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
[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
[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 >> > >