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 systemctl start apache2
 systemctl stop apache2
 systemctl enable apache2
 systemctl disable apache2
 systemctl status apache2

Config files:

/etc/systemd/network

DNS=...
DHCP=..
Gateway=..
Address=..
Domains=..
...

Check man systemd.network

With the adoption of systemd, there is now a centralized mechanism for the creation of temporary files and directories. A service wishing to use this method can remove mkdir commands in its own startup script and instead place a .conf file in /etc/tmpfiles.d, /run/tmpfiles.d, or /usr/lib/tmpfiles.d, with Ubuntu services seeming to prefer the last option.

The format of these files is the following:

  #Type Path        Mode UID  GID  Age Argument
  d     /run/user   0755 root root 10d -
  L     /tmp/foobar -    -    -    -   /dev/null

Further information can be found using man tmpfiles.d

Init scripts are located here:

/etc/systemd/system/
/lib/systemd/system/
...

Example init scripts:

[Unit]
Description=Calibre Server
After=network.target
 
StartLimitIntervalSec=500
StartLimitBurst=5
 
[Service]
Type=forking
PIDFile=/var/run/calibre-server.pid
Restart=on-failure
RestartSec=5s
ExecStart=/usr/bin/calibre-server \
        --daemonize \
        --port 32452 \
        --pidfile /run/calibre-server.pid \
    --enable-local-write \
    --log=/var/log/calibre.log \
        /home/calibre/db \
        /home/calibre/en \
        /home/calibre/romantikus \
        /home/calibre/paperbooks
 
[Install]
WantedBy=multi-user.target

[Unit]
Description=Calibre Book Importer
After=network.target calibre.service
 
[Service]
Type=oneshot
ExecStart=/home/calibre/import-books.sh
KillMode=mixed
 
[Install]
WantedBy=multi-user.target

• forking
• oneshot
• …

# TODO!!!

systemctl daemon-reload