server side technologies
Post on 16-Feb-2017
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Server Side Technologies Server Side Technologies
by:by: Michael Wakahe, Michael Wakahe,
EntrepreneurEntrepreneur20102010
Definition of ServerDefinition of Server Client-Server model is where client Client-Server model is where client
modules make requests for modules make requests for information to a server module, the information to a server module, the server processes and sends back server processes and sends back responseresponse
Server usually more capable than Server usually more capable than clients, servers usually fewer in clients, servers usually fewer in number than clientsnumber than clients
Definition of Server – Client-Definition of Server – Client-ServerServer
Definition of ServerDefinition of Server Other model: Peer-to-peerOther model: Peer-to-peer
In Peer-to-peer, participants act both In Peer-to-peer, participants act both as clients and serversas clients and servers
Participants are equally capable, Participants are equally capable, have equal privilegeshave equal privileges
Definition of Server – Peer-to-Definition of Server – Peer-to-peerpeer
Definition of ServerDefinition of Server
What exactly is a What exactly is a server?server? HardwareHardware SoftwareSoftware A combinationA combination
Server HardwareServer Hardware 3 main categories3 main categories
Tower, Rack Mount, BladeTower, Rack Mount, Blade
Server Hardware - TowerServer Hardware - Tower
Dell PowerEdge T300
Server Hardware – Rack Server Hardware – Rack MountMount
Dell PowerEdge R200
Server Hardware – BladeServer Hardware – BladeHP Blade Server
Server Hardware - FeaturesServer Hardware - Features Generally more capable than desktops Generally more capable than desktops
and laptopsand laptops More RAM, storage spaceMore RAM, storage space Powerful processor(s), multiple processorsPowerful processor(s), multiple processors RAIDRAID Hot swappable componentsHot swappable components
Server Hardware - FeaturesServer Hardware - Features
More connectivity – multiple ethernet More connectivity – multiple ethernet / fibre ports/ fibre ports
Redundant power supplyRedundant power supply Robust casingRobust casing Remote monitoringRemote monitoring
Server Hardware - FeaturesServer Hardware - Features Native virtualization support – Cloud Native virtualization support – Cloud
ComputingComputing Can run for years without rebootingCan run for years without rebooting Better support & warrantyBetter support & warranty Main worldwide vendors: IBM, HP, DellMain worldwide vendors: IBM, HP, Dell Expensive: Kshs. 100,000/- upwardsExpensive: Kshs. 100,000/- upwards
Server Hardware - LocationServer Hardware - Location Usually stored in special server rooms, within Usually stored in special server rooms, within
business premises or colocation facilitiesbusiness premises or colocation facilities Features of server rooms and colocation Features of server rooms and colocation
centres:centres: SecureSecure Temperature controlledTemperature controlled CabinetsCabinets Redundant Power Redundant Power Public IPs (world viewable)Public IPs (world viewable)
Server Hardware - LocationServer Hardware - Location Features of server rooms and colocation Features of server rooms and colocation
centres (continued):Spike and Surge protectioncentres (continued):Spike and Surge protection High bandwidth availability - redundantHigh bandwidth availability - redundant Monitoring – cameras, sensorsMonitoring – cameras, sensors Fire proof, Earthquake proofFire proof, Earthquake proof Qualified staffQualified staff
Local examples: Access Kenya, UUNET, KDNLocal examples: Access Kenya, UUNET, KDN
Server Hardware - LocationServer Hardware - Location
Server Hardware - LocationServer Hardware - Location
Server Software – Operating Server Software – Operating SystemsSystems
Control hardware, provide abstraction for Control hardware, provide abstraction for softwaresoftware
2 main categories: Windows based and 2 main categories: Windows based and Unix derivativesUnix derivatives
Windows: based on Windows NT; Windows Windows: based on Windows NT; Windows Server 2000, 2003, 2008Server 2000, 2003, 2008
Each version has different flavours, e.g. Each version has different flavours, e.g. small business, standard, enterprise, data small business, standard, enterprise, data centrecentre
Server Software – Operating Server Software – Operating SystemsSystems
Unix based: old Unix (AT&T, Bell Unix based: old Unix (AT&T, Bell Labs), BSD, Solaris, LinuxLabs), BSD, Solaris, Linux
Windows servers more prevalent Windows servers more prevalent because of easy-to-use Graphical because of easy-to-use Graphical User InterfaceUser Interface
Server Software – Operating Server Software – Operating SystemsSystems
Features of Server Operating SystemsFeatures of Server Operating Systems Robust – even during HW failureRobust – even during HW failure Multiple security features including firewalls Multiple security features including firewalls
& intrusion detection& intrusion detection Remote administrationRemote administration Extensive audit trail – both people & Extensive audit trail – both people &
softwaresoftware Tight coupling with hardwareTight coupling with hardware
Server Software – Operating Server Software – Operating SystemsSystems
