rpm extraction

rpm2cpio myrpmfile.rpm | cpio -idmv

RHEL/CentOS softraid

1: create softraid volume
2: raid assignment
grub> device (hd0) /dev/sda

grub> device (hd1) /dev/sdb
grub> root (hd0,0)
grub> setup (hd0)
grub> root (hd1,0)
grub> setup (hd1)
grub> quit

perl module install

perl -MCPAN -e shell
install xxx::xxxx
Math::BigInt::GMP
Net::SSH::Perl
Crypt::DH::GMP
gmp-devel