Ok, I'm having some problem with PAM because that thing is filling up my log with useless msg every time CRON start jobs. The problem is that I have some cron jobs executed every 5 or 10 min.

So my logs look like :
Aug 4 20:55:01 router PAM_unix[19674]: (cron) session opened for user root by (uid=0)
Aug 4 20:55:01 router /USR/SBIN/CRON[19675]: (root) CMD (/etc/init.d/ipupdate >> /dev/null)
Aug 4 20:55:04 router PAM_unix[19674]: (cron) session closed for user root
Aug 4 21:00:01 router PAM_unix[19728]: (cron) session opened for user root by (uid=0)
Aug 4 21:00:01 router /USR/SBIN/CRON[19729]: (root) CMD (/etc/init.d/ipupdate >> /dev/null)
Aug 4 21:00:02 router PAM_unix[19728]: (cron) session closed for user root
Aug 4 21:05:01 router PAM_unix[19788]: (cron) session opened for user root by (uid=0)
Aug 4 21:05:01 router /USR/SBIN/CRON[19789]: (root) CMD (/etc/init.d/ipupdate >> /dev/null)
Aug 4 21:05:02 router PAM_unix[19788]: (cron) session closed for user root
Aug 4 21:10:01 router PAM_unix[19822]: (cron) session opened for user root by (uid=0)
Aug 4 21:10:01 router /USR/SBIN/CRON[19823]: (root) CMD (/etc/init.d/ipupdate >> /dev/null)
Aug 4 21:10:02 router PAM_unix[19822]: (cron) session closed for user root



Well, pretty annoying! Is there a way to shut up PAM or just force it to run in quiet mode?

" Is there a way to shut up PAM or just force it to run in quiet mode?"

If there is a way it is probably a configuration parameter in /etc/pam.conf or perhaps /etc/pam.d/other

I already read all the PAM docu on tldp and there's only options to INCREASE logging, not too decrease it.

You might try changing /etc/syslog.conf to not log the PAM messages.

For example if PAM classifies the messages as info then you could have a line in /etc/syslog.conf that says:
*.info /dev/null
This will eliminate all info messages from any program.

Similarly if PAM classifies the messages as notice then you could have a line in /etc/sylogd.conf that says:
*.notice /dev/null

well it's not a good solution since I need some info or notice msg that are not coming from PAM. But thanks you anyways I think it will end like this soon, I'm pretty tired of all these useless msg.

There's no ways to gently ask PAM to stop logging sucessful action, as example?

You might try changing /etc/syslog.conf to not log the PAM messages.
Bad, damn bad suggestion. PAM and other access methods' logging is there for a reason. Half_Elf, if you got problems *reading* your (logrotated) logs, try to pull them tru a logparser like Logsurfer or Logwatch to shake off the crud else pipe them tru a filter, maybe something like this: http://www.linuxquestions.org/questi...984#post410984

unSpawn: well, habitually, I use tail -f to keep an eye on my log. I suppose I'll have to learn perl to code something to show me everything BUT these annoying PAM msg