或许真的到了放弃centos7的时间了。
今天折腾mdBook Rust，然后发现竟然不支持centos7 原因是GLIBC太老了
但是GLIBC 和系统核心相关，升级的话 还是非常麻烦
只好尝试升级到Centos Stream 8
其实很想用archlinux，但
安装epel-relase、yum-utils和rpmconf
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| yum install yum-utils epel-release -y
yum install rpmconf -y
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安装前检查
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| rpmconf -a
package-cleanup --leaves
package-cleanup --orphans
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安装dnf 并执行更新
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| yum install dnf -y
dnf remove yum yum-metadata-parser -y && rm -rf /etc/yum
dnf upgrade -y
dnf upgrade https://mirrors.bfsu.edu.cn/centos-vault/8.0.1905/BaseOS/x86_64/os/Packages/centos-release-8.0-0.1905.0.9.el8.x86_64.rpm -y
dnf upgrade https://dl.fedoraproject.org/pub/epel/epel-release-latest-8.noarch.rpm -y
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删除无用文件、CentOS 7的内核、更换Vault源和移除无法升级的包并安装CentOS 8的内核
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| dnf clean all
rpm -e `rpm -q kernel`
rpm -e --nodeps sysvinit-tools
minorver=8.0.1905
sudo sed -e "s|^mirrorlist=|#mirrorlist=|g" \
-e "s|^#baseurl=http://mirror.centos.org/\$contentdir/\$releasever|baseurl=https://mirrors.tuna.tsinghua.edu.cn/centos-vault/$minorver|g" \
-i.bak \
/etc/yum.repos.d/CentOS-*.repo
dnf remove python36-rpmconf -y
dnf --releasever=8 --allowerasing --setopt=deltarpm=false distro-sync -y
dnf groupupdate "Core" "Minimal Install" -y
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升级到Centos Stream 8
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| dnf install \
http://mirror.centos.org/centos/8-stream/BaseOS/x86_64/os/Packages/centos-stream-repos-8-4.el8.noarch.rpm \
http://mirror.centos.org/centos/8-stream/BaseOS/x86_64/os/Packages/centos-stream-release-8.6-1.el8.noarch.rpm \
http://mirror.centos.org/centos/8-stream/BaseOS/x86_64/os/Packages/centos-gpg-keys-8-4.el8.noarch.rpm \
-y
dnf distro-sync --allowerasing -y
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最后清理dnf 然后更新
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| dnf clean packages
reboot
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进入系统后 再更新一次
后面还需要大量工作要处理，如果不是非常必要，建议直接重装