步骤一：安装epel存储库
yum install epel-release -y
步骤二：安装yum-utils工具
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yum install yum-utils
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步骤三：解析rpm包
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yum install rpmconf
rpmconf -a
package-cleanup --leaves
package-cleanup --orphans
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步骤四：安装dnf
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yum install dnf -y
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步骤五：删除软件包管理器
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dnf remove yum yum-metadata-parser<br>rm -Rf /etc/yum
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步骤六：升级
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dnf upgrade<br>
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步骤七：使用dnf安装CentOS 8发行包
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dnf -y upgrade http:
//mirror.bytemark.co.uk/centos/8/BaseOS/x86_64/os/Packages/centos-release-8.0-0.1905.0.9.el8.x86_64.rpm
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步骤八：升级EPEL存储库
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dnf -y upgrade https:
//dl.fedoraproject.org/pub/epel/epel-release-latest-8.noarch.rpm
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步骤九：成功升级EPEL存储库后，请删除所有临时文件
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dnf clean all
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步骤十：删除用于CentOS 7的旧内核内核
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rpm -e `rpm -q kernel`
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步骤十一：删除有冲突的软件包
rpm -e --nodeps sysvinit-tools
步骤十二：
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dnf -y --releasever=8 --allowerasing --setopt=deltarpm=
false
distro-sync
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步骤十三：CentOS 8安装新的内核
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dnf -y install kernel-core
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步骤十四：最后，安装CentOS 8最小软件包。
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dnf -y groupupdate
"Core"
"Minimal Install"
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步骤十五：检查版本
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cat /etc/redhat-release
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