Cloud hosting runs your website or application on virtual servers drawn from a pool of physical machines, rather than on one fixed server. Because resources come from a shared pool, you can usually add CPU, memory or storage without moving to new hardware, and a setup designed for it can keep running when one machine fails. Whether you need it depends on your traffic, how much downtime you can accept and how much technical work you want to take on.<\/p>\n
In traditional hosting, your site lives on one physical server. If that server is overloaded or breaks, your site slows down or goes offline until it is fixed.<\/p>\n
Cloud hosting adds a layer of virtualisation. A hypervisor such as KVM splits physical servers into virtual machines, and the provider can place, resize or move those virtual machines across its hardware. Storage is often kept separate from the compute servers, so a virtual machine can be restarted on another host with its data intact.<\/p>\n
When a visitor opens a page, the request travels to the infrastructure hosting your site, which processes it, reads the files or database, and sends the response back. A simple cloud-hosted site may run on a single virtual server; a larger application may use separate web servers, database servers, object storage, load balancers and a content delivery network.<\/p>\n
The word “cloud” is used loosely in hosting. Some providers call any virtual private server a cloud server. Others mean a setup with automatic failover across several machines. When you compare plans, ask one question: what happens to my site if the physical server under it fails?<\/p>\n
You can usually add RAM, cores or disk space to a virtual server quickly, often with a short restart. Some platforms also let you add more servers behind a load balancer as traffic grows. This suits sites with seasonal peaks, such as a school during enrolment or a shop during a sale.<\/p>\n
When an application runs on two or more servers behind a load balancer, one can fail while the others keep serving visitors. A replica database server can keep a live copy of your data. A single cloud virtual machine on its own does not give you this; redundancy has to be built.<\/p>\n
The arithmetic shows why. A server that is up 99.9% of the time can be down for about 8.76 hours a year (0.1% of 8,760 hours). Two independent servers behind a load balancer would both need to fail at the same moment to take the site down, which is far less likely, although the load balancer and network then need protecting too.<\/p>\n
Many cloud platforms bill for the resources you allocate, so you avoid buying hardware up front and can shrink resources when demand falls. The trade-off is that costs can climb if resources are left running or traffic grows unexpectedly.<\/p>\n
Providers often run several data centres. Placing your server closer to your visitors reduces latency, the time each request takes to travel. For audiences in Zimbabwe and southern Africa, a server in Johannesburg is closer than one in Europe or North America.<\/p>\n