Systemd jednotky

Opakování

• systemctl status sshd
• systemctl stop sshd
• systemctl start sshd
• systemctl restart sshd
• systemctl cat sshd

Nastavení systemd

• /usr/lib/systemd/system/
• /usr/lib/systemd/system/sshd.service
• /etc/systemd/system/ – pro administrátora
• symlinky na /dev/null

Typy „units“:

ls /usr/lib/systemd/system/ | cut -d. -f2

• service
• target
• socket
• timer
• mount
• ...

Použití plného jména:

• systemctl status sshd.service
• systemctl status graphical.target
• systemctl cat sshd.service
• systemctl cat sshd.socket

(Odbočka k socket?)

• systemctl cat graphical.target

Závislosti:

• systemctl list-dependencies sshd
• systemctl list-dependencies graphical.target

Dokumentace:

• man systemd.service, ...
• man systemd.service, man systemd.mount

Timer

• man systemd.timer
• man systemd.time
• man systemd.unit

Naše služba

/etc/systemd/system/ahoj.service:

[Unit]
Description=echo

[Service]
Type=oneshot
ExecStart=/usr/bin/echo Ahoj!

• sudo systemctl daemon-reload
• sudo systemctl start ahoj.service
• sudo systemctl status ahoj.service

/etc/systemd/system/ahoj.timer:

[Unit]
Description=echo timer

[Timer]
OnCalendar=*-*-* *:*:00/10
AccuracySec=1s
Unit=ahoj.service

• sudo systemctl daemon-reload
• sudo systemctl start ahoj.timer
• sudo systemctl status ahoj.service (!)

Uživatelská služba & časovač

mkdir -p ~/.config/systemd/user/

~/.config/systemd/user/gong.service:

[Unit]
Description=Gong

[Service]
Type=oneshot
ExecStart=/usr/bin/mplayer /usr/share/sounds/gnome/default/alerts/sonar.ogg

~/.config/systemd/user/gong.timer:

[Unit]
Description=Gong

[Timer]
OnCalendar=*-*-* *:*:00/10
AccuracySec=1s
Unit=gong.service