docker - 如何修复 : yum install with error in docker container?

Question

我只是想尝试在 centos:latest image 中安装 sshd。

我尝试安装“passwd”，键入如下命令:

yum 安装密码

但是我有这样的错误:

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]

不知道为什么不能在docker容器中使用yum安装？

Answer 1

伪装允许 docker 入口和导出:

    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

重启 docker :

     systemctl restart docker