How to add multiple keys for elastic beanstalk instance?

Question

There is a very good question on [How to] SSH to Elastic [an] Beanstalk instance, but one thing I noticed is that, through this method, it is only possible to add one SSH key.

How can I add multiple SSH keys to an instance? Is there a way to automatically add multiple keys to new instances?

Answer 1

To create a file named .ebextensions/authorized_keys.config is another way to do it.

files:   /home/ec2-user/.ssh/authorized_keys:     mode: "000400"     owner: ec2-user     group: ec2-user     content: |       ssh-rsa AAAB3N...QcGskx keyname       ssh-rsa BBRdt5...LguTtp another-key 

The name of file authorized_keys.config is arbitrary.

Answer 2

Combining rhunwicks's and rch850's answers, here's a clean way to add additional SSH keys, while preserving the one set through the AWS console:

files:   /home/ec2-user/.ssh/extra_authorized_keys:     mode: "000400"     owner: ec2-user     group: ec2-user     content: |       ssh-rsa AAAB3N...QcGskx keyname       ssh-rsa BBRdt5...LguTtp another-key commands:   01_append_keys:     cwd: /home/ec2-user/.ssh/     command: sort -u extra_authorized_keys authorized_keys -o authorized_keys   99_rm_extra_keys:     cwd: /home/ec2-user/.ssh/     command: rm extra_authorized_keys 

Note that eb ssh will work only if the private key file has the same name as the private key defined in the AWS console.