How do I add my own public key to Vagrant VM?

Question

I got a problem with adding an ssh key to a Vagrant VM. Basically the setup that I have here works fine. Once the VMs are created, I can access them via vagrant ssh, the user "vagrant" exists and there's an ssh key for this user in the authorized_keys file.

What I'd like to do now is: to be able to connect to those VMs via ssh or use scp. So I would only need to add my public key from id_rsa.pub to the authorized_keys - just like I'd do with ssh-copy-id.

Is there a way to tell Vagrant during the setup that my public key should be included? If not (which is likely, according to my google results), is there a way to easily append my public key during the vagrant setup?

Answer 1

You can use Ruby's core File module, like so:

  config.vm.provision "shell" do |s|
    ssh_pub_key = File.readlines("#{Dir.home}/.ssh/id_rsa.pub").first.strip
    s.inline = <<-SHELL
      echo #{ssh_pub_key} >> /home/vagrant/.ssh/authorized_keys
      echo #{ssh_pub_key} >> /root/.ssh/authorized_keys
    SHELL
  end

This working example appends ~/.ssh/id_rsa.pub to the ~/.ssh/authorized_keys of both the vagrant and root user, which will allow you to use your existing SSH key.