Re: CentOS 8 Ussuri can't launch instance /usr/libexec/qemu-kvm: Permission denied
oliver.weinmann at me.com
Wed Nov 11 15:49:01 UTC 2020
sorry to pick up this old post again but I manged to figure out what's wrong. The error:
end Kernel panic - not syncing: VFS: Unable to mount root fs on unknown-block(0,0)
only arises when using the nano flavor:
openstack flavor create --id 0 --vcpus 1 --ram 64 --disk 1 m1.nano
It works fine when using 128 instead of 64MB RAM:
openstack flavor create --id 0 --vcpus 1 --ram 128 --disk 1 m1.nano
Am 19. Oktober 2020 um 16:21 schrieb Oliver Weinmann <oliver.weinmann at me.com>:
Ok, I will try to disable selinux and deploy one more compute node. I just stumbled across another issue, not sure if it is related. The instance seems to be deployed just fine but now I looked on the console and neither cirros nor centos 7 seem to be booting up correctly.
on cirros i see an error:
[ 0.846019] ---[ end Kernel panic - not syncing: VFS: Unable to mount root fs on unknown-block(0,0) ]---
and on centos7:
error: not a correct XFS inode.
I tried to create with ephemeral and volume.
Am 19. Oktober 2020 um 16:09 schrieb Alex Schultz <aschultz at redhat.com>:
On Mon, Oct 19, 2020 at 7:59 AM Oliver Weinmann <oliver.weinmann at me.com> wrote:
First of all thanks a lot for the quick reply.
I just checked and it seems that the package is really not available for centos8 from the upstream repo:
When you say it should be available via rdo, does this mean I have to add or use a different repo when deploying undercloud / overcloud? I have followed the tripleo guide to deploy it:
I thought we shipped it, maybe we don't because we run with selinux
disabled so it doesn't show up in CI.
And is there a way to disable selinux on all overcloud nodes by default? I guess it is the default to disable it?
Set the following in an environment file as part of the deployment:
Am 19. Oktober 2020 um 15:29 schrieb Alex Schultz <aschultz at redhat.com>:
On Mon, Oct 19, 2020 at 7:09 AM Oliver Weinmann <oliver.weinmann at me.com> wrote:
I have successfully deployed the overcloud many many times, but this time I have a strange behaviour. Whenever I try to launch an instance it fails. I checked the logs on the compute node and saw this error:
Failed to build and run instance: libvirt.libvirtError: internal error: process exited while connecting to monitor: libvirt: error : cannot execute binary /usr/libexec/qemu-kvm: Permission denied
googling led me to the solution to disable selinux:
I have not made this change persistent yet, as I would like to know why I'm facing this issue right now. What is actually the default for the overcloud nodes SeLinux? Enforcing, permissive or disabled? I build the ipa and overcloud image myself as I had to include drivers. Is this maybe the reason why SeLinux is now enabled, but is actually disabled when using the default ipa images?
From a TripleO perspective, we do not officially support selinux
enabled when running with CentOS. In theory it should work, however
it is very dependent on versions. I think you're likely running into
an issue with the correct version of podman which is likely causing
this. We've had some issues as of late which require a very specific
version of podman in order to work correctly with nova compute when
running with selinux enabled. You need 1.6.4-15 or higher which I
don't think is available with centos8. It should be available via
Thanks and Best Regards,
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