The IaaS provider offers virtualized computing resources, such as VMs, over the internet or through dedicated connections. Infrastructure as a service ( IaaS ), in which a third-party provider hosts infrastructure components, such as servers and storage, as well as a virtualization layer.These are the three most common service models: Public cloud architecture can be further categorized by service model. Cloud resources can be replicated across multiple availability zones for redundancy and protection against outages. Organizations select availability zones based on compliance and proximity to end users. The links below describe the dozens of regions and availability zones worldwide for AWS, Azure and GCP: These locations, called availability zones, typically consist of two or more connected, highly available physical data centers. Providers operate cloud services in logically isolated locations within public cloud regions. A tenant's data in the public cloud is logically separated and remains isolated from the data of other tenants. Providers have a multi-tenant architecture that enables users - or tenants - to run workloads on shared infrastructure and use the same computing resources. Public cloud architectureĪ public cloud is a fully virtualized environment that relies on high-bandwidth network connectivity to transmit data. Whichever strategy you choose, there are a range of cloud-native and third-party migration tools to help you manage the move to the public cloud. Another option is to rebuild entirely as a cloud-native application. Refactoring takes more time and planning, but this method ensures that the application will function effectively in the cloud. Alternatively, IT teams can refactor on-premises applications ahead of the migration. This approach is fast, but is prone to complications - the application may not perform properly within cloud architecture and may cost more than if it remained on premises. A lift-and-shift method moves the application to the cloud as is, without any redesign. Organizations also onboard existing on-premises applications into the cloud, and there are a few approaches to consider. Online migration is a good fit for organizations that won't move high volumes of data. When the amount of data to transfer is significant, offline migration is typically faster and less expensive. Online data migration occurs via network connection over the public internet or a cloud provider's networking service. Offline migration requires IT teams to copy local data onto a portable device and physically transfer that hardware to the cloud provider. Cost considerations, less overhead maintenance and redundancy are other common reasons.Īfter choosing a provider, the IT team must select a cloud migration method to move data into the provider's cloud. For example, some organizations require support for more diverse workload types that data centers can't provide. Myriad factors drive businesses to migrate from on-premises facilities to the public cloud. Niche providers offer more customization. General cloud providers offer broad availability and integration options and are desirable for multipurpose cloud needs. When selecting a provider, organizations can opt for a large, general-use provider - such as AWS, Microsoft Azure or Google Cloud Platform (GCP) - or a smaller provider. In the basic public cloud computing model, a third-party provider hosts scalable, on-demand IT resources and delivers them to users over a network connection, either over the public internet or a dedicated network. Public cloud is an alternative application development approach to traditional on-premises IT architectures.
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