Настройка зеркала Centos 8 steam Couldn't resolve host name

Couldn't resolve host name for http://mirrorlist.centos.org/

Ручной проверенный режим. С него и надо начинать. У нас есть папка /etc/yum.repos.d/, в ней лежит вагон файлов, но основные репозитории которые надо заменить вот:

CentOS Stream 8 - AppStream
CentOS Stream 8 - BaseOS
CentOS Stream 8 - Extras
CentOS Stream 8 - Extras common packages
CentOS Stream 8 - PowerTools

Начнем с конца /etc/yum.repos.d/CentOS-Stream-PowerTools.repo:

[powertools]
name=CentOS Stream $releasever - PowerTools
#mirrorlist=http://mirrorlist.centos.org/?release=$stream&arch=$basearch&repo=PowerTools&infra=$infra
#baseurl=http://mirror.centos.org/$contentdir/$stream/PowerTools/$basearch/os/
baseurl=http://vault.centos.org/$contentdir/$stream/PowerTools/$basearch/os/
gpgcheck=1
enabled=1
gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-centosofficial

/etc/yum.repos.d/CentOS-Stream-Extras-common.repo:

[extras-common]
name=CentOS Stream $releasever - Extras common packages
#mirrorlist=http://mirrorlist.centos.org/?release=$stream&arch=$basearch&repo=extras-extras-common
#baseurl=http://mirror.centos.org/$contentdir/$stream/extras/$basearch/extras-common/
baseurl=http://vault.centos.org/$contentdir/$stream/extras/$basearch/extras-common/
gpgcheck=1
enabled=1
gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-CentOS-SIG-Extras

/etc/yum.repos.d/CentOS-Stream-Extras.repo:

[extras]
name=CentOS Stream $releasever - Extras
#mirrorlist=http://mirrorlist.centos.org/?release=$stream&arch=$basearch&repo=extras&infra=$infra
#baseurl=http://mirror.centos.org/$contentdir/$stream/extras/$basearch/os/
baseurl=http://vault.centos.org/$contentdir/$stream/extras/$basearch/os/
gpgcheck=1
enabled=1
gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-centosofficial

/etc/yum.repos.d/CentOS-Stream-BaseOS.repo:

[baseos]
name=CentOS Stream $releasever - BaseOS
#mirrorlist=http://mirrorlist.centos.org/?release=$stream&arch=$basearch&repo=BaseOS&infra=$infra
#baseurl=http://mirror.centos.org/$contentdir/$stream/BaseOS/$basearch/os/
baseurl=http://vault.centos.org/$contentdir/$stream/BaseOS/$basearch/os/
gpgcheck=1
enabled=1
gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-centosofficial

/etc/yum.repos.d/CentOS-Stream-AppStream.repo:

[appstream]
name=CentOS Stream $releasever - AppStream
#mirrorlist=http://mirrorlist.centos.org/?release=$stream&arch=$basearch&repo=AppStream&infra=$infra
#baseurl=http://mirror.centos.org/$contentdir/$stream/AppStream/$basearch/os/
baseurl=http://vault.centos.org/$contentdir/$stream/AppStream/$basearch/os/
gpgcheck=1
enabled=1
gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-centosofficial

Иногда до обновления нет extras-common, после обновления системы надо дописывать

Так же неполноценные альтернативы, вдруг хватит:

sed -i s/mirror.centos.org/vault.centos.org/g /etc/yum.repos.d/*.repo
sed -i s/^#.*baseurl=http/baseurl=http/g /etc/yum.repos.d/*.repo
sed -i s/^mirrorlist=http/#mirrorlist=http/g /etc/yum.repos.d/*.repo

Еще вариант

cd /etc/yum.repos.d/
sed -i 's/mirrorlist/#mirrorlist/g' /etc/yum.repos.d/CentOS-*
sed -i 's|#baseurl=http://mirror.centos.org|baseurl=http://vault.centos.org|g' /etc/yum.repos.d/CentOS-*