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-----Original Message----- From: CentOS centos-bounces@centos.org On Behalf Of centos-request@centos.org Sent: Tuesday, July 31, 2018 5:30 PM To: centos@centos.org Subject: (EXT) CentOS Digest, Vol 162, Issue 29
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Today's Topics:
1. Issues booting centos7 [dracut is failing to enable centos/root, centos/swap LVs] (Yannis Milios) 2. Re: Issues booting centos7 [dracut is failing to enable centos/root, centos/swap LVs] (Simon Matter) 3. Re: Issues booting centos7 [dracut is failing to enable centos/root, centos/swap LVs] (Yannis Milios) 4. Re: Issues booting centos7 [dracut is failing to enable centos/root, centos/swap LVs] (mark) 5. Re: Issues booting centos7 [dracut is failing to enable centos/root, centos/swap LVs] (Yannis Milios) 6. Re: Issues booting centos7 [dracut is failing to enable centos/root, centos/swap LVs] (mark) 7. Re: Issues booting centos7 [dracut is failing to enable centos/root, centos/swap LVs] (Yannis Milios) 8. Re: Issues booting centos7 [dracut is failing to enable centos/root, centos/swap LVs] (Simon Matter) 9. Issues booting centos7 [dracut is failing to enable centos/root, centos/swap LVs] (Yannis Milios) 10. Increase Disk Space with LVM (Felix K?lzow)
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Message: 1 Date: Mon, 30 Jul 2018 16:26:43 +0100 From: Yannis Milios yannis.milios@gmail.com To: centos@centos.org Subject: [CentOS] Issues booting centos7 [dracut is failing to enable centos/root, centos/swap LVs] Message-ID: CAFiF2OpdpWuVLyZq7_4n1MxtMr2ypJkgKhLt+03ayapexgNuqA@mail.gmail.com Content-Type: text/plain; charset="UTF-8"
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/QYR3IeR55SxUbjfrkZPQfJ7jMxiUxq5...
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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Message: 2 Date: Mon, 30 Jul 2018 17:53:56 +0200 From: "Simon Matter" simon.matter@invoca.ch To: "CentOS mailing list" centos@centos.org Subject: Re: [CentOS] Issues booting centos7 [dracut is failing to enable centos/root, centos/swap LVs] Message-ID: 09679ddf131cfabaaa9a38ee3a874541.squirrel@webmail.bi.invoca.ch Content-Type: text/plain;charset=utf-8
Hi,
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.
At this point I usually reboot and do the following steps while the system is running. I don't say how you do it is wrong, it's just easier/faster to do things while the system is online if downtime matters.
I don't really know what causes your issues. The reason may be that I have more and more problems understanding the whole boot process and all the variants we used to have over more than two decades...
But, what happens if you let the kernel post install scripts do the work or setting up the initrd things? If you reinstall the latest kernel, does it change anything?
Regards, Simon
- 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/QYR3IeR55SxUbjfrkZPQfJ7jM xiUxq5DWhTVbWc=
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" _______________________________________________ CentOS mailing list CentOS@centos.org https://lists.centos.org/mailman/listinfo/centos
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Message: 3 Date: Mon, 30 Jul 2018 17:32:53 +0100 From: Yannis Milios yannis.milios@gmail.com To: centos@centos.org Subject: Re: [CentOS] Issues booting centos7 [dracut is failing to enable centos/root, centos/swap LVs] Message-ID: CAFiF2Or=a_2b+e+jj9AeUufnZg4N+rHvS8KJHF+LoBDJ+QcRNg@mail.gmail.com Content-Type: text/plain; charset="UTF-8"
But, what happens if you let the kernel post install scripts do the work or setting up the initrd things?
Initially, I just rebooted from LiveCD and left Grub,kernel and dracut do their job with the defaults, but unfortunately, boot process stops at initrd (dracut) stage with the following error:
[ 197.768159] localhost.localdomain dracut-initqueue[252]: Warning: Could
not boot. [ 197.821409] localhost.localdomain systemd[1]: Received SIGRTMIN+20 from PID 254 (plymouthd). [ 197.822328] localhost.localdomain dracut-initqueue[252]: Warning: /dev/centos/root does not exist [ 197.823044] localhost.localdomain dracut-initqueue[252]: Warning: /dev/centos/swap does not exist [ 197.846807] localhost.localdomain systemd[1]: Starting Dracut Emergency Shell... [ 197.870983] localhost.localdomain systemd[1]: Received SIGRTMIN+21 from PID 254 (plymouthd).
Then, I'm dropped to dracut shell, where I boot the system by using the lvm commands as described to my first post. Once in O/S, I re-create initrd by using 'dracut -f -v -a lvm' command and reboot again the system. But still I get the same error during boot ...
If you reinstall the latest kernel, does
it change anything?
