John Calvert discusses the differences between on-premise/enterprise clouds and public clouds. On-premise clouds have higher SLAs but coarser scaling, while public clouds have lower SLAs but finer-grained scaling. On-premise uses more expensive hardware and homogeneous software with tighter coupling, whereas public clouds use commodity hardware and more heterogeneous, decoupled software and services following a "cattle, not pets" approach. He provides links to resources on cloud maturity levels, Azure pricing, and web application firewall rule sets.

1. John Calvert
Chief Architect
Software Craft

4. Cloud Host
Virtualization Host
Virtual Machine
SQL
Data
Filesys
Docs
App &
Repo
ISAPI
Web
Server
OS
Virtual Machine
SQL
Data
Filesys
Docs
OS
AppISAPI
Web
Server
Sec &
Mon
Virtual
Machine
Virtual
Machine
Other
Mgmt
Svcs
Repo

6. On Prem / Enterprise Cloud
SLAs 99.99… One or two less “9”s
Scaling Discrete / Corse Near Continuous / Fine
Vertical / Horizontal Horizontal
Hardware Enterprise Commodity
Software More homogeneous More heterogeneous
More coupled More decoupled
ALM / SDLC Waterfall => Agile DevSecOps

8. cattle not pets

11. Azure Price Calculator

21. http://cloudscaling.com/blog/cloud-computing/the-history-of-
pets-vs-cattle/
https://www.itopstimes.com/cloud/4-levels-cloud-maturity/
https://azure.microsoft.com/en-ca/pricing/calculator/
https://www.owasp.org/index.php/Category:OWASP_ModSecurity
_Core_Rule_Set_Project
https://modsecurity.org/crs/