使用Ruby中的SCP / SSH和Amazon EC2实例中的pem文件

Question

Trying to transfer or run commands remotely from an Amazon EC2(Ubuntu) instance with a Ruby script. I am not able to figure out from the ruby doc for ssh and scp how the .pem file can be passed for authentication

# download a file from a remote server
Net::SCP.download!("remote.host.com", "username",
"/remote/path", "/local/path",
:password => password)

I have also tried using command line but the issue here is the host is dynamic and I would have to authenticate 'yes' everytime

`/usr/bin/scp -i keyfile.pem -r username@some.random.ip:/remote/path /local/path`

The authenticity of host 'some.random.ip (some.random.ip)' can't be established.
ECDSA key fingerprint is some:random:fingerprint.
Are you sure you want to continue connecting (yes/no)? yes

Is there any way other than by not disabling SSH host key checking with the command line code. Or is there an option in the net-scp or the net-ssh gem for ruby?

Answer 1

Ruby solution which I did not find in any of their docs

Net::SSH.start( hostname, username, :keys => "/path/to/keyfile.pem" ) do|ssh|
    #process
end

Answer 2

try a command like this

ssh -o StrictHostKeyChecking=no -i keyfile.pem -r username@some.random.ip

You can also add the following line to your ~/.ssh/config file, to avoid using -o commandline switch

Host *
    StrictHostKeyChecking no

Note: you should probably replace * with the domain name pattern of the remote servers you access

The same should also work with scp

Answer 3

To add to what naveed stated, if you want to specify a PEM file for Net::SCP.upload! command for example use the :ssh hash key to specify the :keys hash key value:

Net::SCP.upload!("remote.host.com", "username",
  "/local/path", "/remote/path", :ssh => { :keys => "/path/to/keyfile.pem" }) do |ch, name, sent, total|
  ...
end

I figured it out from naveed's example and from looking at the documentation .