IaaS, PaaS, SaaS, serverless, containers, storage, cloud networking, reliability, security and cost control.
Cloud Service Models
IaaS gives virtual machines, disks and networks. PaaS gives a managed platform for apps. SaaS is ready-to-use software such as email, CRM or collaboration tools.
A startup might begin with SaaS tools, deploy its website on PaaS, then use IaaS for custom background workers that need full control.
Core Cloud Building Blocks
- Compute: virtual machines, containers, serverless functions and managed Kubernetes.
- Storage: object storage for files, block storage for disks and archive storage for long-term retention.
- Databases: managed SQL, NoSQL, cache and analytics databases.
- Networking: virtual networks, subnets, load balancers, private links, DNS and CDNs.
- Identity: roles, policies and access keys that control who can do what.
Real-World Architecture Example
The mobile app sends requests to an API behind a load balancer. Containers run the API. A managed database stores orders. Object storage keeps restaurant images. A queue handles receipt emails. Auto-scaling adds capacity during dinner rush and removes it at midnight.
Reliability and Disaster Recovery
Reliable cloud systems use multiple availability zones, backups, health checks, monitoring and rollback plans. The question is not "will something fail?" but "what happens when it fails?"
Cloud Security
Cloud security starts with identity. Use least privilege, multi-factor authentication, private networking, encryption at rest, encryption in transit and logging. Never hard-code access keys into code or public repositories.
Cost Control
Cloud makes it easy to create resources and forget them. Use budgets, alerts, tagging, right-sized instances, scheduled shutdowns and lifecycle rules for old files.
What to Learn Next
- Create a simple static site in object storage.
- Deploy one API behind HTTPS.
- Connect an app to a managed database.
- Build alerts for errors, latency and cost.
- Practice restoring from backup.
Cloud computing is flexible infrastructure plus managed services, rented on demand and operated with strong automation.
Explore Cloud