Main Options
`ufw` provides essential management functions such as checking firewall status, adding/removing rules, and enabling/disabling the firewall.
1. Firewall Status/Basic Management
2. Add/Delete Rules
3. Other Main Options
Generated command:
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Description:
`ufw` Executes the command.
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Usage Examples and Practical Tips
We present usage examples and common patterns that you must know when using `ufw` in real server operations.
Points to Note When Operating ufw
Firewall settings can completely cut off server access, so be sure to check the following items.
- Blocking SSH access (port 22) may prevent remote access to the server.
- Always allow the SSH port in advance with `ufw allow 22`.
- Always check the application results with `ufw status` before applying rules.
- 'Delete by Number' feature is useful for preventing mistakes.
Enable/Disable Firewall
sudo ufw enableCommands to turn the firewall on or off.
Allow Specific Port
sudo ufw allow 22Example: Allow only the SSH port (22).
Allow Access from Specific IP Only
sudo ufw allow from 203.0.113.5An example of allowing only a specific IP.
Delete Rule (by Number)
sudo ufw delete 2Delete a rule with the number checked via `ufw status numbered`.