CentOS 5
Sponsored Link

[1] If some services are unnecessary for your server usage, it had better to disable them. Make sure current services setting like follows.
[root@dlp ~]#
chkconfig --list | less

[2] For example, stop netfs and disable auto-start on system boot.
[root@dlp ~]#
/etc/rc.d/init.d/netfs stop

[root@dlp ~]#
chkconfig netfs off

[3] Following list is all services on the default settings if you would installed with the same way to this site.
NetworkManager The NetworkManager daemon attempts to keep an active network connection available at all times.
acpid Advanced Configuration and Power Interface event daemon.
anacron Anacron can be used to execute commands periodically, with a frequency specified in days.
apmd Advanced Power Management (APM) BIOS utilities for laptops.
atd atd runs jobs queued by at.
auditd The audit package contains the user space utilities for storing and searching the audit records generate by the audit subsystem in the Linux 2.6 kernel.
autofs autofs controls the operation of the automount(8) daemons running on the Linux system.
avahi-daemon Avahi mDNS/DNS-SD daemon Avahi is a fully LGPL framework for Multicast DNS Service Discovery.
avahi-dnsconfd avahi-dnsconfd is a small daemon which may be used to configure conventional DNS servers using mDNS in a DHCP-like fashion.
bluetooth It provids wireless connections among computers.
conman ConMan is a serial console management program designed to support a large number of console devices and simultaneous users.
cpuspeed This program monitors the systemfs idle percentage and reduces or raises the CPUsf clock speeds and voltages accordingly to minimize power consumption when idle and maximize perfor-mance when needed.
crond The daemon to execute scheduled commands.
cups It's the printing system.
dund It's BlueZ Bluetooth dial-up networking daemon.
firstboot It's a tool that we can configure basic settings ofthe system by it.
gpm It's a cut and paste utility and mouse server for virtual consoles.
haldaemon It searches infomations for hardwares.
hidd It's Bluetooth HID daemon.
ip6tables It's IPv6 packet filter administration.
iptables It's administration tool for IPv4 packet filtering and NAT.
irda IrDA is a complete implementation of the various IrDA protocols and IrDA drivers for Linux.
irqbalance It distributes hardware interrupts across processors on a multiprocessor system.
kudzu It detects and configures new and/or changed hardware on a system.
lvm2-monitor Monitor LVM2 with using dmeventd.
mcstrans It's the daemon for SELinux.
mdmonitor It watches software-based RAID.
mdmpd It watches software-based RAID.
messagebus It sends messages between apprications.
microcode_ctl It's microcode utility for Intel IA32 processors.
multipathd Manage kernel's function called DeviceMapper.
netfs It's NFS client.
netplugd It's the daemon for network cable hotplug management.
network It's the daemon for network system.
nfs It's NFS server.
nfslock It provids file lock function for NFS server.
nscd Nscd is a daemon that provides a cache for the most common name service requests.
oddjobd The oddjobd daemon provides the com.redhat.oddjob service on the system-wide message bus.
pand The pand PAN daemon allows your computer to connect to ethernet networks using Bluetooth.
pcscd It's PC/SC Smart Card Daemon.
portmap Portmap is a server that converts RPC program numbers into DARPA protocol port numbers.
psacct PSACCT is a standard process running on each node that generates daily usage logs containing information on the jobs that ran and how many resources they consumed.
rawdevices The rawdevices is allocated in the block device.
rdisc Detect routers in local subnet.
readahead_early It reads files in page cache early.
readahead_later It reads files in page cache early when system is running in GUI mode.
restorecond It's the daemon that watches for file creation and then sets the default SELinux file context.
rpcgssd It's the daemon which is used for network filesystem like NIS or NFS.
rpcidmapd It's the daemon which is used for network filesystem like NIS or NFS.
rpcsvcgssd It's the daemon which is used for network filesystem like NIS or NFS.
saslauthd saslauthd is a daemon process that handles plaintext authentication requests on behalf of the SASL library.
sendmail It's SMTP server.
smartd It's SMART Disk Monitoring Daemon.
sshd It's OpenSSH SSH daemon.
syslog It reads and/or clears kernel message ring buffer; set console_loglevel.
tcsd TrouSerS server daemon
wpa_supplicant Provide IEEE 802.1x authentication.
xfs It's X fonts server.
ypbind ypbind finds the server for NIS domains and maintains the NIS binding information.
yum-updatesd yum-updatesd provides notification of updates which are available to be applied to your system.