Home / server / Questions / 795741
In Process
Damian Bartelmus
Asked: 2016-08-10 03:55:50 +0800 CST

not syncing: VFS: Unable to mount root fs on unknown—block(0,0)

  • 772

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.

centos7

2 Answers

  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.

    • 1

  2. 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.

    • 0