Linux – What does the ‘seclabel’ mount option do

linuxmount

I use Nagios and check_mk to monitor some servers. I get several warnings about the mount options of a couple of servers. The message is: 'OK – missing: seclabel'.

I can't find documentation about seclabel. The only thing I can find about it is that it probably has to do with selinux. Maybe I could just add the seclabel to the mount options but I'd like to know what it does and why it's there first.

So my question is, what is the seclabel mount option for?

Best Answer

seclabel is an indicator added by the selinux code, that the filesystem is using xattrs for labels and that it supports label changes by setting the xattrs.

You shouldn't add seclabel on your own, it should normally be added by selinux automatically if it's enabled.

I would try to find a way to ignore that nagios message if you don't need selinux.

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Linux Mount – How to Mount a Device in Linux

You can use fdisk to have an idea of what kind of partitions you have, for example:

fdisk -l

Shows:

   Device Boot      Start         End      Blocks   Id  System
/dev/sda1   *          63   204796619   102398278+   7  HPFS/NTFS
/dev/sda2       204797952   205821951      512000   83  Linux
/dev/sda3       205821952   976773119   385475584   8e  Linux LVM

That way you know that you have sda1,2 and 3 partitions. The -t option is the filesystem type; it can be NTFS, FAT, EXT. In my example, sda1 is ntfs, so it should be something like:

mount -t ntfs /dev/sda1  /mnt/

USB devices are usually vfat and Linux are usually ext.

Linux – ‘user’ Option Works for Mount but Not for Umount

The problem is that your /etc/mtab is not a file but a symlink to /proc/mounts. This has advantages but also the disadvantage that user does not work. You already guessed right the reason for that: "the system is confused when remembering who mounted the file system". This information is written to mtab, cannot be written there in your case though. The kernel doesn't care (doesn't even know) about user mounts (this is a userspace feature). Thus this info is not contained in /proc/mounts.

Do this:

cd /etc
cp mtab mtab.file
rm mtab
mv mtab.file mtab

umount as user should work after you have mounted the volume again.

Best Answer

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Linux Mount – How to Mount a Device in Linux

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