Re: [CentOS] Cannot boot CentOS 7 VM after updating Host CentOS 7 Kernel

[Steven Tardy]

> On Oct 30, 2016, at 7:31 PM, Paul R. Ganci  wrote:
> 
> Now the question is how did this happen.

I've seen something similar when installing a kernel if /etc/fstab didn't match 
df. Mkinitrd bombs out leaving the system unbootable. The rescue .iso/mkinitrd 
path you followed was the fastest way to get the system up.
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Re: [CentOS] Cannot boot CentOS 7 VM after updating Host CentOS 7 Kernel

[Paul R. Ganci]

On 10/30/2016 03:05 PM, Eero Volotinen wrote:

so, Just chroot to mountpoint:

http://www.cyberciti.biz/faq/unix-linux-chroot-command-examples-usage-syntax/

chroot /mounted/path /bin/bash and then .. mkinitrd (see man page for 
documentation)

Thank you for the hint. The way I fixed this problem was to do this:

1.) Booted into linux rescue mode using the CentOS-7-x86_64-DVD-1511.iso
2.) chroot /mnt/sysimage
3.) Used nmtui to setup a network
4.) yum update (installed the 3.10.0-327-36.3.el7.x86_64 kernel)
5.) grub2-mkconfig -o /boot/grub2/grub.cfg 6.) yum reinstall 
kernel*-3.10.0-327-36.3.el7.x86_64


Step 5 was necessary because of a grubby error indicating that there was 
no suitable template. Step 6 was necessary because according to the 
googled page I found regarding step 5 indicated that the default kernel 
would not be that found in step 4. I probably could have skipped step 4 
and just done steps 5 and 6. But the VM is now up and running the latest 
kernel.


Now the question is how did this happen. My best guess is that the VM 
was unhappy when I booted the host while it was running. Is rebooting 
the host without shutting down guests first a risky thing to do?

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Paul (ga...@nurdog.com)
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Re: [CentOS] Cannot boot CentOS 7 VM after updating Host CentOS 7 Kernel

[Eero Volotinen]

so, Just chroot to mountpoint:

http://www.cyberciti.biz/faq/unix-linux-chroot-command-examples-usage-syntax/

chroot /mounted/path /bin/bash and then .. mkinitrd (see man page for
documentation)

2016-10-30 22:57 GMT+02:00 Eero Volotinen :

