开发者眼中的 IaaS、PaaS 和 SaaS

Question

Before any one plans to mark this question as duplicate please go through the question completly
I am hearing these 3 words from quite some time now and finally beginning to get a chance to work on on of these. But I would like some clarification on some basics, if you all can help me out. I would like to clarify my understanding by example, please mark if its correct and please answer the query thereafter
Understanding:
1) IaaS: Looking from point of view of developer
I have developed my application in any language. I don't/can't buy hardware(physical machine). But I have all the required softwares like OS,server(tomcat/WAS etc). I go with this solution and pay only for physical infrastructure.
2) PaaS: Looking from point of view of developer
I have developed my application in any language. I don't/can't but any thing other than that. I go with this solution. The service provider gives me all the physical and virtual/software things
3) SaaS: What is SaaS from point of view of develper??
I am unable to understand what is SaaS from a developers point of view. What is the role of developer in SaaS?
Please confirm if my understanding about IaaS, PaaS are correct or not and there after please explain in this example fashion what would SaaS be like?

Answer 1

Saas is to facilitate to the end users. As a developer, you don't need to develop the application. Software as a service model will provide application to you. You just need to log in and start working and customizing it. Like Gmail is an example of it. If you need some application to send an email in your company, you don't need to develop the application yourself. Just use the Gmail services. In you scenario, you already have application developed, so you don't need to use Saas but you should go for Paas or Iaas.

Answer 2

1. Saas: Application is deployed and running fine (high-availability and everything already configured). There is no 'green field' development but only maintenance work (brownfield).
2. Paas: Machine is ready, required OS is running, required runtime (.Net framework), required DB (SQL Azure) is ready to create DB. Availability of the application is already configured or can easily be configured. The developer can start developing and deploying(their main resposibility).
3. Iaas: Machine is ready, OS is ready, need to install runtime, need to install SQL server, design high availability. In addition to this they need to do application development and deploy.

Answer 3

Iam sharing my experiences along with Standard definitions by NIST. Iam developer from product company and we own database and client (eco system). We partner with cloud providers (technology partner) to sell our products via marketplace.

Typically we deliver images (ami,vhd,etc) + some (cloud formation templates or ARM templates, etc) in case of PaaS. We have Jenkins pipelines to place them in market place (version based). Here with some skills developers can login into instances and manipulate the software (eg after database instances are launched login and completely remove the software and make it look like just EC2 instances)

In case of SaaS our Jenkins pipelines will directly deploy (whether they are web apps, azure/lambda functions). Neither developers/end users have less control over the physical hardware.

Below are the Actors defined by NIST and since developers(tech company that provides software) partners with cloud provider, developers best match is cloud provider.

Answer 4

Saas is a major facility for users to overcome the hurdles of configurations, hardware, and other technical or complex tasks. Paas is good for someone who wants to manage 1st two layers of the OSI model. Iaas provides you with an infra structure ready templete to work on the upper layers of the OSI Model.