如何修复：docker容器中出现错误的yum安装？

我只是想尝试在centos中安装sshd：最新映像

我尝试安装“passwd”，键入如下命令：

Failed to set locale, defaulting to C.UTF-8
CentOS-8 - AppStream                            0.0  B/s |   0  B     00:30    
Errors during downloading metadata for repository 'AppStream':
  - Curl error (6): Couldn't resolve host name for http://mirrorlist.centos.org/?release=8&arch=x86_64&repo=AppStream&infra=container [Could not resolve host: mirrorlist.centos.org]
Error: Failed to download metadata for repo 'AppStream': Cannot prepare internal mirrorlist: Curl error (6): Couldn't resolve host name for http://mirrorlist.centos.org/?release=8&arch=x86_64&repo=AppStream&infra=container [Could not resolve host: mirrorlist.centos.org]

yum安装passwd

但我有这样一个错误：

Failed to set locale, defaulting to C.UTF-8
CentOS-8 - AppStream                            0.0  B/s |   0  B     00:30    
Errors during downloading metadata for repository 'AppStream':
  - Curl error (6): Couldn't resolve host name for http://mirrorlist.centos.org/?release=8&arch=x86_64&repo=AppStream&infra=container [Could not resolve host: mirrorlist.centos.org]
Error: Failed to download metadata for repo 'AppStream': Cannot prepare internal mirrorlist: Curl error (6): Couldn't resolve host name for http://mirrorlist.centos.org/?release=8&arch=x86_64&repo=AppStream&infra=container [Could not resolve host: mirrorlist.centos.org]

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我不知道为什么不能在docker容器中使用yum进行安装？

刚刚在我的本地计算机上测试了这一点：

docker run-it-d——名称测试centos:latest；
docker exec-it测试/bin/bash；

在docker容器中：

[root@f3b8b3fe70df/]#yum update-y；
[root@f3b8b3fe70df/]#yum安装passwd；

使用

网络主机添加对主机网络的访问

docker run --network host -it -d --name test centos:latest

伪装允许码头工人进出：

    firewall-cmd --zone=public --add-masquerade --permanent

特别允许端口80/443上的传入流量：

     firewall-cmd --zone=public --add-port=443/tcp

重新加载防火墙以应用永久规则：

     firewall-cmd --reload

重新启动docker：

     systemctl restart docker

你之前做了
yum更新
？@codingwithmanny是的，我做了。但同样的错误，很奇怪。Docker版本和运行它的操作系统是什么？Docker版本19.03.10，操作系统linux CentOS 8