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Operating Systems Solaris Neat trick: Changing the permissions of an underlying mount point Post 302358264 by Smiling Dragon on Thursday 1st of October 2009 10:13:50 PM
Old 10-01-2009
Java Neat trick: Changing the permissions of an underlying mount point

A colleague of mine showed me a neat little trick in Solaris (I would guess sol 10 but perhaps earlier versions too) that I'd not seen before and thought I'd share here in case it's new for someone else also.

As most of you know, Solaris has the annoying habit of producing error messages when non-root users try to perform operations on filesystems mounted on a directory with less than 0555 permissions.
The only fix for this that I knew of (after hassling the engineer that got it wrong in the first place) was to stop everything that was using the filesystem, unmount it, change the perms, then remount again - yuck.

But this alternate way my colleague showed me appears to work without having to touch the filesystem mounted on our broken directory at all (obviously you should test this someplace safe before trying it in the wild though!):

Create some new mount point someplace:
Code:
mkdir /somedir

Loopback mount the underlying filesystem:
Code:
mount -F lofs -o nosub / /somedir

Fix the permissions on your mountpoint:
Code:
chmod 0555 /somedir/your/mount/point

Unmount:
Code:
umount /somedir

And you're done!
 

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install-solaris(1M)													       install-solaris(1M)

NAME
install-solaris - install the Solaris operating system SYNOPSIS
install-solaris install-solaris invokes the Solaris Install program. Depending on graphical capability and available memory at the time of invocation, install-solaris invokes either a text-based installer or a graphical installer. The following minimum requirements for physical memory dictate which features are available during installation: For SPARC machines: 128 MB Minimum physical memory for all installation types 128 MB Minimum physical memory required for windowing system 384 MB Minimum physical memory required for graphical-based installation For x86 machines: 256 MB Minimum physical memory for all installation types 256 MB Minimum physical memory required for windowing system 512 MB Minimum physical memory required for graphical-based installation In some cases, even if the minimum physical memory is present, available virtual memory after system startup can limit the number of fea- tures available. install-solaris exists only on the Solaris installation media (CD or DVD) and should be invoked only from there. Refer to the for more details. install-solaris allows installation of the operating system onto any standalone system. install-solaris loads the software available on the installation media. Refer to the for disk space requirements. Refer to the for more information on the various menus and selections. See attributes(5) for descriptions of the following attributes: +-----------------------------+-----------------------------+ | ATTRIBUTE TYPE | ATTRIBUTE VALUE | +-----------------------------+-----------------------------+ |Availability |SUNWcdrom (Solaris instal- | | |lation media) | +-----------------------------+-----------------------------+ |Interface Stability |Evolving | +-----------------------------+-----------------------------+ pkginfo(1), install(1M), pkgadd(1M), attributes(5) It is advisable to exit install-solaris by means of the exit options in the install-solaris menus. 23 Sep 2005 install-solaris(1M)
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