Cloud computing is the on-demand access to computing resources—applications, servers (physical and virtual), data storage, development tools, networking capabilities, and more—hosted in a remote data centre controlled by a cloud services provider over the internet (or CSP). The CSP makes these tools available for a monthly subscription fee or charges a use fee
When compared to traditional on-premises IT, cloud computing can help with the following tasks, depending on the cloud services you choose
Public clouds
Public clouds are cloud environments typically created from IT infrastructure not owned by the end user. Some of the largest public cloud providers include Alibaba Cloud, Amazon Web Services (AWS), Google Cloud, IBM Cloud, and Microsoft Azure.
Private clouds
Private clouds are loosely defined as cloud environments solely dedicated to a single end user or group, where the environment usually runs behind that user or group's firewall. All clouds become private clouds when the underlying IT infrastructure is dedicated to a single customer with completely isolated access.
Managed private clouds
Customers create and use a private cloud that's deployed, configured, and managed by a third-party vendor. Managed private clouds are a cloud delivery option that helps enterprises with understaffed or underskilled IT teams provide better private cloud services and infrastructure
Clouds that are dedicated
Another cloud within a cloud. A dedicated cloud might be on a public cloud (for example, Red Hat OpenShift® Dedicated) or on a private cloud. An accounting department, for example, may have its own dedicated cloud within the organization's private cloud.
Cloud hybrids
A hybrid cloud is an apparent single IT environment made up of several environments linked through local area networks (LANs), wide area networks (WANs), virtual private networks (VPNs), and/or APIs.
The properties of hybrid clouds are complicated, and the criteria vary according on who you ask. A hybrid cloud, for example, may require:
There must be at least one private cloud and one public cloud.
at least two private clouds
at least two public clouds
A bare-metal or virtual environment that is linked to at least one public or private cloud.
Cloud services
Cloud services are infrastructure, platforms, or software that are hosted by third-party providers and made available to users through the internet. There are three main types of as-a-Service solutions: IaaS, PaaS, and SaaS. Each facilitates the flow of user data from front-end clients through the internet, to the cloud service provider’s systems, and back—but vary by what’s provided
IaaS
IaaS means a cloud service provider manages the infrastructure for you—the actual servers, network, virtualization, and data storage—through an internet connection. The user has access through an API or dashboard, and essentially rents the infrastructure. The user manages things like the operating system, apps, and middleware while the provider takes care of any hardware, networking, hard drives, data storage, and servers; and has the responsibility of taking care of outages, repairs, and hardware issues. This is the typical deployment model of cloud storage providers.
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Which cloud is safest?
That's a loaded question.
- Public clouds tend to have a wider variety of security threats due to multi-tenancy and numerous access points. Public clouds often split security responsibilities. For instance, infrastructural security can be the provider’s responsibility while workload security can be the tenant's responsibility.
- Private clouds are thought to be more secure because workloads usually run behind the user's firewall, but that all depends on how strong your own security is.
- Hybrid cloud security is made up of the best features of every environment, where users and admins can minimize data exposure by moving workloads and data across environments based on compliance, audit, policy, or security requirements.
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