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My installation of CentOS

Please pay attention this is my personal setup for a SERVER (running only CLI etc)

Edit /etc/sysconfig/network and add (disable zeroconf, allow routing) : NOZEROCONF=yes FORWARD_IPV4=yes

Disable ipv6 : echo "alias net-pf-10 off” >> /etc/modprobe.conf

"yum erase" these: acpid apmd anacron at atd bluez-bluefw bluez-hcidump bluez-libs bluez-utils cups dhclient dhcpv6_client dmraid eject finger hal htmlview irda-utils isdn4k-utils lftp mailx mgetty minicom ncurses NetworkManager nfs-utils openldap pcmcia-cs pinfo pm -e irda-utils portmap ppp procmail proftpd python-sqlite redhat-logos redhat-lsb redhat-menus rhnlib rp-pppoe rsh setools setserial setuptool sqlite system-config-securitylevel-tui up2date wireless-tools wvdial xinetd ypbind yp-tools

Then, yum update

Configure tcp_wrapper : /etc/hosts.allow /etc/hosts.deny /etc/hosts.sshd

Properly configure SSH : port xx22 < -- run on a different port, security through obscurity private key only

Configure Grub : `Set a md5 password

Replace sendmail by postfix yum install system-switch-mail postfix $ system-switch-mail yum erase sendmail

Edit /etc/inittab : Comment mingetty tty(3|4|5|6) Comment ctrl alt del Reload inittab : init q

Configure Iptables

Suppress services / stop via chkconfig

rpm -e kernel-utils if kernel 2.6.x

Services not needed : acpi nfs kudzu apmd xinetd

Make yum aliases

This is not meant to be a guide that would fit to your configuration, it fits to mine