If you have ssh with keys for authentication setup on your system, and you use vagrant then you can combine the two to have all your ssh keys automatically shared with your vagrant machine
vim ~/.ssh/config
Host 192.168.x.x
ForwardAgent yesInside your vagrant file, add the line:
config.ssh.forward_agent = trueThen, inside your host machine, run
ssh-addto start the ssh agent on your host machine.
Then run ssh-add on the vagrant box.
You can even automate the ssh-add on your provisioning scripts with the following:
echo "ssh-add" >> /home/vagrant/.bash_profileThis way, every time you vagrant up your machine will be ready to ssh into any system you have configured in your host without the need for passwords (think deploying to staging servers)