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Full Discussion: Linux Containers - /proc mounting and other queries
Top Forums UNIX for Beginners Questions & Answers Linux Containers - /proc mounting and other queries Post 303026780 by MadeInGermany on Monday 3rd of December 2018 09:25:50 AM
Old 12-03-2018
Quote:
Originally Posted by sreyan32
Is there any documentation that tells how /proc behaves when given a namespace? Also can a system have /proc mounted on 2 different places? How is that even allowed?
Try yourself:
Code:
mount -t proc proc /mnt
mount | grep proc
proc on /proc type proc (rw,nosuid,nodev,noexec,relatime)
proc on /mnt type proc (rw,relatime)
ls /mnt
ls /proc

After your tests do not forget to umount the 2nd mount point
Code:
umount /mnt

Quote:
Originally Posted by sreyan32
ICould you please explain what you mean by "forwarding" of a an existing mount point? Also what is the difference between a normal mount and a bind mount? No one has clear answer for that.
Hard to explain. An example is a disk mount (filesystem like ext3,ext4,reiserfs,xfs,...), that is only allowed once, because writes to the two mount points would cause a corruption in the filesystem on the disk. But: a bind mount of the primary disk mount to another mount point is allowed; all writes occur at the primary mount point.

Quote:
Originally Posted by sreyan32
IWhat do you mean by "mapping out" ? Does that mean that whenever I query /proc the kernel actually "puts" information there for the program that is querying the info?
Yes, at least the contents of the files is created by a little kernel routine when accessed. Some files are even reverse-handled: by writing a value into it, the kernel routine patches the corresponding location in kernel memory.
 

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LEARN ABOUT LINUX

remote-filesystems

remote-filesystems(7)					 Miscellaneous Information Manual				     remote-filesystems(7)

NAME

       remote-filesystems - event signalling that remote filesystems have been mounted

SYNOPSIS

       local-filesystems [ENV]...

DESCRIPTION

       The  remote-filesystems event is generated by the mountall(8) daemon after it has mounted all remote filesystems listed in fstab(5).  moun-
       tall(8) emits this event as an informational signal, services and tasks started or stopped by this event will do so in parallel with  other
       activity.

       This event is typically used by services that must be started to manage remote filesystems.  When it occurs, local filesystems such as /usr
       may not be mounted.  For most normal services the filesystem(7) event is sufficient.

       This event will never occur before the virtual-filesystems(7) event.

EXAMPLE

       A service that wishes to be running once remote filesystems are mounted might use:

	      start on remote-filesystems

SEE ALSO

       mounting(7) mounted(7) virtual-filesystems(7) local-filesystems(7) all-swaps(7) filesystem(7)

mountall							    2009-12-21						     remote-filesystems(7)
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