根据经验，选择安装包时应该按最小化原则，即不需要的或者不确定是否需要的就不安装，这样可以最大程度上确保系统安全。
如何选择CentOS 7.6系统组件安装包
如果安装过程落了部分包组或者其他伙伴安装时没选，再安装后可以按如下方式补上安装时未安装的包组：bc平台搭建q<115.28.8.00.9.9>
yum groupinstall “Compatibility libraries” “Base” “Development tools”
yum groupinstall “debugging Tools” “Dial-up Networking Support”
可以通过yum groupinfo 包组查看具体安装的组件。

[root@192168088101_vsftp_server ~]# yum groupinfo “Development tools”
Group: Compatibility Libraries
Group-Id: compat-libraries
Description: Compatibility libraries for applications built on previous versions of CentOS Linux.
Mandatory Packages:
compat-db47
compat-exiv2-023
compat-glibc
compat-libcap1
compat-libf2c-34
compat-libgfortran-41
compat-libtiff3
compat-openldap
libpng12
openssl098e
下面安装7.6后登陆系统的时候yum grouplist查看选包的情况
[root@192168088101_vsftp_server ~]# yum grouplist
Available Environment Groups:
Minimal Install
Compute Node
Infrastructure Server
File and Print Server
Basic Web Server
Virtualization Host
Server with GUI
GNOME Desktop
KDE Plasma Workspaces
Development and Creative Workstation
Available Groups:
Compatibility Libraries
Console Internet Tools
Development Tools
Graphical Administration Tools
Legacy UNIX Compatibility
Scientific Support
Security Tools
Smart Card Support
System Administration Tools
System Management
Done
可以看到除了我们选择的外，系统还是默认安装了一些额外的软件包组。
注意：
不要使用yum的删除功能删除软件，会删除相关依赖，导致意外问题