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Add firewall rules

1. iptables (Common Across Distributions)

To add a port opening with iptables, you can use the following commands. Make sure to adjust the port number and protocol (tcp or udp) as needed.

Open port 8080 for TCP:

sudo iptables -A INPUT -p tcp --dport 8080 -j ACCEPT

Save the configuration (on Debian-based systems):

sudo iptables-save | sudo tee /etc/iptables/rules.v4

Save the configuration (on Red Hat-based systems):

sudo service iptables save

2. firewalld (Fedora, CentOS 7+, RHEL 7+)

Open port 8080 for TCP:

sudo firewall-cmd --zone=public --add-port=8080/tcp --permanent
sudo firewall-cmd --reload

For multiple ports (e.g., 8080 and 9090):

sudo firewall-cmd --zone=public --add-port=8080/tcp --permanent
sudo firewall-cmd --zone=public --add-port=9090/tcp --permanent
sudo firewall-cmd --reload

3. ufw (Ubuntu, Debian-based)

Open port 8080 for TCP:

sudo ufw allow 8080/tcp

For multiple ports (e.g., 8080 and 9090):

sudo ufw allow 8080/tcp
sudo ufw allow 9090/tcp

Enable ufw if not already enabled:

sudo ufw enable

4. nftables (Newer Systems)

Open port 8080 for TCP:

sudo nft add rule ip filter input tcp dport 8080 accept

For multiple ports (e.g., 8080 and 9090):

sudo nft add rule ip filter input tcp dport {8080,9090} accept

Save the configuration:

sudo nft list ruleset > /etc/nftables.conf