[CentOS] Cannot boot CentOS 7 VM after updating Host CentOS 7 Kernel
Eero Volotinen
eero.volotinen at iki.fi
Sun Oct 30 20:57:21 UTC 2016
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
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