linux network tool

iperf -- if performance tool
iftop -- if usage
nethogs -- network usage by process

rpm relocate

rpm -qpl package.rpm
rpm --relocate "/usr/local/"="/usr/src/test/" package.rpm

rpm src

rpmbuild -bb /usr/src/redhat/SPEC/xxx.spec
rpmbuild -bp /usr/src/redhat/SPEC/xxx.spec

kickstart package

5.x system-config-kickstart --generate /my.ks
6.x yum reop need to be created for package selection
rpm -qa --qf "%{NAME}\n" > list
sed -n '1,32p' ks
append the package list to kickstart file

nis netgroup template

trusted_hosts (mytxlin13,,), (mytxlin14,,)
/etc/ssh/shosts.equiv
--> +@trusted_hosts

Linux initial RAM disk

http://www.ibm.com/developerworks/linux/library/l-initrd/index.html

apache rewrite_module

RewriteEngine On
RewriteCond %{REMOTE_ADDR} !^IP\.IP\.IP\.[1-9][0-9]{0,2}$
RewriteRule !\/Pattern http://Dest_Server/DestFolder/