packer-cn/vendor/github.com/pkg/sftp/examples/sftp-server/README.md

Example SFTP server implementation

In order to use this example you will need an RSA key.

On linux-like systems with openssh installed, you can use the command:

ssh-keygen -t rsa -f id_rsa

Then you will be able to run the sftp-server command in the current directory.