Difference between revisions of "Container enter failed"
Sandro magri (talk | contribs) (alternative solution for the problem) |
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| − | + | == Symptoms == | |
| − | + | ||
<pre> | <pre> | ||
| − | + | error: open pty: No such file or directory | |
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</pre> | </pre> | ||
| − | Using strace | + | == Solutions == |
| + | |||
| + | === Using strace === | ||
| + | |||
| + | You can use [http://linux.die.net/man/1/strace strace] to analyse the command further: | ||
<pre> | <pre> | ||
| − | # strace -ff vzctl enter | + | # strace -ff vzctl enter 101 |
.... | .... | ||
fstat64(...st_mode=S_IFCHR|0620, st_rdev=makedev(136, 0)...) fail | fstat64(...st_mode=S_IFCHR|0620, st_rdev=makedev(136, 0)...) fail | ||
| Line 17: | Line 17: | ||
</pre> | </pre> | ||
| − | |||
Recompile the kernel with the following option: | Recompile the kernel with the following option: | ||
| − | + | CONFIG_LEGACY_PTYS=y | |
| − | 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 exec 101 mknod --mode=666 /dev/ptmx c 5 2 | ||
| + | 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 | ||
| − | + | === Older Slackware === | |
| − | + | Check that /dev/pts is mounted under the container as a devpts filesystem: | |
| − | + | vzctl exec VEID mount | |
| − | vzctl exec | ||
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| − | + | If it is not, try this immediate fix: | |
| − | + | vzctl exec VEID mount /dev/pts | |
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| − | + | You should now be able to enter the VPS. You will need to fix /etc/rc.d/rc.S and/or /etc/fstab to ensure that /dev/pts is mounted in the boot process. | |
Latest revision as of 19:30, 30 September 2014
Contents
Symptoms[edit]
error: open pty: No such file or directory
Solutions[edit]
Using strace[edit]
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[edit]
Temporary fix[edit]
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 exec 101 mknod --mode=666 /dev/ptmx c 5 2 vzctl enter 101
Permanent fix with udev[edit]
- 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[edit]
- 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[edit]
- 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
Older Slackware[edit]
Check that /dev/pts is mounted under the container as a devpts filesystem:
vzctl exec VEID mount
If it is not, try this immediate fix:
vzctl exec VEID mount /dev/pts
You should now be able to enter the VPS. You will need to fix /etc/rc.d/rc.S and/or /etc/fstab to ensure that /dev/pts is mounted in the boot process.
