A cloud server or VPS (Virtual Private Server) is a fully-fledged server with its own operating system and well-defined hardware features only that unlike a classic server it shares physical resources with other virtual machines in this way more VPS can be run simultaneously on the same server (hypervisor).
This virtualization technique allows significant cost savings and an optimization of hardware resources as it is possible to run multiple operating systems on the same hardware.
Server Cloud – Pros cons
♦ Migration: It is possible to “move” (migrate) a VPS from one server (hypervisor) to another (even without interruption of service).
Example: You have created a VPS on a hypervisor in Italy and you want to move it to a server in America. With a VPS, as long as the Cloud Provider has another Datacenter in America, this can be done quickly.
♦ Scalability: It is the possibility of increasing or decreasing the hardware resources (CPU, RAM, Disk, etc) without rebuilding the VPS and in some cases without restarting it in full transparency to users who use the services provided.
Example: A VPS of 2 cores, 1 GB of RAM and 20 GB of disk has been created but after a few months we realize that the RAM memory is insufficient for the services provided and it is necessary to increase it. With a VPS it is very easy to solve this problem, just increase the RAM from the configuration panel and the new configuration will be applied (in the case of linux systems without the need to reboot).
♦ Autoscaling: It is the possibility to increase or decrease the resources (scaling) automatically according to well defined hardware policies. This technique is extremely valid in cases of load peaks.
Example: A VPS has been created with 2 cores, 1 GB of RAM and 20 GB but in some periods of the year due to the high user access these resources are not sufficient, then in this case it is possible to configure these policies:
a) If the CPU is at 90% for more than 1h then the CPU of a core increases every 30min for a maximum of 6 cores and then if the CPU is less than 10% for more than 1h decrease the CPU of a core every 30 min up to a minimum of 2 cores.
b) If the RAM is 99% for more than 1h then increase the RAM of 1Gb every 30min for a maximum of 32Gb and then if the RAM is less than 50% for more than 1h decrease the RAM of a core every 30 min until at a minimum of 1Gb.
♦ Low cost: by comparing the cost of a VPS to that of a fiscal server like hardware resources, the cost of a VPS is much lower, especially considering that some cost items are already included in the VPS fee. :
a) Energy consumption;
b) Internet band;
c) Cost of public IP addresses;
d) Costs related to housing (cooling, surveillance, etc);
f) Technical assistance.
♦ Shared resources: Depending on the configurations and characteristics of the Cloud Provider, some hardware resources, such as the CPU, could be shared so performance may be lower than a physical server. This condition is not always true as it is possible to request a 100% allocation on all hardware resources to your Cloud Provider.
Server Cloud – Limits:
- ♦ OS Virtualization: Not all operating systems and platforms can be virtualized (Eg AS400, Apple OS).
- ♦ Band: Although this is not an inherent problem of virtualization itself there could be latency differences in the Internet connection between a physical server in the company and a VPS if users are predominantly within the company and if the company has not an adequate Internet line.
Example: A physical server in the customer’s DMZ is accessed by its LAN users via a 10Gb line, if the server is virtualized and becomes a VPS at a Cloud provider, access to it is transmitted via the client’s Internet line which may be more slow.
Server Cloud – False myths:
- ♦ A VPS does not have the same performance as a physical server: By allocating 100% of the physical resources and correctly dimensioning a VPS the latter has nothing to envy to a physical server from a performance point of view.
- ♦ A VPS is less secure than a physical server: A VPS can have the same degree of security as a physical server because it is possible to adopt the same security measures (Firewall, Antivirus, Hardening, VPN) applicable to a Fiscal server.
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7 GOOD REASONS TO CHOOSE THE AUTOSCALING OPTION
1. The hard disk or one of the server’s hard disks is full
◊ WITHOUT Autoscaling: Services crash and users of applications running on the disk receive a disservice image of the company and risk users do not return.
◊ WITH Autoscaling: The disks are resized according to the new disk occupation.
2. The processor (CPU) goes into saturation (100% use)
◊ WITHOUT Autoscaling: Web applications respond slowly or time-outfollowing degradation and / or disservice to the user.
◊ WITH Autoscaling: The system adds the necessary CPUs.
3. The RAM memory goes into saturation (occupied 2Gb on 2Gb, occupied 6Gb on 6Gb …)
◊ WITHOUT: Web applications respond slowly or time-outfollowing degradation and / or disservice to the user. *
◊ WITH: The system adds RAM memory.
4. Increased network traffic (client delivers 100Mbps on a 100Mb network card)
◊ WITHOUT: What is called the “bottleneck” takes place, ie the system is not able to serve new users.
◊ CON: The system resizes the bandwidth.
5. Server oversizing
◊ WITHOUT: the user buys a client that is oversized compared to his needs as a result pays for features he does not use.
◊ CON: The system reduces resources in order to adapt to the real needs of the user, considerably reducing costs.
6. Installation times
◊ WITHOUT: In the face of a change, the user must re-install the entire platform on a larger system.
◊ CON: It is not necessary to re-install the software or the platform because the system resizes itself automatically.
7. Autoscaling vs scaling
Autoscaling does everything that a scaling system does, that is, it allows the user to vary them
hardware features, but it does this automatically, reducing management costs and increasing end-user satisfaction.
* In technical terms it is said that the operating system swapped.
Swapping means saving to the hard disk all the information that the system can not save in RAM because it is full, consequently the system slows down considerably because the access times to the disk are much higher than the available memory.
public cloud reggio emilia
Public cloud Reggio Emilia, the offer of the Public Cloud in Reggio Emilia of the Secure Online Desktop.
The Public Cloud or Public Cloud is one of the models of cloud computing, where a Service Provider (or Cloud Provider in this case) makes publicly available on the Internet resources such as applications and storage.
Public Cloud Reggio Emilia
Some of the main advantages of using a public cloud service are:
♦ A simple and economical setup as the hardware, applications and costs of the band are covered by the Cloud provider.
♦ Scalable: the public cloud service adapts to business needs by providing the possibility to increase and decrease (even automatically thanks to self-scaling) hardware resources.
♦ No waste of resources in this you only pay for what you use.
♦ No contract: The public cloud usage model implies that only the resources used will be paid when it is needed without the obligation of any contract that restricts their use.
♦ Low costs: the shared infrastructure inherent in the public cloud involves a considerable economic advantage as it is possible for the Cloud Provider to contain costs and offer its services at an advantageous price for customers.
♦ The hardare is transparent: the customer does not need to have particular hardware skills and must not make complex choices or configurations, the Cloud Provider will manage these aspects. In this way, even realities without specific skills in Information Technology can use Cloud services without dedicating internal resources.
A Gartner research shows how public cloud computing provides scalability and elasticity capabilities as a service to external customers using Internet technologies. For example, public cloud computing leverages cloud technologies to provide support to customers outside the company organization.
The use of public cloud services feeds the type of economies of sharing resources that can significantly reduce costs and increase the choice of technologies. In this way, many companies (even partners or connected to each other) can use the same services sharing the technologies and physical architectures.
The public cloud offer in Reggio Emilia of the Secure Online Desktop meets the requirements of the public cloud.
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