Systemctl tool is use to start, stop, restart, status basic services, also the functionality of both service and chkconfig. 

systemctl ommand is list all running services,

​# systemctl

or
 
# systemctl -a


acpid.service                                    loaded active running   ACPI Event Daemon

atd.service                                      loaded active running   Job spooling tools

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


Enable / Disable Services:

The basic command to enables or disable a service to be started on bootup time. For examble how to enable or disable sshd service.
 
# systemctl enable sshd.service

# systemctl disable sshd.service

How to Start / Stop / Restart few Services.

The following commands are enable / start / stop / restart / status services,

Networks:
 
# systemctl enable  network.service

# systemctl start network.service

# systemctl stop network.service

# systemctl restart network.service

# systemctl status network.service

Apache (HTTPD)
 
# systemctl enable  httpd.service

# systemctl start httpd.service

# systemctl stop httpd.service

# systemctl restart httpd.service

# systemctl status httpd.service

SSH :
# systemctl enable  sshd.service

#systemctl start sshd.service

#systemctl stop sshd.service

#systemctl restart sshd.service

#systemctl status sshd.service

If you have installed any packages additionally can start same as, for example

Memcached :
 
#  systemctl status memcached.service


memcached.service - Memcached

   Loaded: loaded (/usr/lib/systemd/system/memcached.service; enabled)

   Active: active (running) since Thu 2015-02-26 09:54:27 IST; 2h 1min ago

 Main PID: 444 (memcached)

   CGroup: /system.slice/memcached.service

           └─444 /usr/bin/memcached -u memcached -p 11211 -m 64 -c 1024
#  systemctl restart memcached.service

#  systemctl stop memcached.service

or
 
# systemctl restart memcached

# systemctl start memcached

# systemctl status memcached

# systemctl stop memcached