Systemd systemctl

Example

• cat /etc/systemd/system/chat.service

[Unit]
Description=chat service
After=network.target syslog.target

[Service]
Type=simple
ExecStart=/bin/bash -c "/bin/netcat -l -p 3333 > /tmp/chat.log"
User=root

[Install]
WantedBy=multi-user.target

Systemctl

Reload

• systemctl daemon-reload

Start

• systemctl start chat.service

Stop

• systemctl stop chat.service

Enable

• systemctl enable chat.service

Created symlink from /etc/systemd/system/multi-user.target.wants/chat.service to /etc/systemd/system/chat.service.

Disable

• systemctl disable chat.service

Removed symlink /etc/systemd/system/multi-user.target.wants/chat.service.

Reload

• systemctl reload

Restart

• systemctl restart

Is enabled

• systemctl is-enabled chat.service

disabled

Status

• systemctl status chat.service

● chat.service - chat service
   Loaded: loaded (/etc/systemd/system/chat.service; disabled; vendor preset: enabled)
   Active: active (running) since Di 2017-10-24 16:20:26 CEST; 17s ago
 Main PID: 10949 (bash)
   CGroup: /system.slice/chat.service
           ├─10949 /bin/bash -c /bin/netcat -l -p 3333 > /tmp/chat.log
           └─10951 /bin/netcat -l -p 3333

Okt 24 16:20:26 bajor.xinux.lan systemd[1]: Started chat service.

List Units

• systemctl list-units

UNIT                                                                                                LOAD   ACTIVE SUB       DESCRIPTION
proc-sys-fs-binfmt_misc.automount                                                                   loaded active running   Arbitrary Executable File Formats File System Automount Point
sys-devices-LNXSYSTM:00-LNXSYBUS:00-PNP0A08:00-device:02-ATK0110:00-hwmon-hwmon1.device             loaded active plugged   /sys/devices/LNXSYSTM:00/LNXSYBUS:00/PNP0A08:00/device:02/ATK0110:00/hwmon/hwmon1
sys-devices-pci0000:00-0000:00:01.0-0000:01:00.0-hwmon-hwmon0.device                                loaded active plugged   /sys/devices/pci0000:00/0000:00:01.0/0000:01:00.0/hwmon/hwmon0
...

service files anzeigen

• systemctl list-units
• systemctl list-unit-files
• systemctl --failed

rechner herunterfahren

• systemctl isolate halt
• systemctl poweroff
• systemctl suspend
• systemctl hibernate