If you want open port on this CIS image
https://medium.com/@venkateshprasaddasari/install-postgres-16-on-cis-ubuntu-22-04-056da68aee18
sudo apt-get update
apt install ufw
sudo apt-get install iptables-persistent
sudo nft insert rule inet filter input tcp dport {db_port} accept
sudo iptables -A INPUT -p tcp --dport {db_port} -m state --state NEW -j ACCEPT
sudo netfilter-persistent save
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