This system cannot be a KVM host : The loopback mount device /dev/loop1 does not exist. Perhaps your kernel does not support loo

Submitted by yngens on Tue, 10/07/2014 - 18:46

The newly installed Cloudmin instance on CentOS 7 is giving the following error:

This system cannot be a KVM host : The loopback mount device /dev/loop1 does not exist. Perhaps your kernel does not support loopback devices?

Virtual systems cannot be created or added until this is fixed.

Can Cloudmin work on CentOS 7 at all or is it too early to switch to CentOS 7?

Status: 
Closed (fixed)

Comments

Submitted by andreychek on Tue, 10/07/2014 - 18:52

Hmm, if the "loop" module loaded? You can verify that by running this command:

modprobe loop

Also, what is the output of this command:

ls -l /dev/loop*

Submitted by yngens on Tue, 10/07/2014 - 21:06

The "modprobe loop" is returning nothing and "ls -l /dev/loop*" is showing:

crw-------. 1 root root 10, 237 Oct  7 11:41 /dev/loop-control

So there is no "/dev/loop1" that Cloudmin initially was looking for.

Anyway for some reason (probably after intsalling iptables and setting selinux to permissive mode) the error message has disappeared now, I guess Cloudmin started to work with "/dev/loop-control". Cloudmin is working now on CentOS 7, but despite is is a quite powerful server, unfortunately, very slowly. I wonder is selinux negatively effecting performance. Should I just disable Selinux completely?

Submitted by JamieCameron on Tue, 10/07/2014 - 21:14

Do you have Cloudmin 7.9 installed there? We just released it today, and it should fix this issue.

If you have an older version installed, you should see a prompt to upgrade after logging in.

Submitted by yngens on Tue, 10/07/2014 - 23:10

Ah now I see what has taken care of the issue. Yes, it is not 7.9 and no more that error message. As for performance problems I will open another private issue. So marking this as closed.