better logic

scripts/subinstallers/iptables.sh

@@ -113,8 +113,11 @@ fi
 
 # IP forwarding
 sudo sed -i 's/.*net.ipv4.ip_forward.*/net.ipv4.ip_forward=1/' /etc/sysctl.conf
-sudo sed -i 's/.*vm.overcommit_memory.*/d' /etc/sysctl.conf
-echo "vm.overcommit_memory=1" | sudo tee -a /etc/sysctl.conf
+
+# VM Overcommit Memory
+grep -i "vm.overcommit_memory" /etc/sysctl.conf && sed -i 's/.*vm.overcommit_memory.*/vm.overcommit_memory=1/' /etc/sysctl.conf || echo "vm.overcommit_memory=1" | sudo tee -a /etc/sysctl.conf
+
+# Force re-read of sysctl.conf
 sudo sysctl -p /etc/sysctl.conf
 
 # rsyslog to create /var/log/iptables.log