Useful Commands/Service Management: Difference between revisions

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== systemctl ==
== systemctl ==
{| class="wikitable"
{| class="wikitable"
! Purpose || Command  
! Purpose || Command
|-
|-
| List ||
| Monitor ||
<syntaxhighlight lang="bash">
<syntaxhighlight lang="bash">
systemctl -t service
journalctl -u llama-swap -n 10 -f
systemctl list-units -t service
 
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
</syntaxhighlight>
</syntaxhighlight>
|-
|-
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<syntaxhighlight lang="bash">
<syntaxhighlight lang="bash">
sudo systemctl disable llama-swap
sudo systemctl disable llama-swap
sudo rm -f /etc/systemd/system/llama-swap.service
sudo systemctl daemon-reload
sudo systemctl daemon-reload


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sudo systemctl enable llama-swap
sudo systemctl enable llama-swap
sudo systemctl daemon-reload
sudo systemctl daemon-reload
</syntaxhighlight>
|-
| Monitor ||
<syntaxhighlight lang="bash">
systemctl status llama-swap
systemctl status llama-swap.service
</syntaxhighlight>
</syntaxhighlight>
|-
|-
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systemctl reload nginx
systemctl reload nginx
systemctl reload systemd-networkd
systemctl reload systemd-networkd
</syntaxhighlight>
|-
| List ||
<syntaxhighlight lang="bash">
systemctl -t service
</syntaxhighlight>
</syntaxhighlight>
|}
|}
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{| class="wikitable"
{| class="wikitable"
! Run Level || Description
! Target || ! Description
|-
| align="center" | 0 || halt
|-
|-
| align="center" | 1 || single user mode
| multi-user.target || Multi-user mode (CLI) (Equivalent to Runlevel 3)
|-
|-
| align="center" | 2 || Multi-user, without NFS
| graphical.target || Graphical mode (GUI) (Equivalent to Runlevel 5)
|-
|-
| align="center" | 3 || Full multi-user mode
| rescue.target || Rescue mode (Equivalent to Runlevel 1)
|-
|-
| align="center" | 4 || unused
| emergency.target || Emergency mode (Equivalent to Runlevel 0)
|-
|-
| align="center" | 5 || X11
| reboot.target || Reboot
|-
|-
| align="center" | 6 || reboot
| poweroff.target || Power off
|}
|}

Latest revision as of 02:48, 10 September 2026

systemctl

Purpose Command
Monitor
journalctl -u llama-swap -n 10 -f

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

Target ! Description
multi-user.target Multi-user mode (CLI) (Equivalent to Runlevel 3)
graphical.target Graphical mode (GUI) (Equivalent to Runlevel 5)
rescue.target Rescue mode (Equivalent to Runlevel 1)
emergency.target Emergency mode (Equivalent to Runlevel 0)
reboot.target Reboot
poweroff.target Power off