1.清除缓存
yum clean all
2.创建备份目录
mkdir /etc/yum.repos.d/bak
3.备份
mv /etc/yum.repos.d/*.repo /etc/yum.repos.d/bak
4.在 /etc/yum.repos.d/目录下创建一下三个文件
文件1：CentOS-Base.repo
# CentOS-Base.repo
#
# The mirror system uses the connecting IP address of the client and the
# update status of each mirror to pick mirrors that are updated to and
# geographically close to the client. You should use this for CentOS updates
# unless you are manually picking other mirrors.
#
# If the mirrorlist= does not work for you, as a fall back you can try the
# remarked out baseurl= line instead.
#
#
[base]
name=CentOS-7 - Base - mirrors.aliyun.com
failovermethod=priority
baseurl=http://mirrors.ustc.edu.cn/centos-altarch/7/os/$basearch/
#baseurl=http://mirrors.aliyun.com/centos/7/os/$basearch/
gpgcheck=1
enabled=1
#gpgkey=http://mirrors.aliyun.com/centos/RPM-GPG-KEY-CentOS-7
gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-CentOS-7
file:///etc/pki/rpm-gpg/RPM-GPG-KEY-CentOS-SIG-AltArch-Arm32
#released updates
[updates]
#name=CentOS-7 - Updates - mirrors.aliyun.com
#failovermethod=priority
#baseurl=http://mirrors.aliyun.com/centos/7/updates/$basearch/
#gpgcheck=1
#gpgkey=http://mirrors.aliyun.com/centos/RPM-GPG-KEY-CentOS-7
name=CentOS-$releasever - Updates
# mirrorlist=http://mirrorlist.centos.org/?release=$releasever&arch=$basearch&repo=updates
baseurl=http://mirrors.ustc.edu.cn/centos-altarch/$releasever/updates/$basearch/
gpgcheck=1
enabled=1
gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-CentOS-7
file:///etc/pki/rpm-gpg/RPM-GPG-KEY-CentOS-SIG-AltArch-Arm32
#additional packages that may be useful
[extras]
#name=CentOS-7 - Extras - mirrors.aliyun.com
#failovermethod=priority
#baseurl=http://mirrors.aliyun.com/centos/7/extras/$basearch/
#gpgcheck=1
#gpgkey=http://mirrors.aliyun.com/centos/RPM-GPG-KEY-CentOS-7
#additional packages that extend functionality of existing packages
name=CentOS-$releasever - Extras
# mirrorlist=http://mirrorlist.centos.org/?release=$releasever&arch=$basearch&repo=extras
baseurl=http://mirrors.ustc.edu.cn/centos-altarch/$releasever/extras/$basearch/
gpgcheck=1
enabled=1
gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-CentOS-7
file:///etc/pki/rpm-gpg/RPM-GPG-KEY-CentOS-SIG-AltArch-Arm32
[centosplus]
#name=CentOS-7 - Plus - mirrors.aliyun.com
#failovermethod=priority
#baseurl=http://mirrors.aliyun.com/centos/7/centosplus/$basearch/
#gpgcheck=1
#enabled=0
#gpgkey=http://mirrors.aliyun.com/centos/RPM-GPG-KEY-CentOS-7
name=CentOS-$releasever - Plus
# mirrorlist=http://mirrorlist.centos.org/?release=$releasever&arch=$basearch&repo=centosplus
baseurl=http://mirrors.ustc.edu.cn/centos-altarch/$releasever/centosplus/$basearch/
gpgcheck=1
enabled=0
gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-CentOS-7
file:///etc/pki/rpm-gpg/RPM-GPG-KEY-CentOS-SIG-AltArch-Arm32
#contrib - packages by Centos Users
#[contrib]
#name=CentOS-7 - Contrib - mirrors.aliyun.com
#failovermethod=priority
#baseurl=http://mirrors.aliyun.com/centos/7/contrib/$basearch/
#gpgcheck=1
#enabled=0
#gpgkey=http://mirrors.aliyun.com/centos/RPM-GPG-KEY-CentOS-7
文件2：ceph.repo
[ceph]
name=ceph
baseurl=http://mirrors.163.com/ceph/rpm-jewel/el7/aarch64/
gpgcheck=0
[ceph-noarch]
name=cephnoarch
baseurl=http://mirrors.163.com/ceph/rpm-jewel/el7/noarch/
gpgcheck=0
文件3：epel.repo
[epel]
name=Extra Packages for Enterprise Linux 7 - $basearch
baseurl=http://mirrors.aliyun.com/epel/7/$basearch
failovermethod=priority
enabled=1
gpgcheck=0
gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-EPEL-7
[epel-debuginfo]
name=Extra Packages for Enterprise Linux 7 - $basearch - Debug
baseurl=http://mirrors.aliyun.com/epel/7/$basearch/debug
failovermethod=priority
enabled=0
gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-EPEL-7
gpgcheck=0
[epel-source]
name=Extra Packages for Enterprise Linux 7 - $basearch - Source
baseurl=http://mirrors.aliyun.com/epel/7/SRPMS
failovermethod=priority
enabled=0
gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-EPEL-7
gpgcheck=0
5.建立缓存
yum makecache
6.成功
