Integrating firewalld into node_exporter script

Signed-off-by: Georg <georg@lysergic.dev>

scripts/sh/deploy_node_exporter.sh

@@ -27,6 +27,13 @@ ExecStart=/opt/node_exporter/node_exporter --web.listen-address=":9200"
 WantedBy=multi-user.target
 EOF
 systemctl enable --now node_exporter
+if [ -x $(command -v firewall-cmd) ] 
+then
+firewall-cmd --zone=internal --add-port=9200/tcp --permanent
+firewall-cmd --reload
+else
+echo "No firewalld, skipping."
+fi
 echo "OK"
 else
 echo "Found traces of an existing installation. Aborted."