ssh between two EC2 instances

Question

I've got two EC2 instances and I'm trying to see if I can ssh from one to another.

If I try from my Windows instance to PuTTY each of them it works( by providing the .ppk file).

Now, both instances were associated to the same key-pair and if I chekc in the .ssh/authorized_keys there is the same public key(obviously because it refers to the same Key-pair that I generated in AWS).

I tried to ssh <other host> but it asks me for a passphrase of the key which doesn't exist.

SO what I did now is to create a key-pair from instance A with ssh-keygen, then I tried

ssh-copy-id -i ~/.ssh/id_rsa.pub remote-host

but it gives me this error:

Permission denied (publickey).

Please if you have any ideas they are welcome.

Answer 1

You can't use ssh-copy-id if the only authentication method you have is publickey.

When you generated the key on the first instance, you need to copy public part from ~/.ssh/id_rsa.pub to the other instances ~/.ssh/authorized_keys.