Ubuntu20.4相关命令

iptables -P FORWARD ACCEPT
iptables -P OUTPUT ACCEPT
iptables -F

宝塔纯净版 7.6.0版本 [稳定版本/推荐]
Ubuntu/Deepin全新安装命令：
wget -O install.sh http://v7.hostcli.com/install/install-ubuntu_6.0.sh && sudo bash install.sh

搭建xray
wget -N --no-check-certificate -q -O install.sh "https://raw.githubusercontent.com/paniy/Xray_bash_onekey/main/install.sh" && chmod +x install.sh && bash install.sh

XUI 以后视频讲吧
wget --no-check-certificate https://raw.githubusercontent.com/jinwyp/one_click_script/master/trojan_v2ray_install.sh && chmod +x ./trojan_v2ray_install.sh && ./trojan_v2ray_install.sh
bash <(curl -Ls https://raw.githubusercontent.com/sprov065/x-ui/master/install.sh)

BBR 加速
wget -N --no-check-certificate "https://raw.githubusercontent.com/chiakge/Linux-NetSpeed/master/tcp.sh" && chmod +x tcp.sh && ./tcp.sh

全能工具箱：wget -N https://cdn.jsdelivr.net/gh/Misaka-blog/MisakaLinuxToolbox@master/MisakaToolbox.sh && chmod -R 777 MisakaToolbox.sh && bash MisakaToolbox.sh

Ubuntu开放指定端口：sudo ufw allow 9200【允许外部访问9200端口(tcp/udp)】

防火墙解除
centos操作如下：

停止firewall
systemctl stop firewalld.service

禁止firewall开机启动
systemctl disable firewalld.service

关闭iptables
service iptables stop

去掉iptables开机启动
chkconfig iptables off

oracle Linux操作如下：

停止firewall
systemctl stop firewalld.service

禁止firewall开机启动
systemctl disable firewalld.service

ubuntu操作如下：

Oracle自带的Ubuntu镜像默认设置了Iptable规则，关闭它
apt-get purge netfilter-persistent
reboot

强制删除
rm -rf /etc/iptables && reboot

Ubuntu 下查看哪些端口是开放的，分别是什么进程在监听
sudo netstat -tlpn