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SSH returns: "Server refused to allocate pty" upon login.
OR:
"enter into VE 101 failed
Unable to open pty: No such file or directory"


This solution is for CentOS VE's.

Solution #1
At the HN (hardware node) enter (replace 101 with your VE-id / CT-id):

$ vzctl exec 101 /sbin/MAKEDEV tty
$ vzctl exec 101 /sbin/MAKEDEV pty

Then enter the VE/CT:

$ vzctl enter 101

And make sure the udev rpm is gone:
$ rpm -e --nodeps udev
...else the problem comes back after a VE reboot.

Solution #2

If the problem persists try this:

$ vzctl exec 101 rpm -e --nodeps udev
$ nano -w /var/lib/vz/root/101/etc/rc.sysinit
or...
$ nano -w /vz/root/101/etc/rc.sysinit

Find:
/sbin/start_udev
Replace by:
#/sbin/start_udev
/sbin/MAKEDEV tty
/sbin/MAKEDEV pty
$ vzctl restart 101

Solution #3

If the problem persists after reboot, repeat the steps above and create the following file within the VE/CT:

/etc/udev/makedev.d/51-udev.nodes

...with these contents:

# These device have to be created manually
tty0
tty1
tty2
tty3
ttyp0
ttyp1
ttyp2
ttyp3
ptyp0
ptyp1
ptyp2
ptyp3


Solution #4

Sometimes the problem can be very persistent. If none helps, the following solution might help. It copies devices from the hostnode to the container.

Create and edit /etc/vz/conf/101.mount likewise:

#!/bin/bash
VEID=`basename $0 | sed -e 's/\(.*\)\..*/\1/g'`
rm -f /var/lib/vz/private/${VEID}/dev/*
rsync -a /dev/* /var/lib/vz/private/${VEID}/dev

$ chmod 700 /etc/vz/conf/101.mount
$ vzctl restart 101

References:
http://forum.openvz.org/index.php?t=msg&goto=14953
http://wiki.openvz.org/Container_enter_failed
http://linuxhostingsupport.net/blog/tag/sbinmakedev-pty