On Mon, Dec 07, 2009 at 03:02:53AM -0600, Tony Risinger wrote:
hello,
i am trying to use libvirt with LXC, and having some issues... everything seems ok when using lxc-* tools. host box is Arch Linux. ultimately i'm getting this error in the domain log:
..... 05:45:31.353: debug : lxcControllerMain:380 : EPOLLHUP from fd 7
i was getting this last night in #virt:
..... 20:49:57.545: error : lxcFdForward:230 : read of fd 7 failed: Input/output error libvir: Linux Container error : read of fd 7 failed: Input/output error
I believe this essentially says that the container has shutdown.
-----CONFIGURATION
# host ptmx symlinked to pts/ptmx [root@PHS-001 vps]# ls -l /dev/ptmx lrwxrwxrwx 1 root root 8 2009-12-08 04:40 /dev/ptmx -> pts/ptmx
# guest ptmx symlinked to pts/ptmx [root@PHS-001 vps]# ls -l /vps/dom/ubuntu/root/dev/ptmx lrwxrwxrwx 1 root root 8 2009-12-06 04:11 /vps/dom/ubuntu/root/dev/ptmx -> pts/ptmx
Avoid doing this - libvirt will set that up as part of the container bootstrapping processs.
# guest config... # i have tried the legacy <console type='pty' /> with same results # i dont fully understand this, why do i need to specify a host/source pty? [root@PHS-001 vps]# cat /vps/def/exec/sys/ubuntu.xml <domain type='lxc'> <name>ubuntu</name> <memory>500000</memory> <os> <type arch='i686'>exe</type> <init>/sbin/init</init> </os> <clock offset='utc'/> <on_poweroff>destroy</on_poweroff> <on_reboot>restart</on_reboot> <on_crash>destroy</on_crash> <devices> <filesystem type='mount'> <source dir='/vps/dom/ubuntu/root'/> <target dir='/'/> </filesystem> <console type='pty'> <source path='/dev/pts/4'/>
Leave out the <source> here - that's auto-generated when the container starts
<target port='0'/> </console> </devices> </domain>
-----PROCEDURE
[root@PHS-001 vps]# LIBVIRT_DEBUG=1 libvirtd --daemon 05:42:46.121: debug : virInitialize:278 : register drivers .....
[root@PHS-001 vps]# virsh -c lxc:/// define /vps/def/exec/sys/ubuntu.xml Domain ubuntu defined from /vps/def/exec/sys/ubuntu.xml
[root@PHS-001 vps]# virsh -c lxc:/// define /vps/def/exec/sys/ubuntu.xml Domain ubuntu defined from /vps/def/exec/sys/ubuntu.xml
[root@PHS-001 vps]# virsh -c lxc:/// start ubuntu Domain ubuntu started
[root@PHS-001 vps]# virsh -c lxc:/// console ubuntu error: Unable to get domain status error: internal error Unable to get cgroup for ubuntu
-----LOGS
# /var/log/libvirt/lxc/ubuntu.log 05:45:31.126: debug : virCgroupMakeGroup:450 : Make group /libvirt/lxc 05:45:31.126: debug : virCgroupMakeGroup:462 : Make controller /cgroup/1534/libvirt/lxc/ 05:45:31.211: debug : lxcContainerStart:832 : clone() returned, 1536 05:45:31.353: debug : lxcControllerMain:380 : EPOLLHUP from fd 7
i've tried endless variations of the <devices> section, but i just cant seem to get anything going with libvirt/LXC once i move the root to a new location for a system container. same container works fine with lxc-* tools (although i manually make a bridge). any help is appreciated,
Rather that going straight for a full OS, try just setting up a trivial busybox root environment which just takes you intoa busybox shell. eg, in /sbin/init just have #!/sbin/busybox sh (Obviously install busybox in /sbin inside the root env too :-) Daniel -- |: Red Hat, Engineering, London -o- http://people.redhat.com/berrange/ :| |: http://libvirt.org -o- http://virt-manager.org -o- http://ovirt.org :| |: http://autobuild.org -o- http://search.cpan.org/~danberr/ :| |: GnuPG: 7D3B9505 -o- F3C9 553F A1DA 4AC2 5648 23C1 B3DF F742 7D3B 9505 :|