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Disaster Relief by the PoundCS5260 Semester ProjectUniversity of Colorado at Colorado Springs
By Robin Kimzey and Cliff McCullough02 May 2011
Disaster Relief Information Collection and Distribution Research Group
DRINCDR Main Page. February 15, 2011. http://gandalf.uccs.edu/drincdr/index.php/Main_Page (accessed April 23, 2011).
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MashupCombines data and functionality
from more than one sourceLayered content
◦ Each layer of content comes from different servers in the cloud
◦ Some layers are classified, others are not
Pound acts as a functional smoke screen providing one point of contact for users
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Implementation
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Easy MaintenanceNo hardware purchasesNo HVACNo rack space
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Remain DormantAmazon EC2: Turn on instances
once a month for updates and patches
When a disaster occurs, turn on more backend servers as demand increases
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DisadvantagesComputing services must be
geographically dispersedMust trust the security of the
commercial provider
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Pound Reverse Proxy
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Pound: FeaturesNot a serverSeparate layers of service
◦allows for isolated secure and un-secure backend servers
Backend server of any typeVirtual Host ServiceTracks backend servers that are
downFiltering
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SecurityPound requires minimal, initial
access with the hard-disk◦reads the configuration file◦reads the certificate◦reads error messages◦writes log entries
Normal operating activities are all in memory
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Pound ConfigurationListenHTTP
Address128.198.0.1
Port 80
Service
Backend
Address172.20.80.81
Port 80
End
Backend
Address172.20.80.82
Port 80
End
End
End
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Configure SSLListenHTTPS
Address128.198.0.1
Port 443
Cert "/etc/pound/pound.pem"
Service
Backend
Address172.20.43.81
Port 443
End
End
End
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FilteringCheckURL "(^\/|\.html|\.jpg|\.png)$"
Service
Backend
Address 172.20.80.81
Port 80
URL "(^\/|\.html|\.png)$"
End
Backend
Address 172.20.80.82
Port 80
URL "(^\/|\.html|\.jpg)$"
End
End
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Virtual HostService
HeadRequire "Host: .*www.drincdr.org.*"
Backend
Address 172.20.72.72
Port 80
End
End
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Session AwareService
. . .
Session
Type IP
TTL 300
End
Backend
. . .
End
End
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Demonstration
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Future WorkProperly evaluate customer
requirementsCompare Reverse Proxy Servers
◦Pound◦Apache◦Nginx
Backend network is plain textSingle point of failure
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Questions
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