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Introduction to OpenStack
 OpenStack is an open source platform, which offers powerful virtual 
servers and required services for cloud computing. It is mostly deployed 
as Infrastructure-as-a-service (IaaS), which aims to provide hardware 
tools and components for processing, storage, and networking resources 
throughout a data center.
 OpenStack can be understood as a software platform that uses pooled 
virtual resources to build and manage clouds, both public and private 
ones.
 OpenStack offers a couple of cloud-related services like networking, 
storage, image services, identity, etc., and can be clubbed with a few 
more to get a customized cloud optimization to support the cloud-native 
apps.
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Why OpenStack?
 OpenStack is most importantly an open source environment that gives 
complete control over the cloud computation. Most of the platforms 
available in the market, which helps in virtualization and cloud 
computation, are all expensive and licensed.
 OpenStack can be installed free of cost and can be customized with the 
required services to suit the need. Hence many corporations own their 
own version of OpenStack.
 Moreover, it can be scaled to any extent possible, making the jobs of the 
server admins easier.
 The OpenStack API is made robust and more flexible with improvements 
contributed by many developers across the world. This also ensures good 
community support.
 Many big shot companies in the IT world like Huawei, Intel, Red Hat 
have adopted OpenStack on their cloud management.
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OpenStack Architecture 
Compute (Nova)
  Compute is one of the most important and mandatory components of OpenStack. It 
is basically a virtualization hypervisor. In a cloud computing environment, it acts as 
a controller, which manages all the resources in a virtual environment. It is also 
used to manage the high-performance bare metal configurations.
  It is coded in Python and has utilized many pre-defined libraries to deliver robust 
functioning. The hypervisor technologies that might be used are Xen, KVM, and 
VMware and this selection, depends on the version of OpenStack used. SQL is used 
for database
 access.
Logical Architecture
 Logical architecture, besides the basic structural architecture, is essential to design, 
deploy and configure OpenStack.
 OpenStack is made of all distinct Services. Each of these services is internally 
configured to have one API service. Each API service is always looking for API 
requests and these requests when obtained are preprocessed and passed on to the other 
parts of the service.
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 Advantage of using OpenStack 
 The average cost and complexity of supporting a generic infrastructure are low by 
definition, than supporting a large diversity of infrastructures which don't share a 
common ground.
 As many big shot companies and independent developers are constantly 
contributing to make OpenStack a better environment, it is more reliable to switch 
to, than those of independent vendors.
 When talking about a company, managing both private and public clouds 
separately costs heavily in terms of the labor, infrastructure investment, 
customizing capacity of the specific infrastructure along with the added risk. 
OpenStack, on the other hand, has grown to support private and public clouds 
more efficiently than any other competitor in the market. Moreover, it is always 
easier to manage one single environment than two different ones.
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Hardware requirement
 Controller
 The controller node mainly runs the following functionalities:
 Image Service
 Identity Service
 Management portions of :
 Compute
 Networking
 Various networking agents
 Dashboard
 Supporting services like SQL Database, message queue, NTP. etc
 
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How does OpenStack work?
  Cloud mainly provides computing for the end users in a remote environment, where 
they deploy the software programs and run them, instead of a physical environment 
that has more limitation in terms of capabilities and storage. OpenStack is 
considered as an Infrastructure as a Service (IaaS), where it helps the users to easily 
add a new instance on which the cloud components can run. Basically, the 
infrastructure aims to provide a "platform" on which the developer can create and 
deploy software applications.
   Horizon is the face of the application environment. Everything a user needs to do 
should start with the Dashboard, which is called Horizon. It is a simple graphical 
user interface which has the divided modules that perform a specific action.
  As we know, every action on OpenStack works as a service API call. Every API 
call is first authenticated by Keystone for the permission availability. So, before you 
access the dashboard of OpenStack, you will have to authenticate yourself as a 
registered user, through your login credentials.
   The image instances are basically the instances of your virtual machines or 
environments on which you will configure the cloud. They can be Ubuntu, CirrOS, 
RedHat, OpenSUSE, etc.  
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