カーネルやパッケージを最新に保つ.
# emacs /etc/bashrc
export http_proxy="http://proxy.com:port"
yum list update yum update shutdown -r now
emacs /etc/rc.d/init.d/yum
# chkconfig: 345 50 01
chkconfig yum on
rpm --import /usr/share/rhn/RPM-GPG-KEY-fedora