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SAVE-ENTROPY(8) System Manager's Manual SAVE-ENTROPY(8) NAME save-entropy -- Save bits of entropy to feed /dev/random at startup SYNOPSIS save-entropy DESCRIPTION The save-entropy command is used to save entropy data from /dev/random to files in a specified output location. The files saved are used at startup to provide additional entropy for /dev/random. The output file will be different in every invocation until the maximum number of dif- ferent files is reached. (See entropy_save_num for details). By de- fault this script is invoked via cron(8) every eleven minutes approxi- mately. This command does nothing if executed inside a jail(8). Three variables in /etc/rc.conf regulate the behavior of the script: entropy_dir Specify the directory for saved entropy files. Defaults to /var/db/entropy. If set to "NO" it disables caching entropy via cron(8). This setting is shared with /etc/rc.d/random. entropy_save_sz Size of the entropy cache files. Defaults to 4096. entropy_save_num Number of entropy cache files to save. Defaults to 8. FILES /etc/rc.conf EXIT STATUS The save-entropy utility exits 0 on success, and >0 if an error occurs. Errors will be recorded in the system log. SEE ALSO syslog(3), random(4), rc.conf(5), cron(8) HISTORY The save-entropy command first appeared in FreeBSD 5.0. AUTHORS The save-entropy command was originally written by Doug Barton <dougb@FreeBSD.org>. This manual page was written by Fernando Apesteguia <fernape@FreeBSD.org>. FreeBSD 15.0 September 18, 2023 SAVE-ENTROPY(8)
NAME | SYNOPSIS | DESCRIPTION | FILES | EXIT STATUS | SEE ALSO | HISTORY | AUTHORS
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