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CPSC 441 (Computer Networks), Winter 2016 CPSC 441 (Computer Networks), Winter 2016

Computer Networks

Tutorial1: Rapid Access Cloud (RAC) Account and Network Setup

CPSC 441, Winter 2016

Department of Computer Science, University of Calgary


Outline !  Cloud overview

!  Setup an RAC (Rapid Access Cloud) account

!  Create an instance (Virtual Machine) in RAC

! Access your RAC

!  Exercise (Assignment 0)

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Public VM Key Name: cpsc441-‐remote Public IP: 199.116.235.169

Exercise: Create network of VMs

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RAC You Key pair: cpsc441-‐remote

1

10.2.0.173

2

4

3

5

Private VMs Key Name: cpsc441-‐local

10.2.0.174

10.2.1.122

10.2.1.124

10.2.1.123

!  Connect to the public VM (1) and thereaQer to reach the private VMs (2-‐5).

!  The public VM has two IP addresses (public and private) and two key paris (cpsc441-remote for remote access and cpsc441-loscal for accessing the private VMs.


Important to Remember !  Set up all instances in the Edmonton region !  You can only access 1 instance remotely !  Only 1 public IP is available !  All instances have a private IP !  Other instances can be accessed using private IPs once you login to the instance which has public IP

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Creating more instances (VMs) !  Example of creaXng all four instances at once is explained

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Go to “instances”


Creating more instances (VMs)

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Click “Launch Instances”

!  Launch your instances


Configure the new instance

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Step-‐A (Enter as follows): Availability zone: nova Instance Name: cpsc441_2 Flavor: m1.micro Instance Count: 4 Instance Boot Source: Boot from image Image Name: Ubuntu 14.04

Step-‐B: Click “Access & Security”

cybera-‐instance-‐3



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Click “+” to add a key pair


Configure the new instance !  Generate public/private key pair to enable access between VM with public IP and the new VM being created

!  Launch a terminal in the VM with public IP !  Do the following: !  Create ‘key’ files: ssh-‐keygen -‐t rsa -‐f cpsc441-‐local.key (You can leave the “passphrase” as empty) !  Two files will get created in the folder: a private key file “cpsc441-‐local.key” and a public key file “cpsc441-‐local.key.pub”. !  You will need these files to connect to other virtual machines (with private IPs)

!  Use “cat” command to see the content of the public key file: cat cpsc441-‐local.key.pub

!  Copy the content of this file

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Key pair name: cpsc441-‐local

Paste the content of public key here

Import the key


Access the new instances !  Connect to the public VM !  ssh –i cpsc441-‐remote.key ubuntu@<public-‐ip-‐address>

!  Connect to the private VMs: !  On the public VM, do: !  ssh –i cpsc441-‐local.key ubuntu@<private-‐ip-‐address> !  Above command enables you to login to the instance with <private-‐ip-‐address>

Note: You can get informaBon about public/private IP addresses from the RAC account page

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Ping !  It sends ICMP echo requests to network hosts

!  Typically used to check whether a host is reachable over the network

! Also provides Round Trip Time (RTT) informaXon (see sample ping result below)

12 Minimum RTT observed in milliseconds


Assignment 0 !  Use the ping tool to discover your private network of five VMs. !  According to the output of the ping tool, complete the network diagram (on slide 56) by filling out the IP addresses and the link delay between each pair of VMs.

!  You may do this manually, or simply run the scripts provided on the public VM.

!  Scripts: !  Discover – ping each of the IP addresses listed in the host-‐list file.

!  Deploy – copy the host-‐list file and the discover script to each private VM.

!  Run – remotely execute the discover script on all five VMs !  Collect – consolidate the results of the discover script (output of the ping tool) from all machines into a single file named results.txt.

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Help for Assignment - 0

Do the following steps on the public VM !  List private IP addresses of all VMs in the host-‐list file !  “host-‐list” file contains private IP addresses of all the VMs, one IP per line with no blank lines (see the provided host-‐list file for an example)

!  Run the Deploy script to upload the host-‐list file and the discover script to each private VM.

!  Run the Run script to execute the discover script on all five VMs !  Make sure that the private key file name in the script is correct (including the path)

!  Allow 3 to 4 minutes for “discover” script to complete in each instance !  Run the Collect script to consolidate the results of the discover script (output of the ping tool) from all machines into a single file named results.txt on the public VM. !  A sample consolidated result file is provided for reference

!  Print and submit results.txt and the completed network diagram

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Disclaimer: The scripts are provided to help you in compleIng the assignment. It may not be opImal. You may choose to ignore it and develop your own scripts.


Assignment 0

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RAC Your machine

1 Private IP address: ______________

Public IP address: ___________

2

IP: _____________

3

IP: _____________

4

IP: _____________

5 IP: _____________

Assignment 0

RAC Your machine

1 Private IP address: ______________

Public IP address: ___________

2

IP: _____________

3

IP: _____________

4

IP: _____________

5 IP: _____________


Questions?

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