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Paul R. Ganci

2016-Oct-30 20:53 UTC

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

On 10/30/2016 12:26 PM, Paul R. Ganci wrote:> <snip>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-blocks        Used Available   
Use%   Mounted on
/dev/mapper/live-rw           2030899    949022    1077781     47% /
devtmpfs                           2004040              0 2004040       
0%   /dev
tmpfs                                 2023652              0 
2023652       0%   /dev/shm
tmpfs                                 2023652        8520 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  3894196    6904908     37% /mnt/sysimage
/dev/vda1                            508588     143516 365072     29%  
/mnt/sysimage/boot
tmpfs                                2023652               0 
2023652       0%  /mnt/sysimage/dev/shm

 > ls /mnt/sysimage
bin   boot   dev   etc   home   lib   lib64   media   misc   mnt net   
opt   proc   root    run    sbin   srv   sys    tmp   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 root    2965270  Oct  10 23:18 
System.map-3.10.0-327.36.2.el7.x86_64
-rwxr-xr-x.   1 root root    4902656  Apr    3  2015 
vmlinuz0-rescue-6494b5d98adc4f66b0cf4c19a0f6ab66
-rwxr-xr-x.   1 root root    5157936   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 (ganci at nurdog.com)
Cell: (303)257-5208

Eero Volotinen

2016-Oct-30 20:57 UTC

head link

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

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

--
Eero

2016-10-30 22:53 GMT+02:00 Paul R. Ganci <ganci at nurdog.com>:
> On 10/30/2016 12:26 PM, Paul R. Ganci wrote:
>
>> <snip>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-blocks        Used Available   Use%
>  Mounted on
> /dev/mapper/live-rw           2030899    949022    1077781     47% /
> devtmpfs                           2004040              0 2004040
>  0%   /dev
> tmpfs                                 2023652              0 2023652
>  0%   /dev/shm
> tmpfs                                 2023652        8520 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  3894196    6904908     37% /mnt/sysimage
> /dev/vda1                            508588     143516 365072     29%
> /mnt/sysimage/boot
> tmpfs                                2023652               0 2023652
>  0%  /mnt/sysimage/dev/shm
>
> > ls /mnt/sysimage
> bin   boot   dev   etc   home   lib   lib64   media   misc   mnt net
>  opt   proc   root    run    sbin   srv   sys    tmp   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 root    2965270  Oct  10 23:18
> System.map-3.10.0-327.36.2.el7.x86_64
> -rwxr-xr-x.   1 root root    4902656  Apr    3  2015
> vmlinuz0-rescue-6494b5d98adc4f66b0cf4c19a0f6ab66
> -rwxr-xr-x.   1 root root    5157936   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 (ganci at nurdog.com)
> Cell: (303)257-5208
> _______________________________________________
> CentOS mailing list
> CentOS at centos.org
> https://lists.centos.org/mailman/listinfo/centos
>

Eero Volotinen

2016-Oct-30 21:05 UTC

head link

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

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 <eero.volotinen at iki.fi>:
> A bit hard to say. Try chrooting into environment and rebuilding initrd?
>
> --
> Eero
>
> 2016-10-30 22:53 GMT+02:00 Paul R. Ganci <ganci at nurdog.com>:
>
>> On 10/30/2016 12:26 PM, Paul R. Ganci wrote:
>>
>>> <snip>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-blocks        Used Available
>>  Use%   Mounted on
>> /dev/mapper/live-rw           2030899    949022    1077781     47% /
>> devtmpfs                           2004040              0 2004040
>>  0%   /dev
>> tmpfs                                 2023652              0 2023652
>>    0%   /dev/shm
>> tmpfs                                 2023652        8520 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  3894196    6904908     37%
>> /mnt/sysimage
>> /dev/vda1                            508588     143516 365072     29%
>> /mnt/sysimage/boot
>> tmpfs                                2023652               0 2023652
>>    0%  /mnt/sysimage/dev/shm
>>
>> > ls /mnt/sysimage
>> bin   boot   dev   etc   home   lib   lib64   media   misc   mnt net
>>  opt   proc   root    run    sbin   srv   sys    tmp   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 root    2965270  Oct  10 23:18
>> System.map-3.10.0-327.36.2.el7.x86_64
>> -rwxr-xr-x.   1 root root    4902656  Apr    3  2015
>> vmlinuz0-rescue-6494b5d98adc4f66b0cf4c19a0f6ab66
>> -rwxr-xr-x.   1 root root    5157936   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 (ganci at nurdog.com)
>> Cell: (303)257-5208
>> _______________________________________________
>> CentOS mailing list
>> CentOS at centos.org
>> https://lists.centos.org/mailman/listinfo/centos
>>
>
>

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