How to find my dnf config files right name ?

[Krallt9]

Hello i'm on centros 8 and try to update on centros 8,5;
So I try the mirror code, but it don't works, i guess i have to change this part : /etc/yum.repos.d/CentOS-Linux-BaseOS.repo
But not sure, i case i'm right , where can i have the right file name on my centros serveur ?
This link "mirrorlist.centos.org" is a exemple link? because he looks to be broke..
Thank's for your help

sudo sed -i -e '/mirrorlist=http://mirrorlist.centos.org/?release=$releasever&arch=$basearch&repo=/ s/^#/#/' -e '/baseurl=http://mirror.centos.org/$contentdir/$releasever// s/^#/#/' -e '/^[baseos]/a baseurl=https://mirror.rackspace.com/centos-vault/8.5.2111/BaseOS/$basearch/os' /etc/yum.repos.d/CentOS-Linux-BaseOS.repo
sudo sed -i -e '/mirrorlist=http://mirrorlist.centos.org/?release=$releasever&arch=$basearch&repo=/ s/^#/#/' -e '/baseurl=http://mirror.centos.org/$contentdir/$releasever// s/^#/#/' -e '/^[appstream]/a baseurl=https://mirror.rackspace.com/centos-vault/8.5.2111/AppStream/$basearch/os' /etc/yum.repos.d/CentOS-Linux-AppStream.repo
sudo sed -i -e '/mirrorlist=http://mirrorlist.centos.org/?release=$releasever&arch=$basearch&repo=/ s/^#/#/' -e '/baseurl=http://mirror.centos.org/$contentdir/$releasever// s/^#/#/' -e '/^[cr]/a baseurl=https://mirror.rackspace.com/centos-vault/8.5.2111/ContinuousRelease/$basearch/os' /etc/yum.repos.d/CentOS-Linux-ContinuousRelease.repo
sudo sed -i -e '/mirrorlist=http://mirrorlist.centos.org/?release=$releasever&arch=$basearch&repo=/ s/^#/#/' -e '/baseurl=http://mirror.centos.org/$contentdir/$releasever// s/^#/#/' -e '/^[devel]/a baseurl=https://mirror.rackspace.com/centos-vault/8.5.2111/Devel/$basearch/os' /etc/yum.repos.d/CentOS-Linux-Devel.repo
sudo sed -i -e '/mirrorlist=http://mirrorlist.centos.org/?release=$releasever&arch=$basearch&repo=/ s/^#/#/' -e '/baseurl=http://mirror.centos.org/$contentdir/$releasever// s/^#/#/' -e '/^[extras]/a baseurl=https://mirror.rackspace.com/centos-vault/8.5.2111/extras/$basearch/os' /etc/yum.repos.d/CentOS-Linux-Extras.repo
sudo sed -i -e '/mirrorlist=http://mirrorlist.centos.org/?release=$releasever&arch=$basearch&repo=/ s/^#/#/' -e '/baseurl=http://mirror.centos.org/$contentdir/$releasever// s/^#/#/' -e '/^[fasttrack]/a baseurl=https://mirror.rackspace.com/centos-vault/8.5.2111/fasttrack/$basearch/os' /etc/yum.repos.d/CentOS-Linux-FastTrack.repo
sudo sed -i -e '/mirrorlist=http://mirrorlist.centos.org/?release=$releasever&arch=$basearch&repo=/ s/^#/#/' -e '/baseurl=http://mirror.centos.org/$contentdir/$releasever// s/^#/#/' -e '/^[ha]/a baseurl=https://mirror.rackspace.com/centos-vault/8.5.2111/HighAvailability/$basearch/os' /etc/yum.repos.d/CentOS-Linux-HighAvailability.repo
sudo sed -i -e '/mirrorlist=http://mirrorlist.centos.org/?release=$releasever&arch=$basearch&repo=/ s/^#/#/' -e '/baseurl=http://mirror.centos.org/$contentdir/$releasever// s/^#/#/' -e '/^[plus]/a baseurl=https://mirror.rackspace.com/centos-vault/8.5.2111/centosplus/$basearch/os' /etc/yum.repos.d/CentOS-Linux-Plus.repo
sudo sed -i -e '/mirrorlist=http://mirrorlist.centos.org/?release=$releasever&arch=$basearch&repo=/ s/^#/#/' -e '/baseurl=http://mirror.centos.org/$contentdir/$releasever// s/^#/#/' -e '/^[powertools]/a baseurl=https://mirror.rackspace.com/centos-vault/8.5.2111/PowerTools/$basearch/os' /etc/yum.repos.d/CentOS-Linux-PowerTools.repo