I forget about this all the time, so here are some commands I often use for debugging/devops

systemd

    systemctl list-units
    
    systemctl status unit_name
    service unit_name start|stop|status

Some apps have logs in a directory (often /var/log), some can be read directly using journalctl:

journalctl -u unit_name --since "2019-12-04 00:00:00" --until "2019-12-05 23:00" 

journalctl -u unit_name --follow

network

$ netstat -ntlp

Open files

ulimit -n
lsof -p 13 | wc -l
lsof -p $(pgrep ds_proxy) | wc -l

htop

htop is pretty useful, it’s interesting to see where the numbers come from under the hood: htop explained.

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