🔐 Shared Responsibility Model in Cloud Computing

🔐Shared Responsibility Model in Cloud Computing

The Shared Responsibility Model explains how security and management responsibilities are divided between the customer and the cloud provider, depending on the service model.

As you move from On-Premises → IaaS → PaaS → SaaS, customer responsibility decreases while cloud provider responsibility increases.

In an on-premises setup:

👉 Everything is the customer’s responsibility, either managed directly or via a third-party vendor.

Customer manages:

• Data
• Devices
• Accounts & identities
• Applications
• Network controls
• Operating system
• Physical servers (hosts)
• Physical network
• Physical data center
• Security infrastructure

✔️Maximum control, maximum responsibility

☁️IaaS – Infrastructure as a Service

In IaaS, the cloud provider handles the physical infrastructure, but the customer still manages most software-related components.

Cloud Provider manages:

• Physical data center
• Physical network
• Physical servers (hosts)
• Customer manages:
• Operating system
• Applications
• Data
• Network controls
• Devices
• Accounts & identities

✔️Ideal for full OS control and lift-and-shift migrations

⚙️PaaS – Platform as a Service

In PaaS, responsibility is more balanced.

• Cloud Provider manages:
• Physical infrastructure
• Operating system
• Runtime environment
• Middleware
• Patching & backups

Shared responsibility:

• Identity and directory infrastructure
• Security configurations
• Customer manages:
• Applications
• Data
• User access
• Application-level network controls

✔️ Best for developers who don’t want OS or infra management

🖥️SaaS – Software as a Service

In SaaS, the cloud provider manages almost everything.

Cloud Provider manages:

• Application
• Operating system
• Network controls
• Security infrastructure
• Physical infrastructure
• Updates & maintenance
• Shared responsibility:
• Identity and directory infrastructure

Customer manages:

• Data
• End-user devices
• Accounts & identities

✅Final Takeaway

The more you move toward SaaS, the less you manage—and the more the cloud provider manages for you.
Choose IaaS → when you want control
Choose PaaS → when you want balance
Choose SaaS → when you want simplicity

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