一、先將iso鏡像文件掛載
#mount /dev/cdrom /mnt
將cdrom掛載到/mnt下
刪除/etc/yum.repos.d/ 目錄下所有文件
新建文件local.repo
vi /etc/yum.repos.d/local.repo
[InstallMedia]
name=CentOS Linux 8
baseurl=file:///mnt/BaseOS
gpgcheck=0
enabled=1
[AppStream]
name=AppStream
baseurl=file:///mnt/AppStream
enabled=1
gpgcheck=0
保存文件local.repo
yum源新建緩存，檢查文件：
yum makecache
yum repolist
三、還有一種方法，把iso下源文件全部拷貝進系統，新建目錄/yum,再對應目錄配置yum源文件
cp -rf /mnt/ /yum/
四、DNF的主要命令
$ dnf --help
usage: dnf [options] COMMAND
List of Main Commands:
alias List or create command aliases
autoremove remove all unneeded packages that were originally installed as dependencies
check check for problems in the packagedb
check-update check for available package upgrades
clean remove cached data
deplist List package's dependencies and what packages provide them
distro-sync synchronize installed packages to the latest available versions
downgrade Downgrade a package
group display, or use, the groups information
help display a helpful usage message
history display, or use, the transaction history
info display details about a package or group of packages
install install a package or packages on your system
list list a package or groups of packages
makecache generate the metadata cache
mark mark or unmark installed packages as installed by user.
module Interact with Modules.
provides find what package provides the given value
reinstall reinstall a package
remove remove a package or packages from your system
repolist display the configured software repositories
repoquery search for packages matching keyword
repository-packages run commands on top of all packages in given repository
search search package details for the given string
shell run an interactive DNF shell
swap run an interactive dnf mod for remove and install one spec
updateinfo display advisories about packages
upgrade upgrade a package or packages on your system
upgrade-minimal upgrade, but only 'newest' package match which fixes a problem that affects your system
DNF最後的這個upgrade-minimal命令，貌似Yum沒有，這個命令看著很不錯。總之，能用DNF，就不要再用yum了。
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