unable to enter into VPS

You may get an error while entering to a openvz vps. You cant also ssh to the vps from outside.

Error:
vzctl enter xxxx
enter into VE xxxx failed
Unable to open pty: No such file or directory

1. If it is a redhat based system such as CentOS,

The solution is :
vzctl exec VEID /sbin/MAKEDEV pty
vzctl exec VEID /sbin/MAKEDEV tty
vzctl enter VEID

To fix this issue permanently

Edit the file /etc/rc.sysinit of the VPS
Comment the line :
/sbin/start_udev   to
#/sbin/start_udev

Add the following lines after /sbin/start_udev:
/sbin/MAKEDEV tty
/sbin/MAKEDEV pty

2. If it is a Debian system
vzctl exec veid update-rc.d -f udev remove
vzctl restart veid

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