I've got another Tripwire State of Security blog up: https://www.tripwire.com/state-of-security/private-public-cloud-security-challenges

When you need to add a new security function to your private cloud, the main challenge in most cases is how quickly you can deploy the toolset. This, in turn, ensures that you can increase your security coverage quickly and easily.

The cloud equation, whilst mature at this stage, remains one that requires us to juggle private and public with varied approaches required IMHO