Skip to main content

What is cloud? An Overview

As per NIST, Cloud is a model for enabling convenient, on-demand network access to a shared pool of computing resources (eg: networks, servers, storage, applications and services) that can be rapidly provisioned and released with minimal management effort or service provider.
In layman terms, a cloud is a set of resources available over internet that can be used by the companies to deliver their services to all over the world. The benefits of cloud includes,
  1. On demand self service : Companies can create and start a service as you desired in least amount of time.
  2. Broad network access and availability : Services hosted in cloud is available all over the world with better availability rate.
  3. Resource pooling : Cloud companies invested a lot of money to build the resources and these resources are shared among the customers in a multi tenant model.
  4. Rapid elasticity : resources are scalable up and down in least amount of time. For example, you can set up a working windows server in a matter of few minutes.
  5. Metered service and pay as you go : Customers usually needs to pay for the resources as they use.
  6. Save on expenditure, minimize the need for IT staffs for operations and maintenance.
There are three major Cloud hosting Business model.
1) Infrastructure as a Service (Iaas)
Here the cloud provider will provide all the facilities and hardware. The customer can host their service on this. Here the Cloud provider is responsible only for the maintenance and availability of the Hardware.Client pays for these hardware usage consumption. The customer is responsible for the Operating system ,applications, and its maintenance such as patching, upgrading etc.
Companies who owns data centers invested huge amount of money for the facility, heating and ventilation, Air conditioning etc. when it comes to cloud, companies don't need to think about all those infrastructural nightmares and those things comes under the responsibility of the cloud provider like AWS, Microsoft Azure , Google etc.
2) Platform as a Service (PaaS)
Here, in addition to IaaS, PaaS adds the integration and middle-ware services. It that provides a platform allowing customers to develop, run, and manage applications without the complexity of building and maintaining the infrastructure typically associated with developing and launching an app. Eg: Google Cloud App Engine.
3) Software as a Service (SaaS)
In SaaS, the customers can use the Software application service for their use. All the hardware, OS and application will be maintained by the Cloud provider. These services are delivered over internet  seamlessly without much headache to the end customer. One great example is Salesforce.com. Most of the services such as Gmail, Outlook, Yahoo Mail, Netflix are a form of SaaS. Normally these SaaS services are billed based on a subscription plan. This eliminated mostly all risks from the customer end. 

Major Cloud players are Amazon AWS, Microsoft Azure and Google Cloud. Other companies includes Rackspace, Alibaba Cloud, Oracle cloud, IBM cloud etc.
Look forward >> The skills for your tomorrow with courses as low as $10.99

Popular posts from this blog

Cisco ASA: Disable SSLv3 and configure TLSv1.2.

For configuring TLS v1.2, the ASA should run software version 9.3(2) or later. In earlier versions of ASA, TLS 1.2 is not supported.If you are running the old version, it's time to upgrade. But before that i will show you the config prior to the change. I am running ASA version 9.6.1 Now ,set the server-version to tlsv1.2, though ASA supports version tlsv1.1, its always better to configure the connection to more secure. Server here in the sense, the ASA will be act as the server and the client will connect to the ASA.     #ssl server-version tlsv1.2 set the client-version to tlsv1.2, if required.     #ssl client-version tlsv1.2 ssl cipher command in ASA offers 5 predefined security levels and an additional custom level.     #ssl cipher tlsv1.2 high we can see the setting of each cipher levels using #show ssl cipher command. Now set the DH group to 24, which is the strongest offered as of now in the ASA.     #ssl dh-group group24 An

How to Install Netmiko on Windows?

Netmiko, developed by kirk Byers is an open source python library  based on Paramiko which simplifies SSH management to network devices and is primarily used for network automation tasks. Installing Netmiko in linux is a matter o f one single command but if you need to use Netmiko in your Windows PC, follow this process. 1) Install the latest version of Python. 2) Install Anaconda, which is an opensource distribution platform that you can install in Windows and other OS's (https://www.anaconda.com/download/) 3) From the Anaconda Shell, run “ conda install paramiko ”. 4) From the Anaconda Shell, run “ pip install scp ”. 5) Now Install the Git for Windows. (https://www.git-scm.com/downloads) . Git is required for downloading and cloning all the Netmiko library files from Github. 6) From Git Bash window, Clone Netmiko using the following command git clone https://github.com/ktbyers/netmiko&#8221         7) Once the installation is completed, ch

RUST error: linker `link.exe` not found

While compiling Rust program in a windows environment, you may encounter the error : linker `link.exe` not found. This is because of the absence of the C++ build tools in your machine. For compiling Rust programs successfully, one of the prerequisites is the installation of the Build Tools for Visual Studio 2019.   Download the Visual Studio 2019 Build tools from the Microsoft website. After the download, while installing the Build tools, make sure that you install the required components (highlighted in Yellow) This will download around 1.2GB of required files. Once everything is successfully installed, reboot and re-run your rust program and it will compile successfully.   Read More on RUST Hello World Rust Program : Code explained RUST Cargo Package Manager Explained Data Representation in Rust.

What is a Gratuitous ARP? How is it used in Network attacks?

Many of us encountered the word "Gratuitous" while exploring the network topic on ARP, The Address Resolution Protocol. Before explaining Gratuitous ARP, here is a quick review on how ARP works. ARP provides IP communication within a Layer 2 broadcast domain by mapping an IP address to a MAC address.For example, Host B wants to send information to Host A but does not have the MAC address of Host A in its ARP cache. Host B shoots a broadcast message for all hosts within the broadcast domain to obtain the MAC address associated with the IP address of Host A. All hosts within the same broadcast domain receive the ARP request, and Host A responds with its MAC address. We can see the ARP entries on our computers by entering the command arp -a . So, back to the topic on what is a Gratuitous reply, here is a better explanation. Gratuitous arp is when a device will send an ARP packet that is not a response to a request. Ideally a gratuitous ARP request is an ARP request packe

Recovery Procedure: Alcatel-Lucent Omni-Switch not booting AOS: Going to Mini-boot prompt.

Problem: Switch not booting AOS; Going to Mini-boot prompt. Model: Alcatel-Lucent OS6850 [Note:The same procedure might be applicable for different models of Omni-Switches, However, for this illustration, i have used OS-6850 ] Reason: This problem may occurs due to corrupt AOS image files or misconfigured boot parameters. Hence switch cannot boot the images properly and will go to Mini-boot prompt.  Work Around: [Note: This zmodem procedure consumes a lot to time to finish the process.] 1.) Power off your OS6850 2.) When you switched it back on, stop it before the Miniboot (there is some counter counting down from 4). Press Enter to break. 3.) You will have the following prompt " => " 4.) Enter " setenv baudrate 115200 ”. Increasing baudrate helps to increase the data transfer speed using zmodem. 5.) Enter " saveenv " 6.) Enter " boot " 7.) The switch should run now in baud rate 115200 (so you have to change your clients ter