/bastion

Bastion hosts for IaaS

Bastion Hosts for IaaS

Overview

AWS

Securely connect to Linux instances running in a private Amazon VPC - 2014

Controlling Network Access to EC2 Instances Using a Bastion Server - 2013 - Windows focus

Azure

Note: Closest isn't really on target

GCE

Bastion hosts

References

OS Hardening Principles

SSH Agent Forwarding

Protect your Infrastructure Servers with Bastion Hosts and Isolated Cloud Networks

A Simple PCI AWS compliant network

Is there a better way for enterprises to allow developers access into private instances running in AWS VPCs?