> A bit hard to say. Try chrooting into environment and rebuilding initrd?
>
> --
> Eero
>
> 2016-10-30 22:53 GMT+02:00 Paul R. Ganci :
>
>> On 10/30/2016 12:26 PM, Paul R. Ganci wrote:
>>
>>> I am thinking of putting the CentOS iso out and then booting the
>>> VM into it just to poke around the file system. Otherwise my other option
>>> is to just clone a twin VM on another server and then just change the
>>> networking IPs/hostname. Anybody have any other ideas as to how to debug
>>> this problem?
>>>
>> So I booted off the CentOS-7-x86_64-DVD-1511.iso and everything looks
>> just fine:
>>
>> > df
>> Filesystem 1K-blocksUsed Available
>>  Use%   Mounted on
>> /dev/mapper/live-rw   20308999490221077781 47% /
>> devtmpfs   2004040  0 2004040
>>  0%   /dev
>> tmpfs 2023652  0 2023652
>>0%   /dev/shm
>> tmpfs 20236528520 2015132
>>  1%   /run
>> tmpfs 2023652  0 2023652
>>0%  /sys/fs/cgroup
>> /dev/sr1 4227724  4227724 0   100%
>> /run/install/repo
>> tmpfs 2023652  200 2023452
>>  1%  /tmp
>> /dev/mapper/centos-root  10799104  38941966904908 37%
>> /mnt/sysimage
>> /dev/vda1508588 143516 365072 29%
>> /mnt/sysimage/boot
>> tmpfs2023652   0 2023652
>>0%  /mnt/sysimage/dev/shm
>>
>> > ls /mnt/sysimage
>> bin   boot   dev   etc   home   lib   lib64   media   misc   mnt net
>>  opt   proc   rootrunsbin   srv   systmp   usr var
>>
>> > ls -l /mnt/sysimage/boot
>> total 109424
>> -rw-r--r--.1 root root   126431  Oct 10 23:18
>> config-3.10.0-327.36.2.el7.x86_64
>> drwxr-xr-x. 2 root root   26  Oct   2  2015  grub
>> drwx--.  6 root root 104  Oct 13 02:21  grub2
>> -rw-r--r--.1 root root   40655493  Apr   3  2015
>> initramfs-0-rescue-6494b5d98adc4f66b0cf4c19a0f6ab66.img
>> -rw---.1 root root   29666884 Oct 13  01:25
>> initramfs-3.10.0-327.36.2.el7.x86_64.img
>> -rw---.1 root root   18119089  Oct 13 02:20
>> initramfs-3.10.0-327.36.2.el7.x86_64kdump.img
>> -rw-r--r--.1 root root   10190975  Dec 19  2015 initrd-plymouth.img
>> -rw-r--r--.1 root root  252739  Oct  10 23:20
>> symvers-3.10.0-327.36.2.el7.x86_64.gz
>> -rw---.1 root root2965270  Oct  10 23:18
>> System.map-3.10.0-327.36.2.el7.x86_64
>> -rwxr-xr-x.   1 root root4902656  Apr3  2015
>> vmlinuz0-rescue-6494b5d98adc4f66b0cf4c19a0f6ab66
>> -rwxr-xr-x.   1 root root5157936   Oct  10 23:18
>> vmlinuz-3.10.0-327.36.2.el7.x86_64
>>
>> So the CentOS DVD iso in linux rescue mode shows that everything is there
>> and can be mounted. I guess that means somehow either grub itself is
>> corrupted or one of the boot images. So is there a way for me to generate a
>> new initrd while booted in linux resuce mode or will re-installing grub
>> help? How would I attempt re-installing grub while booted in linux rescue
>> mode?
>>
>> --
>> Paul (ga...@nurdog.com)
>> Cell: (303)257-5208
>> ___
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>> https://lists.centos.org/mailman/listinfo/centos
>>
>
>
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Re: [CentOS] Cannot boot CentOS 7 VM after updating Host CentOS 7 Kernel

[Eero Volotinen]

A bit hard to say. Try chrooting into environment and rebuilding initrd?

--
Eero

2016-10-30 22:53 GMT+02:00 Paul R. Ganci :

