[libvirt] No /dev/tty device within LXC guest?

Hi all, When I create a LXC guest(RHEL5.4) via libvirt, the guest could boot successfully. I could ping to guest, but can not ssh into the it. The secure log in the guest shows that this is due to lack of '/dev/tty' device: # tail /path/to/rootfs/of/container/var/log/secure Jul 27 04:25:25 xen2143v sshd[671]: Accepted password for zhangyufang from 10.0.0.1 port 34102 ssh2 Jul 27 04:25:25 xen2143v sshd[671]: pam_unix(sshd:session): session opened for user zhangyufang by (uid=0) Jul 27 04:25:25 xen2143v sshd[671]: pam_loginuid(sshd:session): set_loginuid failed *Jul 27 04:25:25 xen2143v sshd[671]: error: PAM: pam_open_session(): Cannot make/remove an entry for the specified session* *Jul 27 04:25:25 xen2143v sshd[674]: error: open /dev/tty failed - could not set controlling tty: No such file or directory* *Jul 27 04:25:25 xen2143v sshd[673]: Received disconnect from 10.0.0.1: 11: disconnected by user* The xml of the guest: # virsh --connect lxc:/// dumpxml instance-00000034 <domain type='lxc' id='30090'> <name>instance-00000034</name> <uuid>8387e0f1-6df3-41c8-82ba-cde7d2b60844</uuid> <memory>524288</memory> <currentMemory>524288</currentMemory> <vcpu>1</vcpu> <os> <type arch='x86_64'>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> <emulator>/usr/libexec/libvirt_lxc</emulator> <filesystem type='mount' accessmode='passthrough'> <source dir='/var/lib/nova/instances/instance-00000034/rootfs'/> <target dir='/'/> </filesystem> <interface type='bridge'> <mac address='fa:16:3e:3c:1d:95'/> <source bridge='demonetbr0'/> <target dev='veth0'/> <filterref filter='nova-instance-instance-00000034-fa163e3c1d95'> <parameter name='DHCPSERVER' value='10.0.0.1'/> <parameter name='IP' value='10.0.0.3'/> </filterref> </interface> <console type='pty' tty='/dev/pts/0'> <source path='/dev/pts/0'/> <target type='serial' port='0'/> </console> </devices> </domain> Could anyone point me to where the problem is? Thanks. Best Regards. Yufang