UFW

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cat <<-'EXE'|sudo bash
apt-get update;echo
apt list -a --upgradable
apt-get install -y ufw nmap telnet
EXE

Allow

Name Allow Name Allow
HTTP sudo ufw allow http RDP sudo ufw allow 5900/tcp
OpenSSH sudo ufw allow OpenSSH MySQL sudo ufw allow 3306/tcp
LXD Bridge sudo ufw allow in on lxdbr0 PostgreSQL sudo ufw allow 5432/tcp
LXD Bridge sudo ufw route allow in on lxdbr0 Micro Services sudo ufw allow 9000:9010/tcp
LXD Bridge sudo ufw route allow out on lxdbr0 MinIO Object Storage sudo ufw allow 9800:9801/tcp

Allow » Minikube » Bridge

MINIKUBE_BRIDGE="br-$(docker network ls -fname=minikube --format=json|jq -r '.ID')"
sudo ufw route allow out on ${MINIKUBE_BRIDGE}
sudo ufw status numbered

Status

sudo systemctl status ufw
sudo ufw status verbose
sudo ufw enable
sudo ufw delete allow 3306
sudo ufw status numbered
sudo ufw delete N
sudo ufw delete allow 9800:9801/tcp
sudo ufw delete allow 9000:9010/tcp
sudo ufw delete allow 3306/tcp

Playground

netstat -uap|grep nginx
apt list --installed
sudo ufw status
netstat -lpn
netstat -a
sudo ss -tulpn | grep LISTEN | grep resolve
sudo ss -tulpn | grep LISTEN | grep minio
sudo ss -tulpn | grep LISTEN | grep sshd
sudo ss -tulwn | grep LISTEN
sudo ss -tulpn | grep LISTEN
sudo lsof -i -P -n | grep LISTEN
sudo ss -tulpn     | grep LISTEN
sudo ufw allow 'Nginx HTTP'
sudo ufw app list
sudo ufw status

sudo systemctl status ufw
sudo apt-get install gufw
sudo ufw status numbered
sudo ufw status verbose
sudo ufw disable
sudo ufw enable
sudo ufw status
nc -uv vpn.shahed.biz 1194   # udp
nc -tv vpn.shahed.biz 80     # tcp
nc -tv vpn.shahed.biz 53     # tcp
sudo nmap -sT localhost      # tcp
sudo nmap -sU localhost      # udp
nc -uv localhost 1194        # udp
nc -tv localhost 80          # tcp
sudo -i -u minikube
echo $(ip r g $(minikube ip)|awk '{print $3}'|head -n1)

sudo nmap -sU -sT -p U:1194,T:22,53,443 vpn.shahed.biz

References