Update cheatsheets

linux/firewall-cmd

@@ -0,0 +1,37 @@
+---
+syntax: markdown
+tags: [tldr, linux]
+source: https://github.com/tldr-pages/tldr.git
+---
+# firewall-cmd
+
+> The firewalld command-line client.
+> More information: <https://firewalld.org/documentation/man-pages/firewall-cmd>.
+
+- View the available firewall zones:
+
+`firewall-cmd --get-active-zones`
+
+- View the rules which are currently applied:
+
+`firewall-cmd --list-all`
+
+- Permanently move the interface into the block zone, effectively blocking all communication:
+
+`firewall-cmd --permanent --zone={{block}} --change-interface={{enp1s0}}`
+
+- Permanently open the port for a service in the specified zone (like port 443 when in the `public` zone):
+
+`firewall-cmd --permanent --zone={{public}} --add-service={{https}}`
+
+- Permanently close the port for a service in the specified zone (like port 80 when in the `public` zone):
+
+`firewall-cmd --permanent --zone={{public}} --remove-service={{http}}`
+
+- Permanently open two arbitrary ports in the specified zone:
+
+`firewall-cmd --permanent --zone={{public}} --add-port={{25565/tcp}} --add-port={{19132/udp}}`
+
+- Reload firewalld to force rule changes to take effect:
+
+`firewall-cmd --reload`