Useful Commands/Service Management

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systemctl

Purpose Command
Monitor
journalctl -u llama-swap --since "10:20"
journalctl -u llama-swap --since "10 minutes ago"
journalctl -u llama-swap --since today

systemctl status llama-swap
Setup
sudo systemctl disable llama-swap
sudo systemctl daemon-reload

sudo ln -s /home/xxx/yyy/llama-swap.service llama.service
sudo systemctl enable llama-swap
sudo systemctl daemon-reload
Control
systemctl start  nginx
systemctl stop   nginx
systemctl reload nginx
systemctl reload systemd-networkd
List
systemctl -t service

Run Level

Run Level Description
0 halt
1 single user mode
2 Multi-user, without NFS
3 Full multi-user mode
4 unused
5 X11
6 reboot