move selinux, firewalld, k3s

active/software_firewalld/firewalld.md

@@ -0,0 +1,23 @@
+# Firewalld
+
+## Notes
+
+```bash
+# Add a port
+firewall-cmd --permanent --add-port=22/tcp
+
+# List active zones
+firewall-cmd --get-active-zones
+
+# Set default zone
+firewall-cmd --set-default-zone=drop
+
+# Set zone for a specific subnet
+firewall-cmd --permanent --zone=drop --add-source=10.244.0.0/16
+
+# Get info about service
+firewall-cmd --info-service=samba
+
+# Get zone information
+firewall-cmd --info-zone=drop
+```