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

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?

Solution

Copying the desired public key would fall squarely into the provisioning phase. The exact answer depends on what provisioning you fancy to use (shell, Chef, Puppet etc). The most trivial would be a file provisioner for the key, something along this:

config.vm.provision "file", source: "~/.ssh/id_rsa.pub", destination: "~/.ssh/me.pub"

Well, actually you need to append to authorized_keys. Use the the shell provisioner, like so:

Vagrant.configure(2) do |config|
  # ... other config
  config.vm.provision "shell", inline: <<-SHELL
    cat /home/vagrant/.ssh/me.pub >> /home/vagrant/.ssh/authorized_keys
  SHELL
  # ... other config
end

You can also use a true provisioner, like Puppet. For example see Managing SSH Authorized Keys with Puppet.