Discuss July 2018

discuss@lists.centos.org

105 participants
80 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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Centos 7 on Dell Latitude E6500
by Rainer Fügenstein 09 Oct '19

09 Oct '19

Hi, I tried to install Centos7 x86_64 minimal 1503-01 from an USB flash drive on my old Dell Latitude E6500 laptop. boots up in text mode, switches text resolution, writes: Started Show Plymouth Boot Screen Reached Target Paths Reached Target Basic System. then hangs for some time, eventually starting dracut emergency shell. log says: multipathd: sdb: spurious uevent, path already in pathvec multipathd: sda: spurious uevent, path already in pathvec interesting: sdb is the internal 240GB kingston SSD drive (existing ntfs bitlocker partition recognized as sdb1) sda is the write protected USB stick, recognised as CDROM drive. 4GB rom intel 45 express chipset mobile intel GMA 4500MHD graphics intel 5100AGN wifi what to try next? any additional infos I can give you? thnx in advance. -- Best regards, Rainer mailto:rfu@oudeis.org

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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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dmarc auth on incoming email
by Fred Smith 23 Jan '19

23 Jan '19

Just reading up on DMARC, toying with setting it up to auth against incoming emails. (but not configure my domain to use dmarc, or at least not yet) ran into an article about opendmarc, which is available on epel. but when I took a look at the opendmarc website and the git pages it doesn't appear to have been updated in several years. while I see that it is still available from epel, I wonder if anyone knows the project status? Is it still active? are there any other viable alternatives? thanks in advance! Fred -- ---- Fred Smith -- fredex(a)fcshome.stoneham.ma.us ----------------------------- The eyes of the Lord are everywhere, keeping watch on the wicked and the good. ----------------------------- Proverbs 15:3 (niv) -----------------------------

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Re: [CentOS] Mail has quit working
by TE Dukes 27 Aug '18

