How to Implement Cloud Computing in ns2

To implement the cloud computing in Network Simulator 2 (ns2), we have to simulate a network in which the several clients communicate with servers hosted in a data center. This configuration can be used to prototype a different cloud computing situations like distributed computing, data storage and application hosting. Below, we aggregate some instructions to help you establish this in ns2:

Step-by-Step Implementation:

Conceptual Overview

In a cloud computing network simulation:

  1. Data Center Nodes (Cloud Servers): These nodes indicate cloud servers that host applications, data, or services.
  2. Client Nodes: These nodes denote users or applications that utilize the cloud services across the network.
  3. Network Infrastructure: The network infrastructure links the clients to the cloud servers, mainly has routers and switches.

Step 1: Conceptualize the Cloud Computing Network Simulation

In this simulation, we will generate an environment that has several client nodes send requests to cloud servers hosted in a data center. The servers process these requests and send replies back to the clients.

Step 2: Create the Tcl Script

Simulates a basic cloud computing network scenario in ns2 by using an example Tcl script.

Example Tcl Script for Simulating Cloud Computing in ns2

# Create a simulator object

set ns [new Simulator]

# Define the topography object (for a moderate area)

set topo [new Topography]

$topo load_flatgrid 1000 1000  # 1km x 1km area

# Create the General Operations Director (GOD) for wireless simulations

create-god 7  # Number of nodes (5 clients + 2 cloud servers)

# Configure the nodes for the cloud computing network

$ns node-config -llType LL \

-macType Mac/802_11 \

-ifqType Queue/DropTail/PriQueue \

-ifqLen 50 \

-antType Antenna/OmniAntenna \

-propType Propagation/TwoRayGround \

-phyType Phy/WirelessPhy \

-channelType Channel/WirelessChannel \

-topoInstance $topo \

-agentTrace ON \

-routerTrace ON \

-macTrace ON \

-movementTrace OFF

# Open trace and NAM files for recording the simulation

set tracefile [open cloud_out.tr w]

$ns trace-all $tracefile

set namfile [open cloud_out.nam w]

$ns namtrace-all-wireless $namfile 1000 1000

# Define a finish procedure to close files and end the simulation

proc finish {} {

global ns tracefile namfile

$ns flush-trace

close $tracefile

close $namfile

exec nam cloud_out.nam &

exit 0

}

# Create cloud server nodes (representing the data center)

set server1 [$ns node]

set server2 [$ns node]

# Create client nodes

set client1 [$ns node]

set client2 [$ns node]

set client3 [$ns node]

set client4 [$ns node]

set client5 [$ns node]

# Set initial positions for cloud servers and clients

$server1 set X_ 500.0

$server1 set Y_ 800.0

$server1 set Z_ 0.0

$server2 set X_ 600.0

$server2 set Y_ 800.0

$server2 set Z_ 0.0

$client1 set X_ 200.0

$client1 set Y_ 200.0

$client1 set Z_ 0.0

$client2 set X_ 300.0

$client2 set Y_ 300.0

$client2 set Z_ 0.0

$client3 set X_ 400.0

$client3 set Y_ 400.0

$client3 set Z_ 0.0

$client4 set X_ 500.0

$client4 set Y_ 500.0

$client4 set Z_ 0.0

$client5 set X_ 600.0

$client5 set Y_ 600.0

$client5 set Z_ 0.0

# Define a custom procedure for simulating cloud service requests

proc send_request {src dst packetSize rate} {

global ns

# Create a TCP agent to simulate cloud requests

set tcp [new Agent/TCP]

$ns attach-agent $src $tcp

set sink [new Agent/TCPSink]

$ns attach-agent $dst $sink

$ns connect $tcp $sink

# Generate cloud service request traffic using an FTP application

set ftp [new Application/FTP]

$ftp attach-agent $tcp

$ftp start

}

# Simulate cloud service requests from clients to servers

$ns at 1.0 “send_request $client1 $server1 1024 100Kb”

$ns at 2.0 “send_request $client2 $server2 1024 100Kb”

$ns at 3.0 “send_request $client3 $server1 1024 100Kb”

$ns at 4.0 “send_request $client4 $server2 1024 100Kb”

$ns at 5.0 “send_request $client5 $server1 1024 100Kb”

# Schedule the end of the simulation

$ns at 20.0 “finish”

# Run the simulation

$ns run

Step 3: Run the Tcl Script

Save the script with a .tcl extension, for example, cloud_simulation.tcl. Then, execute the script using the below command in your terminal:

ns cloud_simulation.tcl

Step 4: Visualize the Simulation

To visualize the simulation, open the generated NAM file using:

nam cloud_out.nam

Script Explanation

  • Cloud Servers: The nodes server1 and server2 denotes the cloud servers placed in the data center. These nodes manage requirements from clients.
  • Client Nodes: The nodes client1 to client5 indicates users or applications that send demands to the cloud servers to access services.
  • Service Requests: The send_request procedure simulates clients sending requirements to the servers using TCP, which is usual for constant data transfer in cloud environments.
  • FTP Traffic: The FTP application simulates file transfer requests, indicating cloud service communications.

Customization

  • Different Traffic Types: Text with other kinds of traffic (like HTTP, CBR) to mimic various cloud applications.
  • Varying Data Rates: Modify the data rates and packet sizes to recreate multiple load conditions on the cloud servers.
  • Load Balancing: Execute load balancing by dynamically routing client requests to numerous servers as per their load.
  • Security: Attach security mechanisms like encryption to replicate secure communication amongst clients and servers.

Limitations

  • Simplified Cloud Model: It offers a simple model of cloud computing which does not responsible for the full difficulties of realistic cloud environments like virtualization, multi-tenancy, or dynamic resource allocation.
  • No Physical Layer Simulation: It does not simulate the physical layer characteristics especially to cloud scenario like data center network architecture or inter-cloud connectivity.
  • Limited Protocol Support: ns2 is not developed for advanced cloud protocols, so the simulation is restricted to estimating cloud interactions using available network models.

In conclusion, we will walk you through the entire details on how to setting up and simulating cloud computing in the ns2 (Network Simulator) tool. If you need any additional information of cloud computing, we can guide you through another relevant manual.

Share your research details with us, and we will present you with cutting-edge Cloud Computing projects, complete with implementation results. At ns2project.com, we provide exceptional research outcomes, including comprehensive comparative analyses tailored to your projects. Our skilled developers specialize in various cloud computing scenarios, such as distributed computing, data storage, application hosting, and beyond.