Hadoop Tutorial 4: Start an EC2 Instance

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--D. Thiebaut 16:01, 18 April 2010 (UTC)

Creating an EC2 Instance refers to the action of starting a server on Amazon using one's credential, and then connecting to it using ssh.


Method #1: Using the AWS Console


The steps are fairly simple:

Launch instance from AWS console

  • Connect to the AWS console (see Tutorial 3 for a reminder), and then select Amazon EC2.
  • In the QuickStart tab, pick "Fedora LAMP Server", as a machine to instantiate.
  • Select 1 instance, pick the architecture of your choice, and No Preference for the zone.
  • Select Launch Instance (Spot Instances are low-rate machines that run only when the demand is low, and the user pays less).
  • Click on Continue (make sure your browser window is large enough to see the bottom part of the pop-up!)

AWS StartNewEC2Instance.png

  • Use defaults for Kernel Id and RamDisk Id.
  • No Monitoring
  • Click on Continue

AWS CreateKeyPairForEC2.png

  • Pick a name for your key-pair file (e.g. dftKeyPair), then click on Create New Key Pair.
  • When prompted, save the key-pair file (dftKeyPair.pem) to a local directory on your computer (Desktop, for example).
  • Follow the directions to create a security group (I called it dftGroup for simplicity).

AWS SecurityGroupForEC2.png

  • Review!
AWS ReviewEC2Instance.png

  • Launch!
  • Watch as the instance is created, and loads up...

AWS watchingInstanceLaunch.png

  • When the instance is created, right click on it and click on Connect


Connecting using SSH

  • First create a working directory on your local computer (I'll assume you are using a Mac or a Linux box. Similar steps are easy to take for Windows)
  • Start a Terminal window
  • create a new working directory and copy the Key-Pair file into it:
 cd /
 mkdir aws
 cd aws
 cp  ~/Desktop/dftKeyPair.pem .
 chmod go-r dftKeyPair.pem
 ls -l 
 total 8
 -rw-------@ 1 thiebaut  wheel  1693 Apr 22 08:25 dftKeyPair.pem
  • Copy/Paste the ssh command into a shell that you will have started
 ssh -i dftKeyPair.pem root@ec2-75-101-234-143.compute-1.amazonaws.com 
  • You should be connected!
  ssh -i dftKeyPair.pem root@ec2-75-101-234-143.compute-1.amazonaws.com 
  The authenticity of host 'ec2-75-101-234-143.compute-1.amazonaws.com...
  RSA key fingerprint is cd:79:eb:e5:e9:2e:d6:a2:9c:...
  Are you sure you want to continue connecting (yes/no)? yes 
  Warning: Permanently added 'ec2-75-101-234-143.compute-1.amazonaws.com,7...

        __|  __|_  )  Fedora 8
        _|  (     /    32-bit

  Welcome to an EC2 Public Image


--[ see /etc/ec2/release-notes ]--

 [root@ip-10-244-181-219 ~]# 
  • You are now root of a machine on Amazon's cloud. Play with it!
  • Check that the mysql server is working:
  [root@ip-10-244-181-219 ~]# mysql
  Welcome to the MySQL monitor.  Commands end with ; or \g.
  Your MySQL connection id is 2
  Server version: 5.0.45 Source distribution

  Type 'help;' or '\h' for help. Type '\c' to clear the buffer.

  mysql> show databases;
  | Database           |
  | information_schema | 
  | mysql              | 
  | test               | 
  3 rows in set (0.00 sec)
  mysql> quit
  • Add a new user
 [root@ip-10-244-181-219 ~]# adduser thiebaut
 [root@ip-10-244-181-219 ~]# ls /home
 thiebaut  webuser
 [root@ip-10-244-181-219 ~]#

Installing Software

  • Try editing a file with emacs...
  • Oops, emacs is not installed on the EC2 Instance. No big deal, we can install it. The installation package under Fedora is called yum:
   yum -y install emacs
  • Now try editing with emacs...  :-)

Lab Experiment #1
Run the multiprocessing version of the NQueens program on your new Instance and compare its execution time to the best time obtained so far.
The multiprocessing version of the N-Queens program is available here. An easy way to time the execution of multiple runs would be:
for i in {15..21} ; do echo -n $i
/usr/bin/time python2.6 multiprocessingNQueens.py $i 2>&1 | grep real
You will discover that the multiprocessing python module runs only with Python 2.6! So you'll have to install it before running the program. The steps are simple:
  • install gcc first
  • download the source code for Python2.6
  • untar it into a directory
  • compile it
  • install it
These steps are shown below
yum -y install gcc
wget http://www.python.org/ftp/python/2.6.5/Python-2.6.5.tgz
tar -xzvf Python-2.6.5.tgz
cd Python-2.6.5
make install
You should have python 2.6 available to you. To invoke it, simply use python2.6 at the command line.

Method #2: Using the EC2 Tools


  • Download the EC2 Tools from the Amazon EC2 Resource Center.
  • install them in ~/bin/ec2-api-tools (see the Getting Started Guide from Amazon for more info).
  • Download the pem files containing your private key and certificate from the Amazon EC2 page (see step above)
  • Modify your .bash_profile file and set several variables:


# Amazon AWS/EC2 tools 
export EC2_HOME=/Users/thiebaut/bin/ec2-api-tools
export JAVA_HOME=/System/Library/Frameworks/JavaVM.framework/Home
export EC2_CERT=~/.ssh/cert-WMW2M4ZVFMCZJXSXJN4D7ZS4RMTBJ7VV.pem
  • Source the .bash_profile file
source .bash_profile
  • Test the ec2 tools:
ec2-describe-images -a | grep hadoop-ec2-images
  • verify that a list of images is printed out.
IMAGE	ami-ee53b687	hadoop-ec2-images/hadoop-0.17.0-i386.manifest.xml	111560892610	available	public
		i386	machine	aki-a71cf9ce	ari-a51cf9cc		instance-store
IMAGE	ami-f853b691	hadoop-ec2-images/hadoop-0.17.0-x86_64.manifest.xml	111560892610	available	public
		x86_64	machine	aki-b51cf9dc	ari-b31cf9da		instance-store