在centOS7下安装GUI图形界面
yum groupinstall “GNOME Desktop” “Graphical Administration Tools”
ln -sf /lib/systemd/system/runlevel5.target /etc/systemd/system/default.target
reboot

uos系统中安装vncserver以便于远程图形化管理和使用。安装vncserver的步骤如下：
apt update
sudo apt install xfce4 xfce4-goodies
apt install tightvncserver
vncserver
vncserver -kill :1
mv ~/.vnc/xstartup ~/.vnc/xstartup.bak
vim ~/.vnc/xstartup
#!/bin/bash
xrdb $HOME/.Xresources
startxfce4 &
chmod +x ~/.vnc/xstartup

NC安装
yum install nc -y
yum install nmap -y