Lately I have been involved in a team which is developing software as micro-services. It is very interesting work and has helped me to get introduced to some interesting technologies such as AWS Ansible and Docker in depth (and in practice). Ansible is a great deployment automation tool. It is made in python, is declarative and agent-less (i.e. it just needs SSH access to your box). SSH it self is very secure if you use key based authentication. But people tend to use it in very insecure manner (i.e they share SSH keys on email, don't delete old SSH keys once they are revoked etc). In my opinion the best solution to stop sharing of private keys is to generate them on a hardware token from which they cannot be (easily) copied. Fortunately I have access to Yubico Neo on which I managed to generate a public/private gpg key. The private key resides in your gpg card and public key can be put in your Ansible target hosts. There are quite a few guides ( Mac , Linux , Windows)
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