27 Aug '18

Third time trying respond! -------- Original Message -------- Subject: Re: [CentOS] Mail has quit working From: Gordon Messmer < <mailto:gordon.messmer@gmail.com> gordon.messmer(a)gmail.com> Date: Tue, July 24, 2018 10:31 am To: <mailto:centos@centos.org> centos(a)centos.org On 07/23/2018 03:39 PM, TE Dukes wrote: > Mail has come to an abrupt stop. Running C7, postfix and dovecot. > ... > Crond is no longer send mail. In one terminal: "tail -f /var/log/maillog" or "journalctl -f" In another, "echo test | mail -s test your(a)email.address" What do you see in the maillog at that time? What does the "df" command output? _______________________________________________ CentOS mailing list <mailto:CentOS@centos.org> CentOS(a)centos.org <https://lists.centos.org/mailman/listinfo/centos> https://lists.centos.org/mailman/listinfo/centos Thanks, Output from tail: Jul 24 10:05:02 ts130 clamd[3226]: SelfCheck: Database status OK. Jul 24 10:15:02 ts130 clamd[3226]: SelfCheck: Database status OK. Jul 24 10:25:02 ts130 clamd[3226]: SelfCheck: Database status OK. Jul 24 10:35:02 ts130 clamd[3226]: SelfCheck: Database status OK. Jul 24 10:35:59 ts130 postfix/qmgr[8283]: C33128410546: from=< <mailto:root@ts130.palmettodomains.com> root(a)ts130.palmettodomains.com>, size=949, nrcpt=1 (queue active) Jul 24 10:36:29 ts130 postfix/smtp[19763]: connect to <http://paalmettodomains.com> paalmettodomains.com[198.105.254.65]:25: Connection timed out Jul 24 10:36:59 ts130 postfix/smtp[19763]: connect to <http://paalmettodomains.com> paalmettodomains.com[104.239.198.84]:25: Connection timed out Jul 24 10:36:59 ts130 postfix/smtp[19763]: C33128410546: to=< <mailto:tdukes@paalmettodomains.com> tdukes(a)paalmettodomains.com>, relay=none, delay=13075, delays=13015/0.02/60/0, dsn=4.4.1, status=deferred (connect to <http://paalmettodomains.com> paalmettodomains.com[104.239.198.84]:25: Connection timed out) Jul 24 10:45:02 ts130 clamd[3226]: SelfCheck: Database status OK. Jul 24 10:55:02 ts130 clamd[3226]: SelfCheck: Database status OK. Jul 24 11:04:19 ts130 postfix/pickup[19912]: 55271840D734: uid=0 from=<root> Jul 24 11:04:19 ts130 postfix/cleanup[21840]: 55271840D734: message-id=< <mailto:20180724150419.55271840D734@ts130.palmettodomains.com> 20180724150419.55271840D734(a)ts130.palmettodomains.com> Jul 24 11:04:19 ts130 postfix/qmgr[8283]: 55271840D734: from=< <mailto:root@ts130.palmettodomains.com> root(a)ts130.palmettodomains.com>, size=466, nrcpt=1 (queue active) Jul 24 11:04:20 ts130 postfix/smtpd[21846]: connect from localhost[127.0.0.1] Jul 24 11:04:20 ts130 postfix/smtpd[21846]: 49161841ED92: client=localhost[127.0.0.1] Jul 24 11:04:20 ts130 postfix/cleanup[21840]: 49161841ED92: message-id=< <mailto:20180724150419.55271840D734@ts130.palmettodomains.com> 20180724150419.55271840D734(a)ts130.palmettodomains.com> Jul 24 11:04:20 ts130 postfix/qmgr[8283]: 49161841ED92: from=< <mailto:root@ts130.palmettodomains.com> root(a)ts130.palmettodomains.com>, size=951, nrcpt=1 (queue active) Jul 24 11:04:20 ts130 postfix/smtpd[21846]: disconnect from localhost[127.0.0.1] Jul 24 11:04:20 ts130 amavis[423]: (00423-03) Passed CLEAN {RelayedInbound}, [127.0.0.1] < <mailto:root@ts130.palmettodomains.com> root(a)ts130.palmettodomains.com> -> < <mailto:tdukes@palmettodomains.com> tdukes(a)palmettodomains.com>, Message-ID: < <mailto:20180724150419.55271840D734@ts130.palmettodomains.com> 20180724150419.55271840D734(a)ts130.palmettodomains.com>, mail_id: eYD2cL7fZ7rY, Hits: -0.001, size: 466, queued_as: 49161841ED92, 941 ms Jul 24 11:04:20 ts130 postfix/smtp[21842]: 55271840D734: to=< <mailto:tdukes@palmettodomains.com> tdukes(a)palmettodomains.com>, relay=127.0.0.1[127.0.0.1]:10024, delay=1, delays=0.07/0.01/0/0.94, dsn=2.0.0, status=sent (250 2.0.0 from MTA(smtp:[127.0.0.1]:10025): 250 2.0.0 Ok: queued as 49161841ED92) Jul 24 11:04:20 ts130 postfix/qmgr[8283]: 55271840D734: removed Jul 24 11:04:20 ts130 dovecot: lda(tdukes): msgid=< <mailto:20180724150419.55271840D734@ts130.palmettodomains.com> 20180724150419.55271840D734(a)ts130.palmettodomains.com>: saved mail to INBOX Jul 24 11:04:20 ts130 postfix/local[21847]: 49161841ED92: to=< <mailto:tdukes@palmettodomains.com> tdukes(a)palmettodomains.com>, relay=local, delay=0.09, delays=0.02/0.01/0/0.06, dsn=2.0.0, status=sent (delivered to command: /usr/libexec/dovecot/dovecot-lda -f "$SENDER" -a "$RECIPIENT") Jul 24 11:04:20 ts130 postfix/qmgr[8283]: 49161841ED92: removed >From df: Filesystem 1K-blocks Used Available Use% Mounted on /dev/mapper/cl-root 97605056 12762640 84842416 14% / devtmpfs 8025676 0 8025676 0% /dev tmpfs 8043100 70176 7972924 1% /dev/shm tmpfs 8043100 59284 7983816 1% /run tmpfs 8043100 0 8043100 0% /sys/fs/cgroup tmpfs 262144 0 262144 0% /var/spool/MailScanner/incoming /dev/mapper/cl-home 97605056 34632 97570424 1% /home /dev/sda2 993004 391180 601824 40% /boot /dev/mapper/cl-data 3685467928 1205578432 2479889496 33% /data /dev/sdb1 3845548044 2677536044 972662756 74% /media tmpfs 1608620 56 1608564 1% /run/user/0

