# Cloud courses Contact: [rleone@scaleway.com](mailto:rleone@scaleway.com) --- # Overview of the courses - What is the cloud? - What is the game changer? - When to use it? Not use it? - Understanding what is a IaaS compute service. Notions to understand: - Undestanding the need for capacity planning --- # Main principles - Pooled computing resources available to any subscribing users - Virtualized computing resouces to maximize hardware utilization - Elastic scale up or down according to need - Automated creation of new virtual machines or deletion of existing ones - Resouce usage billed only as used --- # Capital vs Operational Expenses (CAPEX / OPEX) ??? Capital expenses are those related to fixed assets, including both the original purchase and later improvements. IT-related examples are the costs of comput- ing equipment and software. Operational expenses are those associated with ordinary business operations. IT-related examples include salaries of technical staff, Internet costs, and subscription-based software licenses. This difference is important in business accounting and tax calculation. The value of a capital expense is spread out (and deducted) over multiple fiscal years, while the value of an operational expense is considered to be used up in the fiscal year in which the expense originated, allowing the full value to be deducted. --- # Risks - Vendor lock-in - Security & compliance - IT organizational changes - Cloud service provider maturity - Reliability and performance issues - High-profile targets - Over-scalability due to DDOS attacks / misconfigurations --- class: center, middle # Questions?