CIS Hardened Image Level 1 on Ubuntu Linux Server 22.04 LTS
Center for Internet Security | 2.0.0.13Linux/Unix, Ubuntu 22.04 - 64-bit Amazon Machine Image (AMI)
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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