Basis of Cloud
👉Definition
➡️On the IBM Cloud core course
Cloud computing, also referred to as “the cloud,” is the delivery of on-demand computing resources—everything from applications to data centers—over the internet on a pay-for-use.
➡️NIST(US National Institute of Standards and Technology)
a model for enabling convenient, on-demand network access to a shared pool of configurable computing resources that can be rapidly provisioned and released with minimal management effort or service provider interaction. (Examples of computing resources include networks, servers, storage, applications, and services)
👉Cloud Model
➡️Essential characteristics
- On-demand Self-service
You get access to cloud resources such as the processing power, storage, and network you need using a simple interface, without requiring human interaction with each service provider.
- Broad Network Access
It means that cloud computing resources can be accessed via the network through standard mechanisms and platforms such as mobile phones, tablets, laptops, and workstations.
- Resource Pooling
It is what gives cloud providers economies of scale, which they pass on to their customers, making cloud cost-efficient. Using a multi-tenant model, computing resources are pooled to serve multiple consumers; cloud resources are dynamically assigned and reassigned, according to demand, without customers needing to concern themselves with the physical location of these resources.
- Rapid Elasticity
implies that you can access more resources when you need them, and scale back when you don’t—because resources are elastically provisioned and released.
- Measured Service
It means that you only pay for what you use or reserve as you go; if you're not using resources, you're not paying. Resource usage is monitored, measured, and reported transparently based on utilization.
👍Advantages of Using Cloud as a service:
Cost-efficient, More agile to market change👉Types of Cloud deployment models
➡️Public
Public cloud is when you leverage cloud services over the open internet on hardware owned by the cloud provider, but its usage is shared by other companies.
➡️Private
Private cloud means that the cloud infrastructure is provisioned for exclusive use by a single organization. It could run on-premises or it could be owned, managed, and operated by a service provider.
➡️Hybrid
when you use a mix of both public and private clouds, working together seamlessly, that is classified as the Hybrid model.
👉Service models
➡️Infrastructure(IaaS)
In an Infrastructure as a Service model, you get access to infrastructure and physical computing resources such as servers, networking, storage, and data center space - without the need to manage or operate them.
➡️Platform(Paas)
In a Platform as a Service model, you get access to the platform, that is the hardware and software tools, usually those needed to develop and deploy applications to users over the Internet.
➡️Application(SaaS)
Software as a Service is a software licensing and delivery model in which software and applications are centrally hosted and licensed on a subscription basis, and sometimes also referred to as "on-demand software."
Learned on IBM Cloud Core Course.