> On 10/30/2016 12:26 PM, Paul R. Ganci wrote:
>
>> I am thinking of putting the CentOS iso out and then booting the VM
>> into it just to poke around the file system. Otherwise my other option is
>> to just clone a twin VM on another server and then just change the
>> networking IPs/hostname. Anybody have any other ideas as to how to debug
>> this problem?
>>
> So I booted off the CentOS-7-x86_64-DVD-1511.iso and everything looks just
> fine:
>
> > df
> Filesystem 1K-blocksUsed Available   Use%
>  Mounted on
> /dev/mapper/live-rw   20308999490221077781 47% /
> devtmpfs   2004040  0 2004040
>  0%   /dev
> tmpfs 2023652  0 2023652
>  0%   /dev/shm
> tmpfs 20236528520 2015132
>  1%   /run
> tmpfs 2023652  0 2023652
>  0%  /sys/fs/cgroup
> /dev/sr1 4227724  4227724 0   100%
> /run/install/repo
> tmpfs 2023652  200 2023452
>  1%  /tmp
> /dev/mapper/centos-root  10799104  38941966904908 37% /mnt/sysimage
> /dev/vda1508588 143516 365072 29%
> /mnt/sysimage/boot
> tmpfs2023652   0 2023652
>  0%  /mnt/sysimage/dev/shm
>
> > ls /mnt/sysimage
> bin   boot   dev   etc   home   lib   lib64   media   misc   mnt net
>  opt   proc   rootrunsbin   srv   systmp   usr var
>
> > ls -l /mnt/sysimage/boot
> total 109424
> -rw-r--r--.1 root root   126431  Oct 10 23:18
> config-3.10.0-327.36.2.el7.x86_64
> drwxr-xr-x. 2 root root   26  Oct   2  2015  grub
> drwx--.  6 root root 104  Oct 13 02:21  grub2
> -rw-r--r--.1 root root   40655493  Apr   3  2015
> initramfs-0-rescue-6494b5d98adc4f66b0cf4c19a0f6ab66.img
> -rw---.1 root root   29666884 Oct 13  01:25
> initramfs-3.10.0-327.36.2.el7.x86_64.img
> -rw---.1 root root   18119089  Oct 13 02:20
> initramfs-3.10.0-327.36.2.el7.x86_64kdump.img
> -rw-r--r--.1 root root   10190975  Dec 19  2015 initrd-plymouth.img
> -rw-r--r--.1 root root  252739  Oct  10 23:20
> symvers-3.10.0-327.36.2.el7.x86_64.gz
> -rw---.1 root root2965270  Oct  10 23:18
> System.map-3.10.0-327.36.2.el7.x86_64
> -rwxr-xr-x.   1 root root4902656  Apr3  2015
> vmlinuz0-rescue-6494b5d98adc4f66b0cf4c19a0f6ab66
> -rwxr-xr-x.   1 root root5157936   Oct  10 23:18
> vmlinuz-3.10.0-327.36.2.el7.x86_64
>
> So the CentOS DVD iso in linux rescue mode shows that everything is there
> and can be mounted. I guess that means somehow either grub itself is
> corrupted or one of the boot images. So is there a way for me to generate a
> new initrd while booted in linux resuce mode or will re-installing grub
> help? How would I attempt re-installing grub while booted in linux rescue
> mode?
>
> --
> Paul (ga...@nurdog.com)
> Cell: (303)257-5208
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Re: [CentOS] Cannot boot CentOS 7 VM after updating Host CentOS 7 Kernel

[Paul R. Ganci]

On 10/30/2016 12:26 PM, Paul R. Ganci wrote:
I am thinking of putting the CentOS iso out and then booting the 
VM into it just to poke around the file system. Otherwise my other 
option is to just clone a twin VM on another server and then just 
change the networking IPs/hostname. Anybody have any other ideas as to 
how to debug this problem?
So I booted off the CentOS-7-x86_64-DVD-1511.iso and everything looks 
just fine:


> df
Filesystem 1K-blocksUsed Available   
Use%   Mounted on

/dev/mapper/live-rw   20308999490221077781 47% /
devtmpfs   2004040  0 2004040   
0%   /dev
tmpfs 2023652  0 
2023652   0%   /dev/shm
tmpfs 20236528520 2015132   
1%   /run
tmpfs 2023652  0 
2023652   0%  /sys/fs/cgroup
/dev/sr1 4227724  4227724 0   100%  
/run/install/repo
tmpfs 2023652  200 2023452   
1%  /tmp

/dev/mapper/centos-root  10799104  38941966904908 37% /mnt/sysimage
/dev/vda1508588 143516 365072 29%  
/mnt/sysimage/boot
tmpfs2023652   0 
2023652   0%  /mnt/sysimage/dev/shm


> ls /mnt/sysimage
bin   boot   dev   etc   home   lib   lib64   media   misc   mnt net   
opt   proc   rootrunsbin   srv   systmp   usr var


> ls -l /mnt/sysimage/boot
total 109424
-rw-r--r--.1 root root   126431  Oct 10 23:18 
config-3.10.0-327.36.2.el7.x86_64

drwxr-xr-x. 2 root root   26  Oct   2  2015  grub
drwx--.  6 root root 104  Oct 13 02:21  grub2
-rw-r--r--.1 root root   40655493  Apr   3  2015 
initramfs-0-rescue-6494b5d98adc4f66b0cf4c19a0f6ab66.img
-rw---.1 root root   29666884 Oct 13  01:25 
initramfs-3.10.0-327.36.2.el7.x86_64.img
-rw---.1 root root   18119089  Oct 13 02:20 
initramfs-3.10.0-327.36.2.el7.x86_64kdump.img

