OpenVZ: vzctl enter gives “Unable to open pty: No such file or directory”

You can get the following error on OpenVZ hosts.

# vzctl enter 123
enter into CT 123 failed
Unable to open pty: No such file or directory

To fix this, you can re-create the pty and tty devices from the hardware node.

# vzctl exec 123 /sbin/MAKEDEV tty
# vzctl exec 123 /sbin/MAKEDEV pty

The vzctl enter should work again.