• 内网环境centos7.9安装图形页面
• 内网环境制作本地yum源

1. 上传镜像到服务器目录

2. 创建目录并挂载镜像

#创建目录
cd /mnt/
mkdir iso#挂载
mount -o loop ./CentOS-7-x86_64-DVD-2009.iso ./iso  #前面镜像所在目录，后面所挂载得目录#检查
[root@localhost mnt]# df -h
Filesystem               Size  Used Avail Use% Mounted on
devtmpfs                 189G     0  189G   0% /dev
tmpfs                    189G     0  189G   0% /dev/shm
tmpfs                    189G  115M  188G   1% /run
tmpfs                    189G     0  189G   0% /sys/fs/cgroup
/dev/mapper/centos-root  500G   10G  490G   2% /
/dev/sda2                 10G  143M  9.9G   2% /boot
/dev/sda1                 10G   12M   10G   1% /boot/efi
/dev/mapper/centos-opt   243G  476M  243G   1% /opt
/dev/mapper/centos-home   20G   33M   20G   1% /home
/dev/mapper/centos-var   100G  243M  100G   1% /var
tmpfs                     38G     0   38G   0% /run/user/0
tmpfs                     38G     0   38G   0% /run/user/1000
/dev/loop0               4.4G  4.4G     0 100% /mnt/iso

3. yum源制作

#备份yum源
cd /etc/yum.repos.d/
mkdir bak
mv *.repo bak/配置yum源
cp -r ./bak/CentOS-Media.repo ./
vim CentOS-Media.repo# CentOS-Media.repo
#
#  This repo can be used with mounted DVD media, verify the mount point for
#  CentOS-7.  You can use this repo and yum to install items directly off the
#  DVD ISO that we release.
#
# To use this repo, put in your DVD and use it with the other repos too:
#  yum --enablerepo=c7-media [command]
#
# or for ONLY the media repo, do this:
#
#  yum --disablerepo=\* --enablerepo=c7-media [command][c7-media]
name=CentOS-$releasever - Media
baseurl=file:///mnt/iso/file:///media/cdrom/file:///media/cdrecorder/
gpgcheck=1
enabled=1
gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-CentOS-7#修改得两处地方
file:///mnt/iso/
enabled=1

4. 清除缓存及测试

yum clean all
yum repolist
yum -y install vim

5. 安装GNOME图形界面

yum groupinstall "Server with GUI"   #运行以下命令以安装 GNOME 桌面环境（示例）#设置默认启动模式：更新系统的默认启动目标，使系统在启动时自动进入图形界面。运行以下命令：
systemctl set-default graphical.target#重启服务
reboot

6. 安装KDE图形界面

#安装KED界面
yum -y install kde*#重启服务器
reboot

根据自己的需求安装图形页面，研发反馈KDE更好用