Whether or not you like SystemD it is a reality of the world we currently live in, and anyone managing a modern operating system is likely to have a need to interact with it.
Utilities such as service,ckconfig and update.rc-d have largely been replaced with systemctl and it's syntax isn't always as simple and intuitive - especially when you're used to the other ways of doing things
## Interacting with services
# Start service foo
# equiv: service foo start
systemctl start foo
# Stop service foo
# equiv: service foo stop
systemctl stop foo
# Restart service foo
# equiv: service foo restart
systemctl restart foo
# Reload service foo
# equiv: service foo reload
systemctl reload foo
# Conditional restart service foo
# equiv: service foo condrestart
systemctl condrestart foo
# Get status of service foo
# equiv: service foo status
systemctl status foo
## Managing services
# Disable service foo
# equiv: chkconfig foo off
systemctl disable foo.service
# Enable service foo
# equiv: chkconfig foo on
systemctl enable foo.service
# Check whether foo is enabled
# equiv: chkconfig foo
systemctl is-enabled foo.service
# Check what levels foo runs at
# equiv: chkconfig foo --list
ls /etc/systemd/system/*.wants/foo.service
## Checking runlevels and services
# List service unit files (what would have been init scripts)
# equiv: chkconfig --list
systemctl list-unit-files --type=service
# List services that run at runlevel 5 (graphical mode)
# equiv: chkconfig --list | grep 5:on
systemctl list-dependancies graphical.target
## General
# Force systemd to rescan unit files after you've made changes
# No equiv
systemctl daemon-reload
# Change to runlevel 3
# equiv: telinit 3
systemctl isolate runlevel3.target
# Make runlevel 3 the default runlevel
ln -sf /lib/systemd/system/runlevel3.target /etc/systemd/system/default.target
# Specifying runlevel from Grub
#
# Edit the kernel command line in grub like you would to add init=/bin/bash
# but add
systemd.unit=runlevel3.target #or
system.unit=resuce.target