2

My VPS machine refuses to boot. There is an short error according to KVM console:

Kernel panic — not syncing: VFS: Unable to mount root fs on unknown—block(0,0)
Pid: 1, comm: swapper Not tainted 2.6.32-431.11.2.el6.x86_64 #1

I can boot only with rescue mode (it's online VPS machine). I tried to follow similar topics but with no result.

Screen shot of full console errors down below:

image

Please let me know if I missed some extra info to resolve this problem.

This is CentOS 7, before my machine crashed (suddenly just hang up) I put those commands 

vim /etc/sysconfig/selinux
SELINUX=disabled

(Which is already enabled again - no result)

systemctl enable iptables
systemctl start iptables
iptables -F

Followed by:

iptables -t nat -A POSTROUTING -s 192.168.200.024 -o eth0 -j MASQUERADE

And then my machine hangs up for good.

techraf
  • 4,343
Damian Bartelmus
  • 101

2 Answers2

1

After connecting through rescue mode and doing chroot command (more or less like this: https://community.rackspace.com/products/f/25/t/69) I was able to launch

Yum update kernel

I'm pretty sure that was Grub2 fault because I was missing on one file from kernel in /boot/.

My server is up and running, but httpd service is still dead. Thanks anyway community, greetings.

Damian Bartelmus
  • 101
0

It could be your /boot drive is full and you need to delete old kernels to free up space. There is an article how to do it in Ubuntu here https://jasoncoltrin.com/?p=1710 Or pretty much you need to boot into advanced boot loader, boot with an older kernel, and then remove the old kernels.

JasonC
  • 196
  • 6
  • 15
  • your link doesn't work – Damian Bartelmus Mar 04 '17 at 00:31
  • sorry here you go https://jasoncoltrin.com/2017/01/13/fix-ubuntu-when-the-os-will-not-boot-kernel-panic-kernel-panic-not-syncing-vfs-unable-to-mount-root-fs-on-unknown-block-0-0-error-boot-full-remove-old-kernels-from-command-line/ – JasonC Mar 05 '17 at 01:43