Error: Failed to download metadata for repo ‘AppStream‘Failed to download metadata for repo ‘AppS...

通过yum install -y httpd安装 httpd 时，出现了错误提示信息：

Failed to download metadata for repo 'AppStream'
Error: Failed to download metadata for repo 'AppStream'

解决方法：

1、进入到 yum 的 repos 目录

cd /etc/yum.repos.d/

2、修改 centos 文件内容

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-*

3、生成缓存更新（第一次更新，速度稍微有点慢，耐心等待两分钟左右）

yum makecache

4、运行 yum install -y httpd

yum install -y httpd

至此，问题成功解决！

• 查看httpd状态

systemctl status httpd.service

• 开启httpd

sudo service httpd start