This is actually the latest kernel (3.10.0-862.9.1.el7.x86_64) but I tried to boot with the second (older) kernel (vmlinuz-3.10.0-327.36.3.el7.x86_64), where I got exactly the same error during boot.
Clearly, this is not a kernel issue, perhaps not even a dracut (initrd) issue, since everything was working fine, before resizing the PV/LV. I suspect that something went wrong during that step, but what? As I can successfully boot the system manually via dracut, normally everything should be ok? no?
What can prevent dracut from activating the 2 LVs (centos/root and centos/swap) during initial boot phase ?
Thanks, Yannis
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Message: 4 Date: Mon, 30 Jul 2018 15:13:08 -0400 From: "mark" m.roth@5-cent.us To: "CentOS mailing list" centos@centos.org Subject: Re: [CentOS] Issues booting centos7 [dracut is failing to enable centos/root, centos/swap LVs] Message-ID: e9796451bea645de4bc4fbe210591182.squirrel@host290.hostmonster.com Content-Type: text/plain;charset=utf-8
Yannis Milios wrote:
But, what happens if you let the kernel post install scripts do the work or setting up the initrd things?
Initially, I just rebooted from LiveCD and left Grub,kernel and dracut do their job with the defaults, but unfortunately, boot process stops at initrd (dracut) stage with the following error:
[ 197.768159] localhost.localdomain dracut-initqueue[252]: Warning: Could
not boot. [ 197.821409] localhost.localdomain systemd[1]: Received SIGRTMIN+20 from PID 254 (plymouthd). [ 197.822328] localhost.localdomain dracut-initqueue[252]: Warning: /dev/centos/root does not exist [ 197.823044] localhost.localdomain dracut-initqueue[252]: Warning: /dev/centos/swap does not exist [ 197.846807] localhost.localdomain systemd[1]: Starting Dracut Emergency Shell... [ 197.870983] localhost.localdomain systemd[1]: Received SIGRTMIN+21 from PID 254 (plymouthd).
Then, I'm dropped to dracut shell, where I boot the system by using the lvm commands as described to my first post. Once in O/S, I re-create initrd by using 'dracut -f -v -a lvm' command and reboot again the system. But still I get the same error during boot ...
If you reinstall the latest kernel, does
it change anything?
This is actually the latest kernel (3.10.0-862.9.1.el7.x86_64) but I tried to boot with the second (older) kernel (vmlinuz-3.10.0-327.36.3.el7.x86_64), where I got exactly the same error during boot.
Clearly, this is not a kernel issue, perhaps not even a dracut (initrd) issue, since everything was working fine, before resizing the PV/LV. I suspect that something went wrong during that step, but what? As I can successfully boot the system manually via dracut, normally everything should be ok? no?
What can prevent dracut from activating the 2 LVs (centos/root and centos/swap) during initial boot phase ?
Suggestion: once it's up, rebuild the initramfs.
mark
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Message: 5 Date: Mon, 30 Jul 2018 22:14:44 +0100 From: Yannis Milios yannis.milios@gmail.com To: CentOS mailing list centos@centos.org Subject: Re: [CentOS] Issues booting centos7 [dracut is failing to enable centos/root, centos/swap LVs] Message-ID: CAFiF2OrJUiNh35M6PBxe=CQrtF1dRYb14b5H4pewTX-EsSm-TA@mail.gmail.com Content-Type: text/plain; charset="UTF-8"
Suggestion: once it's up, rebuild the initramfs.
I tried that already, but still the same problem. Aparently dracut does not want to activate the LVs required to boot to the root filesystem, for some reason ...
Yannis
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Message: 6 Date: Mon, 30 Jul 2018 17:16:51 -0400 From: "mark" m.roth@5-cent.us To: "CentOS mailing list" centos@centos.org Subject: Re: [CentOS] Issues booting centos7 [dracut is failing to enable centos/root, centos/swap LVs] Message-ID: ce2b2fbed114eda6c7159b25098d48d1.squirrel@host290.hostmonster.com Content-Type: text/plain;charset=utf-8
Yannis Milios wrote:
Suggestion: once it's up, rebuild the initramfs.
I tried that already, but still the same problem. Aparently dracut does not want to activate the LVs required to boot to the root filesystem, for some reason ...
At this point, I'd start wondering about the grub2 defaults, and the kernel command line.
mark
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Message: 7 Date: Mon, 30 Jul 2018 23:06:15 +0100 From: Yannis Milios yannis.milios@gmail.com To: CentOS mailing list centos@centos.org Subject: Re: [CentOS] Issues booting centos7 [dracut is failing to enable centos/root, centos/swap LVs] Message-ID: CAFiF2Or5Ave-rhSCMmcD-h7X-sbhGsAGRG6psc0=jxdma7rN5g@mail.gmail.com Content-Type: text/plain; charset="UTF-8"
On Monday, July 30, 2018, mark m.roth@5-cent.us
At this point, I'd start wondering about the grub2 defaults, and the kernel command line.
This is Grub config..
[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"