DNS cache is very valuable thing when you are running RBL checks via Spamassassin. As many RBL lists, many IPs in header means a lot of queries. Of course, if you receiving 20 mails per day, its not big deal, but when you hit 200k per day, just simple thing can help a lot. With easy scrip tyou can debug how fast is Spamassassin on your system with RBL queries.
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Small info how to unpack from .pkg file on linux. As it seems little hard to find out π
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November 15th, 2010
admin
As new RHEL 6 arrived, trying to do installation as minimal. Once done via anaconda standard click-next , I realized that no option for minimal installation left in cf file.
After small searching , regarding this bug RHEL6 docs: Add information on minimal platform installation via kickstart β all fixed, and kickstart is installing 222 packages and not 378 
Memory used: 47 MB !!
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Current courier-authlib 0.63 dropped authvchkpw module ;( , however building lower version against vpopmail 5.5 seems not working Read more…
Create a named pipe using mkfifo: mkfifo -p /var/adm/syslog.pipe
Make syslog.conf to points to this file (for example /var/adm/syslog.pipe)
*.info |/var/adm/syslog.pipe
Relaunch syslogd:
kill -HUP `cat /var/run/syslogd.pid`
Create processing script that read the pipe. It should run constantly and be launched from RC scripts
#!/bin/ksh
cat /var/adm/syslog.pipe | grep -v “denied update from” | while read LINE
do
echo $LINE >>/var/adm/denied_update.log
Working with mysql on server, I need often to make quick backup od given db. Here is quick and dirty how to do it. Read more…
Sometimes it happen that on file system I have file or directory which I cannot delete, even if Im root. Cannot do chown or chmod , ls βal showing all OK, but still cannot delete it. Whatever I try , simple “permission denied” and similar message. Im the root !!! so, what to do ?
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