SystemD - Journalctl

1 - About

Journalctl is an utility to see the system logs.

3 - Management

3.1 - To see all log of a service


journalctl -u serviceName
# or qualified
journalctl -u serviceName.service

3.2 - To see only log messages for the current boot


journalctl -u serviceName -b
# or qualified
journalctl -u serviceName.service -b

3.3 - To see system logs

to see system logs live …


journalctl -f

3.4 - Log from the last hour

To see logs from e.g. the last hour, and only from the cron daemon:


journalctl --since "1 hour ago" -t CRON


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