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| Public Cloud | IndianTechnoEra |
Public Cloud
What is Public cloud?
The cloud infrastructure is made available to the general public or a large industry group and is owned by an organization selling cloud services.
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| Public Cloud Architecture | IndianTechnoEra |
Also known as external cloud or multi-tenant cloud, this model essentially represents a cloud environment that is openly accessible.
Public Cloud is an IT model where on-demand computing services and infrastructure are managed by a third-party provider and shared with multiple organizations using the public Internet.
Public cloud service providers may offer cloud-based services such as infrastructure as a service (IaaS), platform as a service (PaaS), or software as a service (Saas) to users for either a monthly or pay-per-use fee, eliminating the need for users to host these services on site in their own data center.
Public cloud makes computing resources available to anyone for purchase. Multiple users typically share the use of a public cloud. In contrast, private cloud involves cloud-based services that are hosted within an organization’s own private servers.
The Public Cloud allows systems and services to be easily accessible to general public, e.g., Google, Amazon, Microsoft offers cloud services via Internet.
Why Public Cloud?
Many enterprise businesses look to public cloud as a way to scale existing IT resources on demand without committing to expanding their physical IT infrastructure.
For instance, instead of purchasing a physical desktop machine, a company can purchase a virtual desktop license. The virtual desktop can be spun up or deactivated in minutes and can be located anywhere, instantly.
Using the public cloud can save businesses money in a couple of different ways:
Lower equipment purchase costs.
Lower equipment maintenance costs.
Public Cloud Working
How does Public Cloud works?
A public cloud relies on a virtualized environment to provide an extension of a company’s IT infrastructure, allowing that company to host certain aspects of its infrastructure and services on virtual servers that are offsite and owned by a third party.
Public cloud service providers have different strengths, and they offer a wide variety of services and pricing models.
Companies that are considering a migration to public cloud need to carefully consider their options when it comes to choosing a provider, especially if they will be locked into a long-term contract.
Careful planning can help to keep costs down on monthly cloud services bills, but organizations with unpredictable public cloud usage may find it hard to avoid spending a lot of money on public cloud services when usage suddenly surges.
Because servers in the public cloud share data from multiple companies, security in public cloud is another issue that IT managers will want to weigh.
Encrypting data is a good way to ensure stronger security, but if you are using a combination of public and private cloud (also known as a hybrid cloud), not all encryption platforms work across both public and private clouds.
There is also an inherent security risk whenever data is moved between a private data center or private cloud and a public cloud.
One last consideration is the location of your public cloud service provider.
Data privacy laws in many countries require certain types of data to be stored in-country.
These laws change frequently, so it’s a good idea to choose a cloud service provider that is located in your country and can confirm that the servers where your data will be stored are local and in compliance with regional laws.
There is also the issue of latency—if your data is being hosted on a different continent, it may take longer than if it were stored close by.
Public Cloud Offerings
SaaS – Gmail, Microsoft 365, Dropbox, etc.
PaaS – Google App Engine etc.
IaaS – Microsoft Azure, Amazon Web Services etc.
Public Cloud Benefits
There are following advantage of public cloud;
Cost Effective
Reliability
Flexibility
Location Independence
Pay-as-you-go charging model
High Scalability
Public Cloud Drawback
There are following disadvantage of public cloud;
Low Security
Less Customizable
Public Cloud characteristics
Homogeneous infrastructure
Common policies
Shared resources and multi-tenant
Leased or rented infrastructure
Economies of scale
Public Cloud Players
AWS is the largest public cloud provider.
Azure is second largest provider in global public cloud market.
Google Cloud Platform is the third largest public cloud provider
Prominent Players in Global Public Cloud Market
AWS (US)
Microsoft (US)
Alibaba Cloud (China)
IBM (US)
Salesforce (US)
Google (US)
Oracle (US)
SAP (Germany)
Mendix (US)
Zoho Corporation (India)
Public Cloud Service Model
Public Cloud Layers
Infrastructure as a Service (IaaS)
Best Infrastructure as a Service (IaaS) Providers
Infrastructure as a service (IaaS) describes the various ways in which third-party vendors provide cloud-driven, cloud-hosted infrastructure to businesses. This infrastructure comes in a variety of forms, including (but not limited to) public clouds, virtual machines (VMs), bare metal servers, and high-performance computing (HPC). Because of the incredible diversity of IaaS tools, any organization or user within a business could find benefit from the business employing IaaS.
Companies use IaaS for a wide variety of reasons, most commonly including convenience, ease of accessibility, flexible scaling, and reduced operational expenditure (OpEx) costs. The latter two benefits are facilitated by the pay-as-you-go nature of cloud services; with IaaS, businesses only pay for what use, eliminating the large upfront costs typically associated with purchasing
IaaS Vendors
Amazon EC2
Compute Engine
Azure Virtual Machines
Virtual Machine Manager
PaaS Vendors
AWS Elastic Beanstalk
Google Cloud
IBM Cloud
Microsoft Azure Pipelines