Initial Settings : Services
[1]. It's possible to display services' status like follows.
# the list of services that are active now
[root@dlp ~]# systemctl -t service
UNIT LOAD ACTIVE SUB DESCRIPTION
atd.service loaded active running Job spooling tools
auditd.service loaded active running Security Auditing Service
chronyd.service loaded active running NTP client/server
crond.service loaded active running Command Scheduler
dbus.service loaded active running D-Bus System Message Bus
.....
.....
user-runtime-dir@0.service loaded active exited /run/user/0 mount wrapper
user@0.service loaded active running User Manager for UID 0
vdo.service loaded active exited VDO volume services
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.
45 loaded units listed. Pass --all to see loaded but inactive units, too.
To show all installed unit files use 'systemctl list-unit-files'.
# list of all services
[root@dlp ~]# systemctl list-unit-files -t service
UNIT FILE STATE
arp-ethers.service disabled
atd.service enabled
auditd.service enabled
autovt@.service enabled
blk-availability.service disabled
.....
.....
user-runtime-dir@.service static
user@.service static
vdo.service enabled
181 unit files listed.
[2]. Stop and turn OFF auto-start setting for a service if you don'd need it. (it's smartd as an example below)
[root@dlp ~]# systemctl stop smartd
[root@dlp ~]# systemctl disable smartd
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