Centos7不能yum ，下载yum源报错

报错截图

解决方案：

vim /etc/resolv.conf

nameserver 8.8.8.8 
nameserver 8.8.4.4
nameserver 223.5.5.5

重新执行成功

wget -O /etc/yum.repos.d/CentOS-Base.repo https://mirrors.aliyun.com/repo/Centos-7.repo

aarch64架构执行

wget http://mirrors.aliyun.com/repo/Centos-altarch-7.repo -O /etc/yum.repos.d/CentOS-Base.repo

进行yum install 测试

yum install -y yum-utils device-mapper-persistent-data lvm2

aarch结构yum报错

Error downloading packages:
  1:docker-ce-cli-26.1.4-1.el7.aarch64: [Errno 256] No more mirrors to try.

解决方法

配置/etc/yum.repos.d/docker-ce.repo中docker-ce-test下的enabled=0修改为1

[docker-ce-test]
name=Docker CE Test - $basearch
baseurl=https://mirrors.aliyun.com/docker-ce/linux/centos/$releasever/$basearch/test
enabled=1
gpgcheck=1
gpgkey=https://mirrors.aliyun.com/docker-ce/linux/centos/gpg