Systemd Praxis Lösungen: Unterschied zwischen den Versionen
Zur Navigation springen
Zur Suche springen
| (4 dazwischenliegende Versionen desselben Benutzers werden nicht angezeigt) | |||
| Zeile 123: | Zeile 123: | ||
[Install] | [Install] | ||
WantedBy=default.target | WantedBy=default.target | ||
| − | + | * tail -n 3 /tmp/test-system.log | |
| − | + | ||
| − | + | <!-----> | |
| + | test-system-3 Tue 10 Jan 2023 12:17:37 PM CET | ||
| + | test-system-2 Tue 10 Jan 2023 12:17:37 PM CET | ||
| + | test-system-1 Tue 10 Jan 2023 12:17:37 PM CET | ||
| + | <span id="analyse-des-bootvorgangs-mit-journalctl"></span> | ||
| + | = Analyse des Bootvorgangs mit journalctl = | ||
| + | |||
| + | * journalctl -b | ||
| + | * journalctl -b | grep “Network driver” | ||
| + | * journalctl -b | grep usb | ||
| + | * journalctl -b -u date1 | ||
| + | * journalctl -b -u date2 | ||
| + | * journalctl -b -u date3 | ||
| + | |||
| + | <!-----> | ||
| + | <span id="erstellen-von-timer-ersatz-von-cron-und-at"></span> | ||
| + | = Erstellen von Timer (Ersatz von cron und at) = | ||
| + | |||
| + | <span id="aufgabe-1"></span> | ||
| + | == Aufgabe 1 == | ||
| + | |||
| + | * cat /etc/systemd/system/date1.timer | ||
| + | |||
| + | <!-----> | ||
| + | [Unit] | ||
| + | Description=Run date1.service every 2 minutes | ||
| + | |||
| + | [Timer] | ||
| + | OnUnitActiveSec=2m | ||
| + | [Install] | ||
| + | WantedBy=timers.target | ||
| + | * systemctl stop date1.service | ||
| + | * systemctl start date1.timer | ||
| + | * Wenn der Service noch aktiv ist kann es nicht durch den Timer getriggert werden | ||
| + | |||
| + | <!-----> | ||
| + | <span id="aufgabe-2"></span> | ||
| + | == Aufgabe 2 == | ||
| + | |||
| + | * cat /etc/systemd/system/get-octett.service | ||
| + | |||
| + | <!-----> | ||
| + | [Unit] | ||
| + | Description=Get Octett | ||
| + | |||
| + | [Service] | ||
| + | Type=simple | ||
| + | ExecStart=/usr/local/sbin/get-octett | ||
| + | |||
| + | [Install] | ||
| + | WantedBy=multi-user.target | ||
| + | * cat /etc/systemd/system/get-octett.timer | ||
| + | |||
| + | <!-----> | ||
| + | [Unit] | ||
| + | Description=Get Octett | ||
| + | |||
| + | [Timer] | ||
| + | OnBootSec=10s | ||
| + | |||
| + | [Install] | ||
| + | WantedBy=timers.target | ||
Aktuelle Version vom 11. Januar 2023, 07:47 Uhr
Erstellen von Units
- cat /etc/systemd/system/date1.service
[Unit] Description=Simple Unit [Service] Type=simple ExecStart=/usr/local/sbin/test-system.sh 1 [Install] WantedBy=default.target
- cat /etc/systemd/system/date2.service
[Unit] Description=Simple Unit [Service] Type=simple ExecStart=/usr/local/sbin/test-system.sh 2 [Install] WantedBy=default.target
- cat /etc/systemd/system/date3.service
[Unit] Description=Simple Unit [Service] Type=simple ExecStart=/usr/local/sbin/test-system.sh 3 [Install] WantedBy=default.target
- systemctl start date1
- systemctl start date2
- systemctl start date3
- tail /tmp/test-system.log
Analyse der gestarteten Units
- RemainAfterExit=yes hinterlässt den Service im activen Zustand
- systemctl status date3
● date3.service - Simple Unit
Loaded: loaded (/etc/systemd/system/date3.service; disabled; vendor preset: enabled)
Active: active (exited) since Tue 2023-01-10 11:17:02 CET; 40min ago
Main PID: 11089 (code=exited, status=0/SUCCESS)
Tasks: 0 (limit: 1129)
Memory: 0B
CPU: 0
CGroup: /system.slice/date3.service
Jan 10 11:17:02 debian-test systemd[1]: Starting Simple Unit...
Jan 10 11:17:02 debian-test systemd[1]: Finished Simple Unit.
- systemctl status date1
● date1.service - Simple Unit Loaded: loaded (/etc/systemd/system/date1.service; disabled; vendor preset: enabled) Active: inactive (dead) since Tue 2023-01-10 12:02:16 CET; 46s ago Process: 13868 ExecStart=/usr/local/sbin/test-system.sh 1 (code=exited, status=0/SUCCESS) Main PID: 13868 (code=exited, status=0/SUCCESS) CPU: 7ms Jan 10 12:02:16 debian-test systemd[1]: Starting Simple Unit... Jan 10 12:02:16 debian-test systemd[1]: date1.service: Succeeded. Jan 10 12:02:16 debian-test systemd[1]: Finished Simple Unit.
Unit Abhängigkeiten definieren
- systemctl enable date1
- systemctl enable date2
- systemctl enable date3
- reboot
- Die Skripte werden in einer zufälligen Reihenfolge gestartet
- cat /etc/systemd/system/date1.service
[Unit] Description=Simple Unit Wants=date2.service After=date2.service [Service] Type=oneshot ExecStart=/usr/local/sbin/test-system.sh 1 [Install] WantedBy=default.target
- cat /etc/systemd/system/date2.service
[Unit] Description=Simple Unit Wants=date3.service After=date3.service [Service] Type=oneshot ExecStart=/usr/local/sbin/test-system.sh 2 [Install] WantedBy=default.target
- cat /etc/systemd/system/date3.service
[Unit] Description=Simple Unit [Service] Type=oneshot ExecStart=/usr/local/sbin/test-system.sh 3 [Install] WantedBy=default.target
- tail -n 3 /tmp/test-system.log
test-system-3 Tue 10 Jan 2023 12:17:37 PM CET test-system-2 Tue 10 Jan 2023 12:17:37 PM CET test-system-1 Tue 10 Jan 2023 12:17:37 PM CET
Analyse des Bootvorgangs mit journalctl
- journalctl -b
- journalctl -b | grep “Network driver”
- journalctl -b | grep usb
- journalctl -b -u date1
- journalctl -b -u date2
- journalctl -b -u date3
Erstellen von Timer (Ersatz von cron und at)
Aufgabe 1
- cat /etc/systemd/system/date1.timer
[Unit] Description=Run date1.service every 2 minutes [Timer] OnUnitActiveSec=2m [Install] WantedBy=timers.target
- systemctl stop date1.service
- systemctl start date1.timer
- Wenn der Service noch aktiv ist kann es nicht durch den Timer getriggert werden
Aufgabe 2
- cat /etc/systemd/system/get-octett.service
[Unit] Description=Get Octett [Service] Type=simple ExecStart=/usr/local/sbin/get-octett [Install] WantedBy=multi-user.target
- cat /etc/systemd/system/get-octett.timer
[Unit] Description=Get Octett [Timer] OnBootSec=10s [Install] WantedBy=timers.target