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systemd, systemctl

systemd is a system and service manager for Linux operating systems. It is designed to provide a more efficient and unified way to manage system processes and services. Here are some key features and benefits of systemd:

  • Service Management: Systemd manages system services and daemons, allowing you to start, stop, enable, disable, and monitor services.
  • Unit Files: Systemd uses unit files to define services, sockets, devices, mounts, and other system resources. THese files provide a standardized way to configure and manage system resources.
  • Logging: System includes a built-in logging system called journald, which collects and manages log data from various sources.
  • Timers: System can replace traditional cron jobs with timer units, providing more flexibility and integration with the rest of the system.

The main command used to control systemd is systemctl.

Service Management

??Units??

To enable/disable a service to start at boot:

sudo systemctl enable unit-name
sudo systemctl disable unit-name

Journal and Logging

journalctl

-r to see latest logs

Times

https://coreos.com/os/docs/latest/scheduling-tasks-with-systemd-timers.html

Listing timers

You can also list all timers enabled in your system using

$ systemctl list-timers
--all to list all timers.

Enabling/Stopping timers

$ systemctl start *.timer
$ systemctl stop *.timer

Creating timers

  1. Create a *.service file. Example:
[Unit]
Description=Prints date into /tmp/date file

[Service]
Type=oneshot
ExecStart=/usr/bin/sh -c '/usr/bin/date >> /tmp/date'
  1. Create *.date file. Example:
[Unit]
Description=Run date.service every 10 minutes

[Timer]
OnCalendar=*:0/10

This config will run date.service every 10 minutes.

location of timers:
/etc/systemd/system/

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