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Desktop lag with CentOS7/Mate and high CPU usage
by James Pearson 02 Aug '18

02 Aug '18

We have noticed significant desktop/UI lag on CentOS7 workstations using Mate when the CPU usage is high - i.e. the mouse pointer lags and moving windows (e.g. terminal windows) become jumpy (not smooth) We didn't see (or notice) this issue with CentOS6/Gnome2 This can easily be shown by running something like 'cpuburn' (https://patrickmn.com/projects/cpuburn/) and moving a mate-terminal window around the screen We can make things 'better' by running CPU intensive apps via 'nice' (without any noticeable performance hit to the CPU intensive app) - but this is a rather messy way of fixing the issue We can also make things better by renice'ing X to a negative nice level However, both these approaches seem wrong to me - as I'm probably missing something straightforward here Does anyone know of any CentOS7/Mate settings that could be used to improve desktop/UI responsiveness with high CPU usage ? Thanks James Pearson

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ecryptfs (from centosplus) and libvirt lxc quest on it - quest upon start shoots host in the head
by lejeczek 31 Jul '18

31 Jul '18

hi guys I have a lxc guest on Dell's R815(AMD Opterons) which I just moved to an ecryptfs mounted folder(using centosplus' kernel) Copying data to that folder seems to work just fine, but I as soon as I start the quest the host gets shot in the head, hard reboot, no dump. I also have another, virtually identical guest but on Intel platform and that one does not do anything but runs okey. Any of you guys has experience such gross abnormality? many thanks, L.

1 0

Xfce vs. VirtualBox : font size problem
by Nicolas Kovacs 31 Jul '18

31 Jul '18

Hi, I'm running CentOS 7 with Xfce on my main workstation. I just installed VirtualBox, and the application is running nicely. The only problem is that VirtualBox fonts are too tiny. How can I make the application behave and use the system-wide font settings ? 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

1 0

Increase Disk Space with LVM
by Felix Kölzow 31 Jul '18

31 Jul '18

Dear CentOS-Community, we have a server with four hard drives that are configured as raid10 (/dev/sda). Now, /home and /root are almost full. Therefore, we decided to buy four additional hard drives that should configured also as raid 10 (/dev/sdb). I want to use LVM to extend disk space for root and home. My (successful) test procedure in a virtual environment looks like this: 1. devide /dev/sdb into /dev/sdb1 for root and /dev/sdb2 for home using parted 2. Convert disk to physical volume: pvcreate /dev/sdb1 3. add physical volume to volume group (called centos): vgextend centos /dev/sdb1 4. Allocate physical volume to a logical volume:lvextend -l +100$FREE /dev/centos/root 5. resize2fs /dev/centos/root or xfs_grows /dev/centos/root depending on file system used 6. repeat steps 2-6 for /home and sdb2 The mentioned instruction I've got from this page: https://askubuntu.com/questions/458476/adding-disks-with-lvm#459176 Now my question: Is this procedure really safe or is something missing or are there some steps which I overlooked actually? Kind Regards Felix Kölzow

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Discuss July 2018