-rw-r--r--.1 root root   10190975  Dec 19  2015 initrd-plymouth.img
-rw-r--r--.1 root root  252739  Oct  10 23:20 
symvers-3.10.0-327.36.2.el7.x86_64.gz
-rw---.1 root root2965270  Oct  10 23:18 
System.map-3.10.0-327.36.2.el7.x86_64
-rwxr-xr-x.   1 root root4902656  Apr3  2015 
vmlinuz0-rescue-6494b5d98adc4f66b0cf4c19a0f6ab66
-rwxr-xr-x.   1 root root5157936   Oct  10 23:18 
vmlinuz-3.10.0-327.36.2.el7.x86_64


So the CentOS DVD iso in linux rescue mode shows that everything is 
there and can be mounted. I guess that means somehow either grub itself 
is corrupted or one of the boot images. So is there a way for me to 
generate a new initrd while booted in linux resuce mode or will 
re-installing grub help? How would I attempt re-installing grub while 
booted in linux rescue mode?

--
Paul (ga...@nurdog.com)
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Re: [CentOS] Cannot boot CentOS 7 VM after updating Host CentOS 7 Kernel

[Eero Volotinen]

You could mount image ja rebuild initrd.

Eero

2016-10-30 20:26 GMT+02:00 Paul R. Ganci :

