CentOS 7.5（1804）安装图形界面
系统版本：https://s1.运维网.com/images/blog/201903/21/992ee34a7f1e3ede65a64629eb54170e.png
1、查询组包
https://s1.运维网.com/images/blog/201903/21/27ac2afbfb3d4404b6ccea8ec0930cee.png
2、安装组包
yum grouplist
https://s1.运维网.com/images/blog/201903/21/8b3192b79bc29e4db7001dbfbb72892d.png
3、如果在最后能看到“Complete!” ，表示安装成功，即可下一步测试
https://s1.运维网.com/images/blog/201903/21/d53355c3d6313bff1af1a32a6d8d76d3.png
4、开启图形化
startx
https://s1.运维网.com/images/blog/201903/21/f658b199a45ec5cad29c65c2627d16b3.png
5、最终看到此界面
https://s1.运维网.com/images/blog/201903/21/c97ad57f6f47da8b41ded0df3f5d2ccb.png
6、查看当前系统的运行级别
runlevel
https://s1.运维网.com/images/blog/201903/22/e165f187fa6da1281ed17ba8f0f571e4.png
N 5表示图形化
N 3表示多用户字符界面
其他等级可查询相关文档
7、修改系统的开机默认运行级别
https://s1.运维网.com/images/blog/201903/22/0369177534cf86779201cc9934f16024.png
https://s1.运维网.com/images/blog/201903/22/a5a9a1fe92a23e043887d4610644f6fc.png
然后reboot重启即可进入图形化
注：
在安装组包过程中如果遇到
file /boot/efi/EFI/centos from install of fwupdate-efi-12-5.el7.centos.x86_64 conflicts with file from package grub2-common-1:2.02-0.65.el7.centos.2.noarch
即https://s1.运维网.com/images/blog/201903/21/c7e31e0b133094f0e2320c86a4d69211.png
解决办法：
法1：
yumupgrade -y把所有安装包升级一遍
https://s1.运维网.com/images/blog/201903/21/9f937c49d65b8b15267031e419cc5af5.png
法2：
yum update grub2-common
yum install fwupdate
安装成功后，再去安装组包即可
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