for file in /etc/yum.repos.d/epel{,-testing}.repo; do
  [ -f "$file" ] || continue
  [ -e "$file.bak" ] || sudo cp "$file" "$file.bak" || exit 1
done
sudo dnf install -y epel-release
sudo sed -e 's|^metalink=|#metalink=|g' \
  -e 's|^#baseurl=https://download.example/pub/epel/|baseurl=https://mirrors.aliyun.com/epel/|g' \
  -i /etc/yum.repos.d/epel{,-testing}.repo
sudo dnf makecache

[epel]
name=Extra Packages for Enterprise Linux $releasever
baseurl=https://mirrors.aliyun.com/epel/$releasever/Everything/$basearch/
enabled=1
gpgcheck=1
gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-EPEL-$releasever

dnf repoinfo epel | grep -i baseurl

for file in /etc/yum.repos.d/epel{,-testing}.repo; do
  [ -f "$file" ] || continue
  [ -e "$file.bak" ] || sudo cp "$file" "$file.bak" || exit 1
done
sudo dnf install -y epel-release
sudo sed -e 's|^metalink=|#metalink=|g' \
  -e 's|^#baseurl=https://download.example/pub/epel/|baseurl=https://repo.huaweicloud.com/epel/|g' \
  -i /etc/yum.repos.d/epel{,-testing}.repo
sudo dnf makecache

[epel]
name=Extra Packages for Enterprise Linux $releasever
baseurl=https://repo.huaweicloud.com/epel/$releasever/Everything/$basearch/
enabled=1
gpgcheck=1
gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-EPEL-$releasever

dnf repoinfo epel | grep -i baseurl

for file in /etc/yum.repos.d/epel{,-testing}.repo; do
  [ -f "$file" ] || continue
  [ -e "$file.bak" ] || sudo cp "$file" "$file.bak" || exit 1
done
sudo dnf install -y epel-release
sudo sed -e 's|^metalink=|#metalink=|g' \
  -e 's|^#baseurl=https://download.example/pub/epel/|baseurl=https://mirrors.cloud.tencent.com/epel/|g' \
  -i /etc/yum.repos.d/epel{,-testing}.repo
sudo dnf makecache

[epel]
name=Extra Packages for Enterprise Linux $releasever
baseurl=https://mirrors.cloud.tencent.com/epel/$releasever/Everything/$basearch/
enabled=1
gpgcheck=1
gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-EPEL-$releasever

dnf repoinfo epel | grep -i baseurl

for file in /etc/yum.repos.d/epel{,-testing}.repo; do
  [ -f "$file" ] || continue
  [ -e "$file.bak" ] || sudo cp "$file" "$file.bak" || exit 1
done
sudo dnf install -y epel-release
sudo sed -e 's|^metalink=|#metalink=|g' \
  -e 's|^#baseurl=https://download.example/pub/epel/|baseurl=https://mirrors.ustc.edu.cn/epel/|g' \
  -i /etc/yum.repos.d/epel{,-testing}.repo
sudo dnf makecache

[epel]
name=Extra Packages for Enterprise Linux $releasever
baseurl=https://mirrors.ustc.edu.cn/epel/$releasever/Everything/$basearch/
enabled=1
gpgcheck=1
gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-EPEL-$releasever

dnf repoinfo epel | grep -i baseurl

for file in /etc/yum.repos.d/epel{,-testing}.repo; do
  [ -f "$file" ] || continue
  [ -e "$file.bak" ] || sudo cp "$file" "$file.bak" || exit 1
done
sudo dnf install -y epel-release
sudo sed -e 's|^metalink=|#metalink=|g' \
  -e 's|^#baseurl=https://download.example/pub/epel/|baseurl=https://mirrors.bfsu.edu.cn/epel/|g' \
  -i /etc/yum.repos.d/epel{,-testing}.repo
sudo dnf makecache

[epel]
name=Extra Packages for Enterprise Linux $releasever
baseurl=https://mirrors.bfsu.edu.cn/epel/$releasever/Everything/$basearch/
enabled=1
gpgcheck=1
gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-EPEL-$releasever

dnf repoinfo epel | grep -i baseurl

for file in /etc/yum.repos.d/epel{,-testing}.repo; do
  [ -f "$file" ] || continue
  [ -e "$file.bak" ] || sudo cp "$file" "$file.bak" || exit 1
done
sudo dnf install -y epel-release
sudo sed -e 's|^metalink=|#metalink=|g' \
  -e 's|^#baseurl=https://download.example/pub/epel/|baseurl=https://mirrors.nju.edu.cn/epel/|g' \
  -i /etc/yum.repos.d/epel{,-testing}.repo
sudo dnf makecache

[epel]
name=Extra Packages for Enterprise Linux $releasever
baseurl=https://mirrors.nju.edu.cn/epel/$releasever/Everything/$basearch/
enabled=1
gpgcheck=1
gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-EPEL-$releasever

dnf repoinfo epel | grep -i baseurl