Features of Server Operating SystemsFeatures of Server Operating Systems Generally more capable on operating system Generally more capable on operating system
features e.g. threading (concurrency)features e.g. threading (concurrency) handle more varied and larger file systemshandle more varied and larger file systems handle more RAM & virtual memoryhandle more RAM & virtual memory Support for many hardware platformsSupport for many hardware platforms better performancebetter performance
Server Software - Server Software - ApplicationApplication
Application layer is what “talks” Application layer is what “talks” directly to mobile applicationsdirectly to mobile applications
Traffic can be circuit switched e.g. Traffic can be circuit switched e.g. SMS or packet switched (Internet)SMS or packet switched (Internet)
Circuit switched traffic usually Circuit switched traffic usually converted to packet switched (Short converted to packet switched (Short Message Peer-to- Peer - SMPP)Message Peer-to- Peer - SMPP)
Server Software - Server Software - ApplicationApplication
Packet switched information is “layered”Packet switched information is “layered” Mobile applications usually communicate in Mobile applications usually communicate in
one of the 3 following layers:TCP / UDPone of the 3 following layers:TCP / UDP Application e.g. HTTP, FTPApplication e.g. HTTP, FTP Protocols built on application layer e.g. XML, Protocols built on application layer e.g. XML,
SOAP, RMISOAP, RMI
Server Software - Server Software - ApplicationApplication
Software that services client requests: Software that services client requests: Application ServerApplication Server
Various application servers, can be Various application servers, can be classified by programming languageclassified by programming language
Main languages for server side Main languages for server side programming: Microsoft .NET framework programming: Microsoft .NET framework (C Sharp, J Sharp), Java & J2EE, PHP(C Sharp, J Sharp), Java & J2EE, PHP
Server Software - Server Software - ApplicationApplication
.NET framework offers libraries that are .NET framework offers libraries that are tightly coupled with the operating tightly coupled with the operating system that can act as an application system that can act as an application serverserver
Java Application Servers: Tomcat, Java Application Servers: Tomcat, Weblogic, Websphere, Glassfish, JBossWeblogic, Websphere, Glassfish, JBoss
Main PHP application server: ApacheMain PHP application server: Apache Other application servers in other Other application servers in other
languageslanguages
Server Software - Server Software - ApplicationApplication
Server side requires persistence – Server side requires persistence – SQL databasesSQL databases
Main vendors: Oracle, MySQL, Main vendors: Oracle, MySQL, Ingress Microsoft SQL Server, Ingress Microsoft SQL Server, Postgres, Sybase, DB2Postgres, Sybase, DB2
Some offer special features e.g. Some offer special features e.g. replication, clusteringreplication, clustering
Oracle is the leaderOracle is the leader
Server Software - Server Software - ApplicationApplication
Special features of application Special features of application servers and databases:servers and databases: RobustnessRobustness Clustering / Load balancingClustering / Load balancing VirtualizationVirtualization Security (code isolation, cryptography)Security (code isolation, cryptography) Remote monitoringRemote monitoring Advanced programming techniquesAdvanced programming techniques
Server Software - Server Software - ApplicationApplication
Some application servers and Some application servers and databases may have yet other databases may have yet other additional features e.g. portal additional features e.g. portal development, OS integration, mobile development, OS integration, mobile integrationintegration
Usually they come with special Usually they come with special developer tools: programming, developer tools: programming, debugging, testing etcdebugging, testing etc
Server Software - Server Software - ApplicationApplication
Software models:Software models: Closed vs Open SourceClosed vs Open Source Proprietary vs FreeProprietary vs Free
Server Software - Server Software - ApplicationApplication
Server side software captures Server side software captures business logicbusiness logic
Client should be as thin as possibleClient should be as thin as possible Software is built in modulesSoftware is built in modules Multi-tiered approachMulti-tiered approach
Server Software - Server Software - ApplicationApplication
Case Study: Strathmore Mobile SystemCase Study: Strathmore Mobile System Strathmore wants an SMS and Mobile Strathmore wants an SMS and Mobile
Application SystemApplication System Students can check grades, fees, Students can check grades, fees,
timetablestimetables Some of the modules: Communication, Some of the modules: Communication,
Authentication, Billing, Audit, Remote Authentication, Billing, Audit, Remote Monitoring & Administration, BackupMonitoring & Administration, Backup
Servers - The Big PictureServers - The Big Picture
Server SoftwareServer SoftwareThe EndThe End
Michael Wakahe,Michael Wakahe,Tawi Commercial Services LtdTawi Commercial Services Ltd
+254 (0)20-239-3052+254 (0)20-239-3052michael@tawi.mobi
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