Fedora 20
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[1] Stop services that are enabled by default if you don't need them. List all systemd services by a command below.
[root@dlp ~]#
systemctl -t service

UNIT                         LOAD   ACTIVE SUB     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-readonly.service      loaded active exited  Configure read-only root supp
getty@tty1.service           loaded active running Getty on tty1
kmod-static-nodes.service    loaded active exited  Create list of required stati
lvm2-lvmetad.service         loaded active running LVM2 metadata daemon
lvm2-monitor.service         loaded active exited  Monitoring of LVM2 mirrors, s
lvm2-pvscan@252:2.service    loaded active exited  LVM2 PV scan on device 252:2
network.service              loaded active exited  LSB: Bring up/down networking
serial-getty@ttyS0.service   loaded active running Serial Getty on ttyS0
sshd.service                 loaded active running OpenSSH server daemon
systemd-fsck-root.service    loaded active exited  File System Check on Root Dev
systemd-f...699622b3.service loaded active exited  File System Check on /dev/dis
systemd-journald.service     loaded active running Journal Service
systemd-logind.service       loaded active running Login Service
systemd-random-seed.service  loaded active exited  Load/Save Random Seed
systemd-remount-fs.service   loaded active exited  Remount Root and Kernel File
systemd-sysctl.service       loaded active exited  Apply Kernel Variables
systemd-t...etup-dev.service loaded active exited  Create static device nodes in
systemd-t...es-setup.service loaded active exited  Recreate Volatile Files and D
systemd-udev-trigger.service loaded active exited  udev Coldplug all Devices
systemd-udevd.service        loaded active running udev Kernel Device Manager
systemd-update-utmp.service  loaded active exited  Update UTMP about System Rebo
systemd-u...sessions.service loaded active exited  Permit User Sessions
systemd-v...le-setup.service loaded active exited  Setup Virtual Console
user@0.service               loaded active running User Manager for 0

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.

27 loaded units listed. Pass --all to see loaded but inactive units, too.
To show all installed unit files use 'systemctl list-unit-files'.
[2] Stop a service. The example below means stop 'sendmail' and disable auto-start at booting system.
[root@dlp ~]#
systemctl stop sendmail.service

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

rm '/etc/systemd/system/multi-user.target.wants/sm-client.service'
rm '/etc/systemd/system/multi-user.target.wants/sendmail.service'
[3] There are some SysV services on Fedora 20. Those are controled by chkconfig like below.
[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.

      If you want to list systemd services use 'systemctl list-unit-files'.
      To see services enabled on particular target use
      'systemctl list-dependencies [target]'.

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

# unset auto-start setting for a netconsole

[root@dlp ~]#
chkconfig netconsole off

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