Monitoring files and directories

How to change editor for “systemctl edit command”.

Add to .bashrc / .zshrc:

 export SYSTEMD_EDITOR=vim

Add to /etc/sudoers:

 Defaults	env_keep += "SYSTEMD_EDITOR"

Get / set default target when booting up:

$ systemctl get-default
$ systemctl set-default ...target

Create a new service:

sudo systemctl edit --force --full new.service

Limit CPU usage for user:

sudo systemctl set-property user-1001.slice CPUQuota=10%
sudo systemctl daemon-reload

Limit IO read rate to 1MB/sec for user:

sudo systemctl set-property user-1001.slice BlockIOReadBandwidth="/dev/sda 1M"
sudo systemctl daemon-reload

journald log files:

• transient in /run/log/journal/
• persistent in /var/log/journal/ (create directory to enable)

journald log entries since last boot:

journalctl -b