> On 10/30/2016 07:33 AM, FrancisM wrote:
>
>> Any error in your host logs?
>>
> Nothing obvious. I checked /var/log/messages, /var/log/libvirt/qemu,
> /var/log/libvirt/lxc & /var/log/qemu-ga. The /var/log/libvirt/lxc &
> /var/log/qemu-ga were empty. The /var/log/libvirt/qemu directory had a log
> file of interest Outgoing-CentOS-7-VM.log but nothing in it that tells me
> anything obvious.
>
>  2016-10-30 06:40:09.764+: shutting down
> 2016-10-30 06:40:16.926+: starting up libvirt version: 1.2.17,
> package: 13.el7_2.5 (CentOS BuildSystem ,
> 2016-06-23-14:23:27, worker1.bsys.centos.org), qemu version: 1.5.3
> (qemu-kvm-1.5.3-105.el7_2.7)
> LC_ALL=C PATH=/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin
> QEMU_AUDIO_DRV=spice /usr/libexec/qemu-kvm -name Outgoing-CentOS-7-VM -S
> -machine pc-i440fx-rhel7.0.0,accel=kvm,usb=off -cpu Penryn -m 4096
> -realtime mlock=off -smp 2,sockets=2,cores=1,threads=1 -uuid
> 6494b5d9-8adc-4f66-b0cf-4c19a0f6ab66 -no-user-config -nodefaults -chardev
> socket,id=charmonitor,path=/var/lib/libvirt/qemu/domain-Outg
> oing-CentOS-7-VM/monitor.sock,server,nowait -mon
> chardev=charmonitor,id=monitor,mode=control -rtc base=utc,driftfix=slew
> -global kvm-pit.lost_tick_policy=discard -no-hpet -no-shutdown -global
> PIIX4_PM.disable_s3=1 -global PIIX4_PM.disable_s4=1 -boot strict=on -device
> ich9-usb-ehci1,id=usb,bus=pci.0,addr=0x5.0x7 -device
> ich9-usb-uhci1,masterbus=usb.0,firstport=0,bus=pci.0,multifunction=on,addr=0x5
> -device ich9-usb-uhci2,masterbus=usb.0,firstport=2,bus=pci.0,addr=0x5.0x1
> -device ich9-usb-uhci3,masterbus=usb.0,firstport=4,bus=pci.0,addr=0x5.0x2
> -device virtio-serial-pci,id=virtio-serial0,bus=pci.0,addr=0x6 -drive
> file=/vm-images/centos7.0.qcow2,if=none,id=drive-virtio-disk0,format=qcow2
> -device virtio-blk-pci,scsi=off,bus=pci.0,addr=0x7,drive=drive-virti
> o-disk0,id=virtio-disk0,bootindex=1 -drive 
> if=none,id=drive-ide0-0-0,readonly=on,format=raw
> -device ide-cd,bus=ide.0,unit=0,drive=drive-ide0-0-0,id=ide0-0-0 -netdev
> tap,fd=25,id=hostnet0,vhost=on,vhostfd=27 -device
> virtio-net-pci,netdev=hostnet0,id=net0,mac=52:54:00:7b:a5:c2,bus=pci.0,addr=0x3
> -chardev pty,id=charserial0 -device isa-serial,chardev=charserial0,id=serial0
> -chardev spicevmc,id=charchannel0,name=vdagent -device
> virtserialport,bus=virtio-serial0.0,nr=1,chardev=charchannel
> 0,id=channel0,name=com.redhat.spice.0 -device usb-tablet,id=input0 -spice
> port=5900,addr=127.0.0.1,disable-ticketing,seamless-migration=on -vga qxl
> -global qxl-vga.ram_size=67108864 -global qxl-vga.vram_size=67108864
> -global qxl-vga.vgamem_mb=16 -device intel-hda,id=sound0,bus=pci.0,addr=0x4
> -device hda-duplex,id=sound0-codec0,bus=sound0.0,cad=0 -chardev
> spicevmc,id=charredir0,name=usbredir -device
> usb-redir,chardev=charredir0,id=redir0 -chardev
> spicevmc,id=charredir1,name=usbredir -device
> usb-redir,chardev=charredir1,id=redir1 -device
> virtio-balloon-pci,id=balloon0,bus=pci.0,addr=0x8 -msg timestamp=on
> char device redirected to /dev/pts/1 (label charserial0)
> main_channel_link: add main channel client
> main_channel_handle_parsed: net test: latency 0.226000 ms, bitrate
> 37925925925 bps (36168.981481 Mbps)
> red_dispatcher_set_cursor_peer:
> inputs_connect: inputs channel client create
> red_peer_receive: Connection reset by peer
> red_channel_client_disconnect: rcc=0x7f2b11db6000 (channel=0x7f2b115b6600
> type=2 id=0)
> red_peer_receive: Connection reset by peer
> red_channel_client_disconnect: rcc=0x7f2b11d71000 (channel=0x7f2b10faa000
> type=3 id=0)
> red_channel_client_disconnect: rcc=0x7f2b11d8d000 (channel=0x7f2b10f8c4e0
> type=9 id=0)
> red_channel_client_disconnect: rcc=0x7f2b11d88000 (channel=0x7f2b10f8c680
> type=9 id=1)
> red_channel_client_disconnect: rcc=0x7f2b11a33000 (channel=0x7f2b10fa2000
> type=1 id=0)
> main_channel_client_on_disconnect: rcc=0x7f2b11a33000
> red_client_destroy: destroy client 0x7f2b10f2fd00 with #channels=4
> red_dispatcher_disconnect_cursor_peer:
> red_channel_client_disconnect: rcc=0x7f2b11d6c000 (channel=0x7f2b11938000
> type=4 id=0)
> red_dispatcher_disconnect_display_peer
>
> I reboot the host while the guests were running. Is it possible the root
> file system was corrupted during the host reboot? I am thinking of putting
> the CentOS iso out and then booting the VM into it just to poke around the
> file system. Otherwise my other option is to just clone a twin VM on
> another server and then just change the networking IPs/hostname. Anybody
> have any other ideas as to how to debug this problem?
> --
> Paul (ga...@nurdog.com)
> Cell: (303)257-5208
> ___
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>
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Re: [CentOS] Cannot boot CentOS 7 VM after updating Host CentOS 7 Kernel

[Paul R. Ganci]

On 10/30/2016 07:33 AM, FrancisM wrote:

Any error in your host logs?
Nothing obvious. I checked /var/log/messages, /var/log/libvirt/qemu, 
/var/log/libvirt/lxc & /var/log/qemu-ga. The /var/log/libvirt/lxc & 
/var/log/qemu-ga were empty. The /var/log/libvirt/qemu directory had a 
log file of interest Outgoing-CentOS-7-VM.log but nothing in it that 
tells me anything obvious.


