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Commands used in Dockefile - Part4

  Docker is an opensource tool used for virtualization and deliver software in the form of packages called Containers. It is one of the most important tools used in networking domain.  Dockerfile  is a template for building the image which contains commands needed to package the software. In this post, I am going to explain the commands ADD & COPY used in  Dockerfile .   ADD Command:   ADD command is used to copy files, directories or files from remote URLS to destination path in the image. The source paths can contain wildcards.   If the destination has relative path, it is relative to the Working directory of the image. Note that source path is always relative to the Docker build context.   ADD command will not support authentication. So, if there are any protected files to be added in  Dockerfile  building, use other tools like curl or  wget   Dockerfile  copying Single & Multiple files, directory using ADD inst...
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Introduction to OpenVirtex - OpenSource Network Virtualization platform

OpenVirtex is an open source Network Virtualization Platform that gained popularity in the recent days. It allows to define the own topology and addressing along with control of OpenFlow Network (An SDN network architecture of Open Networking Foundation) through the use of programming. 
OpenVirtex is a virtualization layer that stands between the Network Operating System layer and Physical layer.
 
Functionalities of OpenVirtex:
OpenVirtex provides the following functionalities:
  • Using OpenVirtex, one can create an isolated network with their own topology
  • Can use the own Network Operating system and entire address space
  • Dynamically change the virtual network at any time
  • Easy and automatic recovery from physical failures
Supported Virtualizations by OpenVirtex:
OpenVirtex supports the following types of virtualizations:
  • Topology Virtualization: OpenVirtex maps virtual network topology to the physical network enabling topology virtualization
  • Address Space Virtualization: Virtual network has the provision to choose addressing scheme to give IP addresses to endpoints. Gives a unique tenant ID to different hosts
  • Control Function Virtualization: Maps control functions for the virtual network to the physical network
Use Case for OpenVirtex:
NFV (Network Function Virtualization): It is a technology that implements network functions like firewall, authentication in software and virtual machined instead of dedicated hardware equipment. So, NFV hast the need for managing a virtual network. Here, OpenVirtex comes into the picture to manage virtual Networks.

System Requirements for OpenVirtex:
System requirements for OpenVirtex are as below:
  • Minimum 2 cores CPU and recommended use is a CPU with 4 cores
  • Minimum 1GB Java heap size and recommended java heap size is 4GB
Pre-requisites to install OpenVirtex are as below:
  • Git and Java of version 7
  • Python with version 2.7 or higher
  • Apache Maven
  • Mongo Database to maintain persistency which is optional 
API’s of OpenVirtex:
OpenVirtex uses JSON-RPC 2.0 protocol for request and reply messages of OpenVirtex API calls. It has two types of API’s. They are:
  1. Monitoring API - Read only API to get state and configuration
  2. Tenant API - Create and configure virtual networks
All the API’s of OpenVirtex can be seen here.

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