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FSIRAND (8) | System administration commands and daemons | Unix Manual Pages | :man

NAME

fsirand - randomize inode generation numbers

CONTENTS

Synopsis
Description
Options
Caveats
See Also
History
Authors

SYNOPSIS

fsirand [-b] [-f] [-p] special ["special ..."]

DESCRIPTION

The fsirand utility installs random generation numbers on all the inodes for each file system specified on the command line by special. This increases the security of NFS-exported file systems by making it difficult to ‘‘guess’’ filehandles.

Note: newfs(8) now does the equivalent of fsirand itself so it is no longer necessary to run fsirand by hand on a new file system. It is only used to re-randomize or report on an existing file system.

The fsirand utility should only be used on an unmounted file system that has been checked with fsck(8) or a file system that is mounted read-only. The fsirand utility may be used on the root file system in single-user mode but the system should be rebooted via ‘‘reboot -n’’ afterwards.

OPTIONS

The available options are as follows:
-b Use the default block size (usually 512 bytes) instead of the value gleaned from the disklabel.
-f Force fsirand to run even if the file system on special is not marked as clean.
-p Print the current generation numbers for all inodes instead of generating new ones.

CAVEATS

Since fsirand allocates enough memory to hold all the inodes in a given cylinder group it may use a large amount of memory for large disks with few cylinder groups.

SEE ALSO

fs(5), fsck(8), newfs(8)

HISTORY

AUTHORS


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