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Virtualizing AsteriskDespairing Myths and Legends
Nir Simionovich, Asterisk Guru
Greenfield Technologies Ltd.
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A bit about myself…• Founder of Greenfield Technologies Ltd
• Founder of the Israeli Asterisk Users group
• Started using Asterisk in 2002
• Author of the AsteriskNOW book from Packt Publishing (Mar 08)
• Author of the Asterisk Developer’s Guide book from Packt Publishing (Jan 09)
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Asterisk – A SysAdmin’s POV
• When most SysAdmins look at Asterisk, this is what they see:
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Myth I: * is a resource hog
• Asterisk requires a fair amount of resources in order to run properly.
• The things that turn Asterisk into a resource hog are the applications associated with it (AGI, AMI and others).
• Call center applications usually consume much resources.
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Myth II: * is a slow dialer
• Traditional Asterisk based dialers utilize the AMI interface for generating outbound calls, in its most simplistic form.
• While AMI had progressed over the years, traditional implementations are in capable is surpassing the 10 calls per second limitation.
• Companies build large infrastructures to sustain their needs
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Myth III: * Can’t run in a VM
• Myth III is a result of Myth I and Myth II together.
• After all, if Asterisk is a hog, and,
• Asterisk is a slow dialer, thus,
• Running Asterisk in a VM based environments is either complicated or impossible.
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Introducing PokeTalk.Com
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Why is PokeTalk interesting?
• PokeTalk.Com is an ad driven, web callback system based upon Asterisk.
• While it utilizes an Asterisk based dialer, its platform is completely virtualized – utilizing VMWARE Server.
• It currently operates 4 different Virtual Asterisk servers, capable of sustaining up to 100 dials per second and up to 800 concurrent channels.
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How does it work?
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The Architecture
VMWAREServer
VMWAREServer
MySQLDatabaseCluster
Firewall
Asterisk Dialer
Asterisk Dialer
Web Server
Web Server
Asterisk Dialer
Asterisk Dialer
Web Server
Web Server
ISP WebLBS
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Hardware Specification• Each VMWARE server is based upon the
following hardware:– Intel Dual Quad Core XEON Processors– 2 x RAID-1 SATA Drives (500GB)– 2 x Gigabit Ethernet– 16GB RAM
• In a VM environment, the more RAM you have the better – even if you don’t use all of it.
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Guest Operating System Setup
• CentOS 5.2 64bit Release• All services turned off• Active services include SSH and xinetd• VMWARE Server 1.0.4• Each Virtual server is setup as:
– Dual Core CPU– 2GB RAM– 40GB Hard Drive (static allocation)
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Dialer Operating System• CentOS 5.2 32Bit Release
• Asterisk 1.4.22
• MySQL 5
• PHP 5.2
• lighttpd web server
• FreePBX Management Interface
• Dialer is implemented in PHP and C++!
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The Dialer Application Setup
SIP Termination Partners
DialerHandler
Quaue Manager
Frontend Web
XML-RPCXML-RPC StatusReports
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A few service facts (Jan 09)
• Number of registered users > 90,000
• Max number of concurrent calls across the cluster: 360 calls
• Max number of concurrent requests served: 110 concurrent requests
• Total number of minutes served monthly > 2M minutes per month.
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Why virtualize Asterisk?• Enable better utilization of your hardware
money• Consolidate your services into single
hardware infrastucture• Utilizing Open/Free virtualization
technologies will lower your overall TCO• Virtualizing Asterisk installations can
negate the need for multi-tennent systems and IP centrex
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Asterisk Clouding• Currently, there are working installations
of Asterisk utilizing Amazon EC2• As a test, we’ve installed the dialer
application on EC2 based instances• The added value of running virtual dialers
using EC2 is to get the dialer power you need – when you need it and not more
• Performance during the test was identical to that of VMWARE dedicated servers
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Where to from here?
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Development from the past…
• Today’s over excessive use of VM type run- time environments do not fit well with virtualization
• Working with virtual servers require a return to basics for most developers, returning to paradigms of high-speed optimizations and low memory foot prints
• The more optimal your runtime is, the more performance you’ll get from your virtual servers environment
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Optimize for -
Execute like -
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Pooled Provisioning• Handling multiple VM images (or EC2 AMIs)
can be a hassle• Utilizing pooled provisioning and programmatic
API’s, your provisioning process can be centralized and simple
• Maintain a single VM image instance (or EC2 AMI), and deploy your software from a central location
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Yes We Can!Yes We Can!
Barak H. Obama Image taken from http://www.obamarama.org
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Rules of thumb for Asterisk Virtualization
• Ensure proper coding techniques to lower platform overheads
• Utilize central pooling provisioning for ease of management
• Make use of programmatic API’s in a layered platform approach
• Ensure proper caching in your application
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Questions?• Contact Information:
– Nir Simionovich– (e) [email protected]– (p) +972-73-2557799– (w) http://www.simionovich.com– (w) http://www.greenfieldtech.net– (w) http://www.asterisk.org.il– (MSN) [email protected]