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systemd-analyze – Find System Boot-up Performance Statistics in Linux

Journalctl stuff

man journald.conf manual page for journald.conf
man journalctl manual page for journalctl

Edit sudo vim /etc/systemd/journald.conf make variable Storage=persistent to make journald store the journal files in /var/log/journal, this will create directory if necessary. This also ensure log files are available from previous boots.

sudo systemctl force-reload systemd-journald to reload journald or restart instead sudo journalctl -u systemd-journald to check status of journal.

some useful flag and inputs:

sudo journalctl -b to see current boot journal only use -b -1 to see last boot entries.
journalctl –list-boots to list all available journaled boots.
sudo journalctl -u pppoe, use u flag to see specified unit files only.
sudo journalctl -k to see kernel messages only
sudo journalctl -p 3 to see only specified error priority messages and more severe.
- 0: emerg
- 1: alert
- 2: crit
- 3: err
- 4: warning
- 5: notice
- 6: info
- 7: debug
-r flag is used to show in reverse chronological order.

some links:
Use journalctl to View Your System's Logs

systemd timers

timedatectl to print current time date on cli
Date to print basic time date only on cli
timedatectl list-timezones to set available time zones
sudo timedatectl set-timezone australia/perth to set timezone

Some links:

Arch Linux systemd/Timers
Putorius Using systemd Timer Units to Schedule Jobs
Linux.com Systemd Timers: Three Use Cases

Freedesktop.org systemd.time — Time and date specifications and systemd.timer — Timer unit configuration