2:15 p.m.
Hello,
I created an Ubuntu 16.04 Xenial guest using virt-builder(1) with
# virt-builder ubuntu-16.04
-o /var/lib/libvirt/images/ubuntu-16.04.qcow2
--size 10G --format qcow2
--firstboot-command 'dpkg-reconfigure openssh-server'
--arch x86_64
And imported it to libvirt with
# virt-install --import --name ubuntu-xenial --ram 2048
--disk path=/var/lib/libvirt/images/ubuntu-16.04.qcow2,format=qcow2
--os-variant fedora23
--graphics none
These successfully create the Ubuntu guest and import it as well. But
- when I tried to access it using 'virsh console', it connects and shows a
blank screen. No interaction whatsoever.
- When I tried to access it via ssh, it did not accept the root password that
virt-builder had displayed before exiting.
- I tried to reset root user password with virt-customize(1), but even that
did not help.
In short, we have an Ubuntu guest that is not accessible anyhow.
I've reserved a beaker machine and have installed Ubuntu guest as above.
$ ssh root(a)ibm-x3550m4-7.gsslab.rdu2.redhat.com + r3dhatd0tc0m
Please feel free to have a look at it. Thank you.
--
- P J P
47AF CE69 3A90 54AA 9045 1053 DD13 3D32 FE5B 041F
4:30 p.m.
On Wed, Oct 19, 2016 at 12:45:19AM +0530, P J P wrote:
Hello,
I created an Ubuntu 16.04 Xenial guest using virt-builder(1) with
# virt-builder ubuntu-16.04
-o /var/lib/libvirt/images/ubuntu-16.04.qcow2
--size 10G --format qcow2
--firstboot-command 'dpkg-reconfigure openssh-server'
--arch x86_64
And imported it to libvirt with
# virt-install --import --name ubuntu-xenial --ram 2048
--disk path=/var/lib/libvirt/images/ubuntu-16.04.qcow2,format=qcow2
--os-variant fedora23
--graphics none
These successfully create the Ubuntu guest and import it as well. But
- when I tried to access it using 'virsh console', it connects and shows a
blank screen. No interaction whatsoever.
Yes, this is a bug.
- When I tried to access it via ssh, it did not accept the root
password that
virt-builder had displayed before exiting.
This might or might not be a bug, see below.
- I tried to reset root user password with virt-customize(1), but
even that
did not help.
This might or might not be a bug, see below.
[...]
I was able to reproduce this myself:
$ virt-builder ubuntu-16.04 --firstboot-command "dpkg-reconfigure
openssh-server" --root-password password:123456
$ qemu-system-x86_64 -nodefconfig -display none -machine accel=kvm:tcg -m 2048 -boot c
-drive file=ubuntu-16.04.img,format=raw,if=ide -netdev
user,id=usernet,hostfwd=tcp:127.0.0.1:9000-:22 -device rtl8139,netdev=usernet -serial
stdio
Observe that it boots without any console output.
In another window, try:
$ ssh -v root@localhost -p 9000
SSH will hang during connection.
If you repeat the same tests as above, but using fedora-24, it works fine.
By looking at the Ubuntu disk image directly, I was able to see that:
- it boots
- it runs the firstboot command, successfully
- the ssh server does not see any connections
- it is unclear if the root password is being set correctly or not,
because we never actually test that
So this Ubuntu template is all-round buggy, and possibly or possibly
not there is another bug with setting passwords (only affecting
Ubuntu).
Noted, and I'll try to have a look at this soon.
Also we don't regression test any of this (for any guest), which is
another bug.
Rich.
--
Richard Jones, Virtualization Group, Red Hat http://people.redhat.com/~rjones
Read my programming and virtualization blog: http://rwmj.wordpress.com
virt-p2v converts physical machines to virtual machines. Boot with a
live CD or over the network (PXE) and turn machines into KVM guests.
http://libguestfs.org/virt-v2v
1:40 a.m.
+-- On Tue, 18 Oct 2016, Richard W.M. Jones wrote --+
| I was able to reproduce this myself:
|
| $ virt-builder ubuntu-16.04 --firstboot-command "dpkg-reconfigure
openssh-server" --root-password password:123456
|
| $ qemu-system-x86_64 -nodefconfig -display none -machine accel=kvm:tcg -m
| 2048 -boot c -drive file=ubuntu-16.04.img,format=raw,if=ide -netdev
| user,id=usernet,hostfwd=tcp:127.0.0.1:9000-:22 -device
| rtl8139,netdev=usernet -serial stdio
|
| Observe that it boots without any console output.
|
| In another window, try:
|
| $ ssh -v root@localhost -p 9000
|
| SSH will hang during connection.
|
| If you repeat the same tests as above, but using fedora-24, it works fine.
|
| By looking at the Ubuntu disk image directly, I was able to see that:
|
| - it boots
|
| - it runs the firstboot command, successfully
|
| - the ssh server does not see any connections
|
| - it is unclear if the root password is being set correctly or not,
| because we never actually test that
|
| So this Ubuntu template is all-round buggy, and possibly or possibly
| not there is another bug with setting passwords (only affecting
| Ubuntu).
