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I have a problem with the server running on CentOS. CentOs has been upgraded to version 6.4 and has all updates. Updates were made according to the official repositories. On the server running the V-Server.

Local /fstab

-------------------------------FSTAB------------------------------------------
Device>>>>>Mountpoint>>>>>FStype>>>>>Options>>>>>Dump>>>>>Pass
/dev/sda1 /boot ext3 rw,noatime 1 2
/dev/vg0/root / ext3 rw,noatime 1 1
/dev/vg0/swap none swap sw 0 0
/dev/vg0/usr /usr ext3 rw,noatime 1 2
/dev/vg0/var /var ext3 rw,noatime 1 2
/dev/vg0/log /var/log ext3 rw,noatime 1 2
/dev/vg0/tmp /tmp ext3 rw,noatime,nosuid,noexec 1 2
/dev/vg0/home /home ext3 rw,noatime 1 2
/dev/vg0/vz /vservers ext3 rw,noatime 1 2
tmpfs /dev/shm tmpfs defaults 0 0
devpts /dev/pts devpts rw,gid=5,mode=620 0 0
sysfs /sys sysfs defaults 0 0
proc /proc proc defaults 0 0

The problem is with / dev / pts / ptmx

root@Hostname #/dev/pts > ls -la
total 0
drwxr-xr-x 2 root root 0 Sep 12 12:34 .
drwxr-xr-x 18 root root 3860 Sep 12 12:34 ..
crw--w---- 1 mmichalski tty 136, 0 Sep 12 12:53 0
c--------- 1 root root 5, 2 Sep 12 12:34 ptmx

As you can see it has no rights. The same situation is running virtual. Below is the fstab file virtual

fstab on virtual running on Vserver

none /proc proc defaults 0 0
none /tmp tmpfs size=16m,mode=1777 0 0
none /dev/pts devpts gid=5,mode=620 0 0

What can cause this problem and where to look for solutions?

Regards

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Default mode for ptmx nodes is 0000. See the man mount and search for ptmxmode. You can verify your mount options by mount.

For my machine (not CentOS)

$ mount | grep devpts
devpts on /dev/pts type devpts (rw,nosuid,noexec,relatime,gid=5,mode=620,ptmxmode=000)

Then indeed the mode is 0000.

$ ls -l /dev/pts/ptmx 
c--------- 1 root root 5, 2 Sep  6 10:13 /dev/pts/ptmx

However, /dev/ptmx is the one which is important and it gets created by udev.

$ grep -ri ptmx /usr/lib/udev/*
/usr/lib/udev/rules.d/50-udev-default.rules:SUBSYSTEM=="tty", KERNEL=="ptmx", GROUP="tty", MODE="0666"

$ ls -l /dev/ptmx
crw-rw-rw- 1 root tty 5, 2 Sep 12 13:58 /dev/ptmx
  • @spy86 What doesn't work? I believe that the permission problem as you've described in the question is not a problem at all. – Miroslav Koškár Sep 14 '13 at 0:22

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