Oracle云服务器关闭防火墙

sudo iptables -F
sudo iptables -X
sudo iptables -t nat -F
sudo iptables -t nat -X
sudo iptables -t mangle -F
sudo iptables -t mangle -X
sudo iptables -P INPUT ACCEPT
sudo iptables -P FORWARD ACCEPT
sudo iptables -P OUTPUT ACCEPT

sudo netfilter-persistent save

sudo systemctl stop nftables
sudo systemctl disable nftables
sudo nft flush ruleset