运行命令 vzctl enter VEID，显示错误如下:
enter into VE VEID failed
Unable to open pty: No such file or directory

RedHat, CentOS, Fedora中解决方法如下：
# vzctl exec VEID /sbin/MAKEDEV pty
# vzctl exec VEID /sbin/MAKEDEV tty
#vzctl enter VEID