Discuss May 2024

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6 participants
3 discussions

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"

4 11

Phantom name server
by Dave Close 24 May '24

24 May '24

I have a CentOS stream 8 system (C8) which runs its own internal name server (BIND 9). In the past, it used an external name server on another machine but that server has been stopped. The resolv.conf file on C8 has been modified to remove the reference to the old server and NetworkManager has been restarted. However, CUPS and other programs on C8 continue to send queries to the old server, all of which eventually time out (of course). The bogus queries to the old server are answered with ICMP destination/port unreachable, confirming that the old name server is not running. But these bogus queries take time and the delays are very annoying. I've also restarted CUPS without effect. There are no references to the old server in /etc/named.conf, but there are references to the subnet it was on as there are other machines there that need to use the new name server. I haven't yet rebooted C8 but I'm prepared if necessary. Is there something else I should do before rebooting C8? Is that even likely to solve the problem? -- Dave Close, Compata, Irvine CA +1 714 434 7359 dave(a)compata.com dhclose(a)alumni.caltech.edu "Fairness is a concept that was invented so kids and idiots could participate in debates." --Dogbert

5 16

No suspend after update
by Michael B Allen 22 May '24

22 May '24

Just updated CentOS 9 Stream on a Lenovo T17 Gen 4 Intel and not it won't suspend with the following error: [ 52.604998] Restarting kernel threads ... done. [ 52.605111] OOM killer enabled. [ 52.605111] Restarting tasks ... done. [ 52.606604] random: crng reseeded on system resumption [ 52.616014] thermal thermal_zone9: failed to read out thermal zone (-61) [ 52.791625] PM: suspend exit [ 52.791733] PM: suspend entry (s2idle) [ 52.797260] Filesystems sync: 0.005 seconds [ 52.797579] Freezing user space processes ... (elapsed 0.001 seconds) done. [ 52.799127] OOM killer disabled. [ 52.799128] Freezing remaining freezable tasks ... [ 72.805437] Freezing of tasks failed after 20.006 seconds (1 tasks refusing to freeze, wq_busy=0): [ 72.805450] task:NFSv4 callback state:I stack:0 pid:2191 ppid:2 flags:0x00004000 [ 72.805453] Call Trace: [ 72.805454] <TASK> [ 72.805456] __schedule+0x21b/0x550 [ 72.805463] schedule+0x2d/0x70 [ 72.805466] nfs41_callback_svc+0x186/0x190 [nfsv4] [ 72.805508] ? __pfx_autoremove_wake_function+0x10/0x10 [ 72.805512] ? __pfx_nfs41_callback_svc+0x10/0x10 [nfsv4] [ 72.805536] kthread+0xdd/0x100 [ 72.805538] ? __pfx_kthread+0x10/0x10 [ 72.805539] ret_from_fork+0x29/0x50 [ 72.805543] </TASK> Kernel: 5.14.0-404.el9.x86_64 How do I boot the previous kernel? Holding Shift down does nothing. Pressing escape brings up some kind of emergency screen that has no options other than to "Press any key to exit". Is CentOS 9 Stream considered stable enough to use as an everyday desktop? Mike

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Discuss May 2024