Fedora 17
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[1] デフォルトで有効になっている不要サービスは停止しておきます。以下のコマンドで現在有効になっているサービスの一覧を出力できます。 (--all を付けると無効サービスも含めてリストされる)
[root@dlp ~]#
systemctl -t service

UNIT                              LOAD   ACTIVE SUB     JOB DESCRIPTION
auditd.service                    loaded active running     Security Auditing Service
crond.service                     loaded active running     Command Scheduler
dbus.service                      loaded active running     D-Bus System Message Bus
fedora-autorelabel-mark.service   loaded active exited      Mark the need to relabel after reboot
fedora-readonly.service           loaded active exited      Configure read-only root support
fedora-storage-init-late.service  loaded active exited      Initialize storage subsystems (RAID, LVM, etc.)
fedora-storage-init.service       loaded active exited      Initialize storage subsystems (RAID, LVM, etc.)
fedora-wait-storage.service       loaded active exited      Wait for storage scan
getty@tty1.service                loaded active running     Getty on tty1
lvm2-monitor.service              loaded active exited      Monitoring of LVM2 mirrors, snapshots etc. using dmeventd or
 progress polling
network.service                   loaded active exited      LSB: Bring up/down networking
remount-rootfs.service            loaded active exited      Remount Root FS
rsyslog.service                   loaded active running     System Logging Service
sendmail.service                  loaded active running     Sendmail Mail Transport Agent
sm-client.service                 loaded active running     Sendmail Mail Transport Client
sshd.service                      loaded active running     OpenSSH server daemon
systemd-journald.service          loaded active running     Journal Service
systemd-logind.service            loaded active running     Login Service
systemd-readahead-collect.service loaded active exited      Collect Read-Ahead Data
systemd-readahead-replay.service  loaded active exited      Replay Read-Ahead Data
systemd-remount-api-vfs.service   loaded active exited      Remount API VFS
systemd-sysctl.service            loaded active exited      Apply Kernel Variables
systemd-tmpfiles-setup.service    loaded active exited      Recreate Volatile Files and Directories
systemd-user-sessions.service     loaded active exited      Permit User Sessions
systemd-vconsole-setup.service    loaded active exited      Setup Virtual Console
udev-settle.service               loaded active exited      udev Wait for Complete Device Initialization
udev-trigger.service              loaded active exited      udev Coldplug all Devices
udev.service                      loaded active running     udev Kernel Device Manager

LOAD   = Reflects whether the unit definition was properly loaded.
ACTIVE = The high-level unit activation state, i.e. generalization of SUB.
SUB    = The low-level unit activation state, values depend on unit type.
JOB    = Pending job for the unit.

28 units listed. Pass --all to see inactive units, too.
[2] 不要なサービスを止めるには以下のようにします。例として、sendmailを停止し、システムの起動時に自動的に立ち上がらないようにしています。
[root@dlp ~]#
systemctl stop sendmail.service

[root@dlp ~]#
systemctl disable sendmail.service

rm '/etc/systemd/system/multi-user.target.wants/sendmail.service'
[3] 上記サービス(Systemdサービス)以外に旧式のSysVサービスが残っており、 こちらの自動起動設定は旧式の chkconfig で制御することになります。 最小構成でインストールした場合のSysVサービスは以下の3つのみです。
[root@dlp ~]#
chkconfig --list

Note: This output shows SysV services only and does not include native
      systemd services. SysV configuration data might be overridden by native
      systemd configuration.

netconsole      0:off   1:off   2:off   3:off   4:off   5:off   6:off
network         0:off   1:off   2:on    3:on    4:on    5:on    6:off

# netconsoleの自動起動をオフにする

[root@dlp ~]#
chkconfig netconsole off