When you launch a Linux AWS EC2 instance with Terraform or create a Linux AWS image with Packer, one of the following errors are displayed:
amazon-ebs: Error waiting for SSH: ssh: handshake failed: ssh: unable to authenticate, attempted methods [none publickey], no supported methods remain
aws_instance.default: 1 error(s) occurred:
* ssh: handshake failed: ssh: unable to authenticate, attempted methods [none publickey], no supported methods remain
Possible causes
Incorrect username
In the Packer template the “ssh_username”, in the Terraform script the “user” attribute contains the username to connect to the instance. It is important to use the correct username for each operating system. For the list of correct usernames for each operating system, see Create a server image with Packer
Wrong SSH key
Make sure you use the correct SSH key to connect to the instance. In the Terraform file, the “key_name” attribute of the “aws_instance resource” specifies the SSH key to launch the instance with, and the “private_key” attribute of the “connection” contains the key itself as a string.
I solved it by not forgetting to add the public_key_pair (of the aws account)
I had the same error message “amazon-ebs: Error waiting for SSH: ssh: handshake failed: ssh: unable to authenticate, attempted methods [none publickey], no supported methods remain” and problem was that I had forgotten to provide SSH_KEYPAIR_NAME to the dockerized Packer. After adding kaypair name, it works now!