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.
Small info how to unpack from .pkg file on linux. As it seems little hard to find out 😉
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 – all fixed, and kickstart is installing 222 packages and not 378 
Memory used: 47 MB !!
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 –al 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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