Docker is an open source engine that automates application deployment. Docker uses containers, in lieu of virtual machines, to enable multiple applications to be run at once on the same server. IBM, Rackspace and Google -- along with major Linux vendors like Canonical and Red Hat -- are all onboard in their support of Docker.
Microsoft also made available in public preview form in a number of regions Azure Key Vault. Key Vault provides scalable and secure Hardware Security Module (HSM) appliances in the cloud. Key Vault lets users store cryptographic keys in Azure.