有两台服务器，一天安装了engine（172.21.13.30），一台安装了node（172.21.13.29）。两台服务器都关闭了selinux和firewall。
通过浏览器进入管理界面，添加29这台主机的时候，会报错。网上找到了一些解决方案，如yum clean all && yum makecache都没有效果。有没有懂得大佬可以解惑下。
报错如下：（不知道为什么图片发不出来，望谅解）
An error has occurred during installation of Host 172.21.13.29: Yum Cannot queue package dmidecode: Cannot find a valid baseurl for repo: base/7/x86_64.
An error has occurred during installation of Host 172.21.13.29: Failed to execute stage ‘Environment packages setup’: Cannot find a valid baseurl for repo: base/7/x86_64.
Host 172.21.13.29 installation failed. Command returned failure code 1 during SSH session ‘root@172.21.13.29’.