 2016-10-30 06:40:09.764+: shutting down
2016-10-30 06:40:16.926+: starting up libvirt version: 1.2.17, 
package: 13.el7_2.5 (CentOS BuildSystem , 
2016-06-23-14:23:27, worker1.bsys.centos.org), qemu version: 1.5.3 
(qemu-kvm-1.5.3-105.el7_2.7)
LC_ALL=C PATH=/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin 
QEMU_AUDIO_DRV=spice /usr/libexec/qemu-kvm -name Outgoing-CentOS-7-VM -S 
-machine pc-i440fx-rhel7.0.0,accel=kvm,usb=off -cpu Penryn -m 4096 
-realtime mlock=off -smp 2,sockets=2,cores=1,threads=1 -uuid 
6494b5d9-8adc-4f66-b0cf-4c19a0f6ab66 -no-user-config -nodefaults 
-chardev 
socket,id=charmonitor,path=/var/lib/libvirt/qemu/domain-Outgoing-CentOS-7-VM/monitor.sock,server,nowait 
-mon chardev=charmonitor,id=monitor,mode=control -rtc 
base=utc,driftfix=slew -global kvm-pit.lost_tick_policy=discard -no-hpet 
-no-shutdown -global PIIX4_PM.disable_s3=1 -global PIIX4_PM.disable_s4=1 
-boot strict=on -device ich9-usb-ehci1,id=usb,bus=pci.0,addr=0x5.0x7 
-device 
ich9-usb-uhci1,masterbus=usb.0,firstport=0,bus=pci.0,multifunction=on,addr=0x5 
-device 
ich9-usb-uhci2,masterbus=usb.0,firstport=2,bus=pci.0,addr=0x5.0x1 
-device 
ich9-usb-uhci3,masterbus=usb.0,firstport=4,bus=pci.0,addr=0x5.0x2 
-device virtio-serial-pci,id=virtio-serial0,bus=pci.0,addr=0x6 -drive 
file=/vm-images/centos7.0.qcow2,if=none,id=drive-virtio-disk0,format=qcow2 
-device 
virtio-blk-pci,scsi=off,bus=pci.0,addr=0x7,drive=drive-virtio-disk0,id=virtio-disk0,bootindex=1 
-drive if=none,id=drive-ide0-0-0,readonly=on,format=raw -device 
ide-cd,bus=ide.0,unit=0,drive=drive-ide0-0-0,id=ide0-0-0 -netdev 
tap,fd=25,id=hostnet0,vhost=on,vhostfd=27 -device 
virtio-net-pci,netdev=hostnet0,id=net0,mac=52:54:00:7b:a5:c2,bus=pci.0,addr=0x3 
-chardev pty,id=charserial0 -device 
isa-serial,chardev=charserial0,id=serial0 -chardev 
spicevmc,id=charchannel0,name=vdagent -device 
virtserialport,bus=virtio-serial0.0,nr=1,chardev=charchannel0,id=channel0,name=com.redhat.spice.0 
-device usb-tablet,id=input0 -spice 
port=5900,addr=127.0.0.1,disable-ticketing,seamless-migration=on -vga 
qxl -global qxl-vga.ram_size=67108864 -global qxl-vga.vram_size=67108864 
-global qxl-vga.vgamem_mb=16 -device 
intel-hda,id=sound0,bus=pci.0,addr=0x4 -device 
hda-duplex,id=sound0-codec0,bus=sound0.0,cad=0 -chardev 
spicevmc,id=charredir0,name=usbredir -device 
usb-redir,chardev=charredir0,id=redir0 -chardev 
spicevmc,id=charredir1,name=usbredir -device 
usb-redir,chardev=charredir1,id=redir1 -device 
virtio-balloon-pci,id=balloon0,bus=pci.0,addr=0x8 -msg timestamp=on

