Determine the Operational Characteristics of the Solution Implemented
In IaaS
- It requires you to provision the VMs along with network and storage. Then deploy software and applications onto those VMs.
- Similar to traditional on-premises environment
- User still manage the individual VMs.
- gives the most control, flexibility, and portability
In PaaS
- A managed hosting environment is given
- you deploy application without needing to manage VMs or resources.
- Specify an instance count, and the service will provision, configure, and manage the necessary resources.
In FaaS
- It removes the need to worry about the hosting environment.
- Simply deploy code, and the service automatically runs it.
- Don’t need to administer the resources.
- Uses a serverless architecture
- seamlessly scale up or down to to handle the traffic.
- Provides simplicity, elastic scale, and potential cost savings
Guideline
- The more flexibility a service provides, the more you are responsible for configuring and managing the resources.
- FaaS services automatically manage all resources for running an application,
- IaaS need to be provisioned, configured and managed.
Factors for compute option
- Hosting model. How is the service hosted? What requirements and limitations are imposed by this hosting environment?
- DevOps. Is there built-in support for application upgrades? What is the deployment model?
- Scalability. How does the service handle adding or removing instances? Can it autoscale based on load and other metrics?
- Availability. What is the service SLA?
- Cost. In addition to the cost of the service itself, consider the operations cost for managing a solution built on that service. For example, IaaS solutions might have a higher operations cost.
- What are the overall limitations of each service?
- What kind of application architectures are appropriate for this service?