Ansible：无法通过 ssh 连接主机；未知密钥

Question

我在 Ansible 上连接 SSH 主机时遇到问题。错误消息是：

UNREACHABLE! => {
  "changed": false,
  "msg": "Failed to connect to the host via ssh: vdollar_percent_expand: unknown key %t\r\npercent_expand failed",
  "unreachable": true
}