char device redirected to /dev/pts/1 (label charserial0)
main_channel_link: add main channel client
main_channel_handle_parsed: net test: latency 0.226000 ms, bitrate 
37925925925 bps (36168.981481 Mbps)

red_dispatcher_set_cursor_peer:
inputs_connect: inputs channel client create
red_peer_receive: Connection reset by peer
red_channel_client_disconnect: rcc=0x7f2b11db6000 
(channel=0x7f2b115b6600 type=2 id=0)

red_peer_receive: Connection reset by peer
red_channel_client_disconnect: rcc=0x7f2b11d71000 
(channel=0x7f2b10faa000 type=3 id=0)
red_channel_client_disconnect: rcc=0x7f2b11d8d000 
(channel=0x7f2b10f8c4e0 type=9 id=0)
red_channel_client_disconnect: rcc=0x7f2b11d88000 
(channel=0x7f2b10f8c680 type=9 id=1)
red_channel_client_disconnect: rcc=0x7f2b11a33000 
(channel=0x7f2b10fa2000 type=1 id=0)

main_channel_client_on_disconnect: rcc=0x7f2b11a33000
red_client_destroy: destroy client 0x7f2b10f2fd00 with #channels=4
red_dispatcher_disconnect_cursor_peer:
red_channel_client_disconnect: rcc=0x7f2b11d6c000 
(channel=0x7f2b11938000 type=4 id=0)

red_dispatcher_disconnect_display_peer

I reboot the host while the guests were running. Is it possible the root 
file system was corrupted during the host reboot? I am thinking of 
putting the CentOS iso out and then booting the VM into it just to poke 
around the file system. Otherwise my other option is to just clone a 
twin VM on another server and then just change the networking 
IPs/hostname. Anybody have any other ideas as to how to debug this problem?

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Paul (ga...@nurdog.com)
Cell: (303)257-5208
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Re: [CentOS] Cannot boot CentOS 7 VM after updating Host CentOS 7 Kernel

[Paul R. Ganci]

On 10/30/2016 06:57 AM, Steven Tardy wrote:

On Oct 30, 2016, at 3:27 AM, Paul R. Ganci  wrote:

grub> set root=(hd0,msdos2)
grub> linux (hd0,1)/vmlinuz-3.10.0-327.36.2.el7.x86_64 root=(hd0,msdos2)/
grub> initrd initrd-plymouth.img
grub> boot

Try the initrd matching the kernel
That is what I thought was strange... there is no matching initrd. The 
only one there was the one I tried. I checked all the working systems 
both hosts and guests and they all just have a initrd-plymouth.img.

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Paul (ga...@nurdog.com)
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Re: [CentOS] Cannot boot CentOS 7 VM after updating Host CentOS 7 Kernel

[FrancisM]

Any error in your host logs?

On Sunday, 30 October 2016, Steven Tardy  wrote:

>
> > On Oct 30, 2016, at 3:27 AM, Paul R. Ganci  > wrote:
> >
> > grub> set root=(hd0,msdos2)
> > grub> linux (hd0,1)/vmlinuz-3.10.0-327.36.2.el7.x86_64
> root=(hd0,msdos2)/
> > grub> initrd initrd-plymouth.img
> > grub> boot
>
> Try the initrd matching the kernel?
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Re: [CentOS] Cannot boot CentOS 7 VM after updating Host CentOS 7 Kernel

[Steven Tardy]

> On Oct 30, 2016, at 3:27 AM, Paul R. Ganci  wrote:
> 
> grub> set root=(hd0,msdos2)
> grub> linux (hd0,1)/vmlinuz-3.10.0-327.36.2.el7.x86_64 root=(hd0,msdos2)/
> grub> initrd initrd-plymouth.img
> grub> boot

Try the initrd matching the kernel?
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