> For the complete documentation index, see [llms.txt](https://huataihuang.gitbook.io/cloud-atlas-draft/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://huataihuang.gitbook.io/cloud-atlas-draft/service/ssh/sshd_not_load_host_key.md).

# sshd服务不能加载主机key

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](https://bbs.archlinux.org/viewtopic.php?id=165382)

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
```