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systemd

Cron Replacement

Actively migrate cronjobs to systemd timers. They are much more flexible and provide consistency on systemd systems. These may also be deployed per-user.

job.service

0644 root:root

# Service executes the commands or script from original cronjob.
[Unit]
Description=Cronjob service example.
Requires=cron_example.timer
After=network.target
Wants=network.target

[Service]
Type=simple
ExecStart=/bin/bash -c '/usr/bin/tar -cvJf /srv/test.tar.xz" "/opt/test"'
WorkingDirectory=/opt/test
User=test_user
Group=test_user

[Install]
WantedBy=multi-user.target

job.timer

0644 root:root

# Timer acts as the scheduler allowing for fine-grained scheduling of job.
[Unit]
Description=cron_example.service timer.
Requires=cron_example.service

[Timer]
OnBootSec=1d

[Install]
WantedBy=timers.target
systemctl daemon-reload
systemctl enable job.service job.timer
systemctl start job.timer

Analyze Boot Time

Don't rabbit hole. Usually slow boot times are from connected drives and devices.

systemd-analyze plot > plot.svg

Service Security Exposure

Generate exposure threat ratings for current system services.

systemd-analyze security

Reference1

  1. https://www.freedesktop.org/software/systemd/man/latest/index.html ↩