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I have an ec2 instance which I can connect using this command with the ssh_key.pem file I have.

ssh -i ssh_key.pem ec2-user@54.174.85.61

I am trying to use ssh-copy-id to add the public key I have on my local machine to remote ec2 instance.

ssh-copy-id -i .ssh/id_ed25519.pub ec2-user@54.174.85.61

output:

/usr/bin/ssh-copy-id: INFO: Source of key(s) to be installed: ".ssh/id_ed25519.pub" /usr/bin/ssh-copy-id: INFO: attempting to log in with the new key(s), to filter out any that are already installed /usr/bin/ssh-copy-id: INFO: 1 key(s) remain to be installed -- if you are prompted now it is to install the new keys ec2-user@54.174.85.61: Permission denied (publickey,gssapi-keyex,gssapi-with-mic).

But, it is not working, I guess because I didn't provide any parameter of my private key to connect.

But, I am not able to see any such parameters in the help -h also.

Please suggest how to do so.

ssh-copy-id is not working as mentioned but I found one alternative.

I can connect to the remote machine using the pem file 3.pem

ssh -i 3.pem ec2-user@54.174.85.61

So, I tried below scp command.

scp -q -i 3.pem .ssh/id_ed25519.pub ec2-user@54.174.85.61:~/.ssh/authorized_keys

Now, this worked and I am able to login with my key generated.

ssh -i .ssh/id_ed25519 ec2-user@54.174.85.61

But, it replaces access to 3.pem, earlier key. Because it replaces all the content in the authorized_keys file as I am just copying the file and it replacing the old file.

How to make sure, only append happens.

uday kiran reddy
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2 Answers2

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Got solution, at this link: https://superuser.com/questions/1264012/how-to-ssh-copy-id-2nd-key-when-the-server-only-allows-publickey-authentication

ssh-copy-id -f -i ~/.ssh/dev_pub_key.pub -o StrictHostKeyChecking=no -o "IdentityFile ~/ssh_key.pem" $user@$server_name

Thank you all for helping on this

uday kiran reddy
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Assuming you are using publickey validation already (which from what I read you do) I would double check permission for both folders and files related to ssh public key that is ~/.ssh this should be 0700 ~/.ssh/authorized_keys this should be 0600

Va_ni_tas
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