw＠gc-24.de 30 May '20

30 May '20

Hi, I'm looking for a good way to create a constant data stream that will occupy a bandwidth of about 2--5Mbit/sec between two remote hosts over the internet. I have full access to the hosts involved. My first attempt to use scp to copy data from /dev/null on host A to /dev/null on host B, but scp says '/dev/null: not a regular file'. If something like that would work, I would be able to limit the bandwidth of this transfer in the router(s) involved so that it won't occupy all the bandwidth. Of course, it would be better if I could limit the bandwidth on the sending side rather than dropping packages. I could probably write some program to do that, but since I have never programmed such a kind of network application, it would be rather time consuming. Maybe there's already a kind of tool around that can do this. I need this to work around whatever settings my ISP has made 3 days ago that block my VPN connection so that I effectively can't reasonably work anymore. I do know what the problem with the connection is and that occupying some bandwidth would unblock the VPN; only there doesn't seem to be anything else I could about it.

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Re: [CentOS] Recover from an fsck failure
by James B. Byrne 29 May '20

29 May '20

On Thu, May 28, 2020 19:38, Robert Nichols wrote: > What output do you get from: > > file -s /dev/mapper/vg_voinet01-lv_log > lsblk -f /dev/mapper/vg_voinet01-lv_log > file -s /dev/mapper/vg_voinet01-lv_log /dev/mapper/vg_voinet01-lv_log: symbolic link TO '../DM-5' dm-f lsblk -f /dev/mapper/vg_voinet01-lv_log NAME FSTYPE LABEL UUID MOUNTPOINT vg_voinet01-lv_log (dm-5) The cloned source is a CentOS-6.6 based FreePBSX appliance using lvm. It has a single 500GB HDD. The source host is running and testing of its HDD shows no errors from the test. However, the number of recoverable read and write errors are abnormally high indicating that the HDD is approaching the end of its service life. I wish to replace it without having to rebuild the entire PBX system from scratch. All of the LVMs on the cloned HDD are ext4 file systems. The only one that failed is the log partition /var/log. If I cannot fix this then I wish to replace it with an empty fs and simply rsync the contents of /var/log from the running system to it. I need to do this anyway just prior to replacement as the PBX is running. However, it is about six years since I last had to do this and while I have my notes I would appreciate a short precis of the steps involved. This is the file system layout. /etc/fstab /dev/mapper/vg_voinet01-lv_root / ext4 defaults 1 1 UUID=302ab0fo-f985-4903-86e2-e218b1345e0 /boot ext4 defaults 1 2 /dev/mapper/vg_voinet01-lv_home /home ext4 defaults 1 2 /dev/mapper/vg_voinet01-LogVol04 /var ext4 defaults 1 2 /dev/mapper/vg_voinet01-lv_log /var/log ext4 defaults 1 2 /dev/mapper/vg_voinet01-lv_spool /var/spool ext4 defaults 1 2 /dev/mapper/vg_voinet01-lv_swap swap swap defaults 0 0 tmpfs /dev/shm tmpfs defaults,nodev,. . . parted -l Model: ATA WDC WD1002FAEX-0 (scsi) Disk /dev/sda: 1000GB Sector size (logical/physical): 512B/512B Partition Table: msdos Number Start End Size Type File system Flags 1 1094kB 525MB 524MB primary ext4 boot 2 525MB 500GB 500GB primary lvm Model: Linux device-maper (linear) (dm) Disk: /dev/mapper/vg_voinet01-lv_spool: 68.7GB Sector size (logical/physical): 512B/512B Partition Table: loop Number Start End Size Type File system Flags 1 0.00B 68.7GB 68.7GB primary ext4 Error: /dev/mapper/vg_voinet01-lv_log: unrecognized disk label Model: Linux device-maper (linear) (dm) Disk: /dev/mapper/vg_voinet01-lv_home: 3355MB Sector size (logical/physical): 512B/512B Partition Table: loop Number Start End Size Type File system Flags 1 0.00B 3355MB 3355MB primary ext4 Model: Linux device-maper (linear) (dm) Disk: /dev/mapper/vg_voinet01-LogVol04: 336GB Sector size (logical/physical): 512B/512B Partition Table: loop Number Start End Size Type File system Flags 1 0.00B 336GB 336GB primary ext4 Error: /dev/mapper/vg_voinet01-lv_swap: unrecognized disk label Model: Linux device-maper (linear) (dm) Disk: /dev/mapper/vg_voinet01-lv_spool: 67.1GB Sector size (logical/physical): 512B/512B Partition Table: loop Number Start End Size Type File system Flags 1 0.00B 67.1GB 67.1GB primary ext4 I will have to do this from a live cd I presume as the shell that the failed boot process dropped me into give a "File-based locking initialisation failed." when I try to run vgdisplay or vgs. Any guidance appreciated. -- *** 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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Discuss May 2020