Container enter failed
Contents
Problem
When you issue the following command you get an error:
[root@server ~]# vzctl enter 101 enter into CT 101 failed Unable to open pty: No such file or directory
Solutions
Using strace
You can use strace to analyse the command further:
# strace -ff vzctl enter 101 .... fstat64(...st_mode=S_IFCHR|0620, st_rdev=makedev(136, 0)...) fail ....
Recompile the kernel with the following option:
CONFIG_LEGACY_PTYS=y
LEGACY_PTYS
Temporary fix
Note: This is a temporary fix so you can enter the VE.
- Create the LEGACY_PTYS devices:
vzctl exec 101 /sbin/MAKEDEV tty vzctl exec 101 /sbin/MAKEDEV pty vzctl enter 101
Permanent fix with udev
- For a permanent fix with udev, you will need to force udev to make LEGACY_PTYS:
cat > /etc/udev/makedev.d/51-udev.nodes # These device have to be created manually tty0 tty1 tty2 tty3 .... ttyp0 ttyp1 ttyp2 ttyp3 .... ptyp0 ptyp1 ptyp2 ptyp3 ....
Permanent fix without udev
- Alternatively, you can disable udev:
Edit the /etc/rc.d/rc.sysinit file and comment out the /sbin/start_udev line
Or you can run the following command:
sed -i 's|/sbin/start_udev|#/sbin/start_udev|g' /etc/rc.d/rc.sysinit
Warning Updates to the package which owns this file may revert your changes.
Note This was tested with CentOS VE.
Debian only
- Enter the VE manually
CTID=101 vzctl exec $CTID "mount -t devpts devpts /dev/pts" vzctl enter $CTID
- Remove udev using apt
CTID=101 vzctl exec $CTID apt-get remove udev vzctl restart $CTID
