通过virt-clone复制出ubuntu 16的kvm虚拟机,并且使用了virt-sysrep工具初始化clone出来的虚拟机。

但是发现clone后虚拟机虽然启动sshd,准备运城登录却发现服务器端每次ssh连接立即断开,从服务器systemctl status sshd可以看到如下报错:

error: Could not load host key: /etc/ssh/ssh_host_ed25519_key
fatal: No supported key exchange algorithms [preauth]
...

参考 [SOLVED] SSH: Could not load host key: /etc/ssh/ssh_host_rsa_key

执行如下命令创建主机ssh key:

/usr/bin/ssh-keygen -A

然后重新加载sshd

systemctl reload sshd

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