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mkdir /usbkey/config.inc
然后将你的 id_rsa.pub 复制为 /usbkey/config.inc/authorized_keys
然后在 /usbkey/config 里加入下面这行:
root_authorized_keys_file=authorized_keys
然后在每次重启时,就会自动把这个文件复制到 root 的 .ssh/ 下了。