On 06/11/2013 02:02 PM, Richard Weinberger wrote:
Am 11.06.2013 05:12, schrieb Gao feng:
On 06/11/2013 04:51 AM, Richard Weinberger wrote:
Am 10.06.2013 21:53, schrieb Richard Weinberger:
Am 10.06.2013 21:17, schrieb Richard Weinberger:
Hi!
Am 04.06.2013 13:03, schrieb Daniel P. Berrange:
> It's still under review. needs some ACK. > If you can help to test or ACK this patchset, it will be very helpful. :) > > Actually, I just want to ping...
I've been away on holiday for 2 weeks, so not had a chance to review it yet. I'll get to it this week. I hope we'll get this in the 1.0.6 release this month.
Finally I've found some time to test version 4 of the userns patch set. But I'm unable to create a container.
---cut--- linux:~ # LANG=C /opt/libvirt/bin/virsh -c lxc:/// create c1.conf error: Failed to create domain from c1.conf error: Interner Fehler guest failed to start: PATH=/bin:/sbin TERM=linux container=lxc-libvirt container_uuid=3f86c48b-b027-4838-ba17-6202a1d7398b LIBVIRT_LXC_UUID=3f86c48b-b027-4838-ba17-6202a1d7398b LIBVIRT_LXC_NAME=c1 /bin/bash error receiving signal from container: Input/output error ---cut---
lxcContainerWaitForContinue() in src/lxc/lxc_controller.c fails with EIO. Maybe because the clone()'ed child dies and the file descriptor used for synchronization becomes invalid.
Here my container config: ---cut--- <domain type='lxc'> <name>c1</name> <memory>102400</memory> <os> <type>exe</type> <init>/bin/bash</init> </os> <idmap> <uid start='0' target='100000' count='100000'/> <gid start='0' target='100000' count='100000'/> </idmap> <devices> <console type='pty'/> <filesystem type='mount'> <source dir='/root/c1/rootfs'/> <target dir='/'/> </filesystem> </devices> </domain> ---cut---
Any ideas how to debug this further? This is Linux 3.9.0 with all namespaces enabled.
Whoops, forgot to add the libvirtd debug output:
---cut--- 2013-06-10 19:41:24.661+0000: 29211: debug : virCommandRunAsync:2241 : About to run PATH=/usr/lib64/mpi/gcc/openmpi/bin:/sbin:/usr/sbin:/usr/local/sbin:/root/bin:/usr/local/bin:/usr/bin:/bin:/usr/X11R6/bin:/usr/games LIBVIRT_DEBUG=1 LIBVIRT_LOG_OUTPUTS=1:stderr /opt/libvirt/lib/libvirt_lxc --name c1 --console 20 --security=none --handshake 23 --background 2013-06-10 19:41:24.663+0000: 29211: debug : virFileClose:90 : Closed fd 24 2013-06-10 19:41:24.663+0000: 29211: debug : virCommandRunAsync:2246 : Command result 0, with PID 29303 2013-06-10 19:41:24.664+0000: 29303: debug : virFileClose:90 : Closed fd 3 2013-06-10 19:41:24.665+0000: 29303: debug : virFileClose:90 : Closed fd 4 2013-06-10 19:41:24.666+0000: 29303: debug : virFileClose:90 : Closed fd 5 2013-06-10 19:41:24.666+0000: 29303: debug : virFileClose:90 : Closed fd 6 2013-06-10 19:41:24.667+0000: 29303: debug : virFileClose:90 : Closed fd 7 2013-06-10 19:41:24.667+0000: 29303: debug : virFileClose:90 : Closed fd 8 2013-06-10 19:41:24.668+0000: 29303: debug : virFileClose:90 : Closed fd 9 2013-06-10 19:41:24.668+0000: 29303: debug : virFileClose:90 : Closed fd 10 2013-06-10 19:41:24.668+0000: 29303: debug : virFileClose:90 : Closed fd 11 2013-06-10 19:41:24.668+0000: 29303: debug : virFileClose:90 : Closed fd 12 2013-06-10 19:41:24.668+0000: 29303: debug : virFileClose:90 : Closed fd 13 2013-06-10 19:41:24.669+0000: 29303: debug : virFileClose:90 : Closed fd 14 2013-06-10 19:41:24.669+0000: 29303: debug : virFileClose:90 : Closed fd 15 2013-06-10 19:41:24.670+0000: 29303: debug : virFileClose:90 : Closed fd 16 2013-06-10 19:41:24.670+0000: 29303: debug : virFileClose:90 : Closed fd 17 2013-06-10 19:41:24.670+0000: 29303: debug : virFileClose:90 : Closed fd 18 2013-06-10 19:41:24.671+0000: 29303: debug : virFileClose:90 : Closed fd 19 2013-06-10 19:41:24.671+0000: 29303: debug : virFileClose:90 : Closed fd 22 2013-06-10 19:41:24.790+0000: 29211: debug : virCommandRun:2115 : Result status 0, stdout: '(null)' stderr: '(null)' ---cut---
Looks like libvirt_lxc was executed and died silently.
Found the problem. /opt/libvirt/var/log/libvirt/lxc/c1.log contained the info I needed. Search permissions for /root were missing. m( Would be nice if virsh would be able to tell one this...
:) have fun with user namespace & libvirt. And thanks for your test.
Yeah. So far it looks very good. I was able to convert my containers from my custom lxc/userns setup to libvirt+userns.
One more question, is it by design that virsh lxc-enter-namespace does not setup uid/gid mappings?
lxc-enter-namespace doesn't have the need to setup uid/gid mappings, Since lxc-enter-namespace is running on the host side, the uid/gid mappings already exist, But we should call setid for the child task of lxc-enter-namespace, this child task running in the container. I will improve lxc-enter-namespace after this patchset being accepted. Thanks, Gao
Thanks, //richard