How to do it...

At the command line, type the following:

$ systemctl

You should be dropped into a list of systemd units; this is a good initial overview of every unit systemd is aware of, but it's very noisy (as seen in the following screenshot) and what we specifically want to see are daemons (because of our gothic streak):

$ systemctl list-units --type service

You should be given a list of services and their statuses.

This view is better, but it also shows failed and exited services, for example, on our Vagrant instance, we should see the following:

If I want to exclude these, I can use the following command:

$ systemctl list-units --type service --state running

Now we get a much more condensed list, with 17 items in total:

UNIT                     LOAD   ACTIVE SUB     DESCRIPTION
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
getty@tty1.service       loaded active running Getty on tty1
gssproxy.service         loaded active running GSSAPI Proxy Daemon
lvm2-lvmetad.service     loaded active running LVM2 metadata daemon
NetworkManager.service   loaded active running Network Manager
polkit.service           loaded active running Authorization Manager
postfix.service          loaded active running Postfix Mail Transport Agent
rpcbind.service          loaded active running RPC bind service
rsyslog.service          loaded active running System Logging Service
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-udevd.service    loaded active running udev Kernel Device Manager
tuned.service            loaded active running Dynamic System Tuning Daemon

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.

17 loaded units listed. Pass --all to see loaded but inactive units, too.
To show all installed unit files use 'systemctl list-unit-files'.