I see. Thank you so much for these details.
To follow-up on it, today I created a 'debian-8' guest on the same Beaker
machine. It too had the same issue of not booting with a 'console' parameter.
But saving grace was, it at least shows the grub screen. So I was able to add
the 'console=ttyS0,9600n8' kernel parameter and after that it worked well with
the console.
Thank you so much!
--
- P J P
47AF CE69 3A90 54AA 9045 1053 DD13 3D32 FE5B 041F
2:45 a.m.
+-- On Wed, 19 Oct 2016, P J P wrote --+
| To follow-up on it, today I created a 'debian-8' guest on the same Beaker
| machine. It too had the same issue of not booting with a 'console' parameter.
| But saving grace was, it at least shows the grub screen. So I was able to add
| the 'console=ttyS0,9600n8' kernel parameter and after that it worked well with
| the console.
Finally I got into this Ubuntu VM by copying ssh public key with
--ssh-inject. God bless --ssh-inject and rwmjones for providing it. :)
Once 'console=ttyS0,9600n8' was added to the kernel parameter list, it is
working well with the virsh console.
Kernel command line also had two parameters 'splash' and Ubuntu specific
'vt_handoff'
-> https://help.ubuntu.com/community/vt.handoff,
Maybe guest could do without them.
Thank you.
--
- P J P
47AF CE69 3A90 54AA 9045 1053 DD13 3D32 FE5B 041F
8:11 a.m.
See the workarounds for Debian 8 & Ubuntu 16.04 here:
https://www.redhat.com/archives/libguestfs/2016-October/msg00099.html
I tested password changing and that's working fine.
Rich.
--
Richard Jones, Virtualization Group, Red Hat http://people.redhat.com/~rjones
Read my programming and virtualization blog: http://rwmj.wordpress.com
virt-top is 'top' for virtual machines. Tiny program with many
powerful monitoring features, net stats, disk stats, logging, etc.
http://people.redhat.com/~rjones/virt-top
2:29 a.m.
+-- On Thu, 20 Oct 2016, Richard W.M. Jones wrote --+
| See the workarounds for Debian 8 & Ubuntu 16.04 here:
| https://www.redhat.com/archives/libguestfs/2016-October/msg00099.html
Great! Thank you so much!
| I tested password changing and that's working fine.
Working fine without any changes? Strange, it didn't for me for both Debian
and Ubuntu images.
Thank you.
--
- P J P
47AF CE69 3A90 54AA 9045 1053 DD13 3D32 FE5B 041F
2:35 a.m.
On Fri, Oct 21, 2016 at 12:59:45PM +0530, P J P wrote:
+-- On Thu, 20 Oct 2016, Richard W.M. Jones wrote --+
| See the workarounds for Debian 8 & Ubuntu 16.04 here:
| https://www.redhat.com/archives/libguestfs/2016-October/msg00099.html
Great! Thank you so much!
| I tested password changing and that's working fine.
Working fine without any changes? Strange, it didn't for me for both Debian
and Ubuntu images.
I added a regression test which tests password changing:
https://github.com/libguestfs/libguestfs/commit/2f57eb181f5083c131c59da9c...
If you have a reproducible case where password changing does
not work for you, then let us know.
Rich.
--
Richard Jones, Virtualization Group, Red Hat http://people.redhat.com/~rjones
Read my programming and virtualization blog: http://rwmj.wordpress.com
libguestfs lets you edit virtual machines. Supports shell scripting,
bindings from many languages. http://libguestfs.org
3:25 a.m.
+-- On Fri, 21 Oct 2016, Richard W.M. Jones wrote --+
| I added a regression test which tests password changing:
|
https://github.com/libguestfs/libguestfs/commit/2f57eb181f5083c131c59da9c...
Okay, cool.
| If you have a reproducible case where password changing does not work for
| you, then let us know.
It was on the beaker machine, not anymore.
Thank you.
--
- P J P
47AF CE69 3A90 54AA 9045 1053 DD13 3D32 FE5B 041F
2954
days inactive
2957
days old
7 comments
2 participants
participants (2)
-
P J P -
Richard W.M. Jones