drmalathisaravanan / ex-6-gae

Cloud computing

Ex-6-GAE

Date: Aim: ToinstallGoogleAppEngine.Createhelloworldappandothersimplewebapplicationsusingpython/java

GoogleCloudPlatform(GCP)

GoogleCloudPlatform(GCP),offeredbyGoogle,isasuiteofcloud computingservicesthatrunsonthesameinfrastructurethatGoogleuses internally for its end-user products, such as Google Search,Gmail,filestorage, andYouTube. Alongsideasetofmanagementtools,itprovidesaseriesofmodularcloudservicesincludingcomputing,datastorage,dataanalyticsandmachinelearning. GoogleCloudPlatformprovidesinfrastructureasaservice,platformasaservice,andserverlesscomputingenvironments.

Platform asaService(PaaS) Cloudcomputingservicewhichprovidesacomputingplatformandasolutionstack asaservice. Consumercreatesthesoftwareusingtoolsand/or libraries fromtheprovider. Providerprovidesthenetworks,servers,storage,etc.

GoogleAppEngine:

GoogleAppEnginewasfirstreleasedasabetaversioninApril2008. 2 5

It isaisa PlatformasaService(PaaS)cloudcomputingplatformfordevelopingandhostingwebapplicationsinGoogle-manageddatacenters. Google‘sAppEngineopensGoogle‘sproductiontoanypersonintheworldatno charge. GoogleAppEngineissoftwarethat facilitatestheusertorunhiswebapplicationsonGoogleinfrastructure. Itismorereliablebecausefailureofanyserver willnotaffecteithertheperformanceoftheenduserortheserviceoftheGoogle. Itvirtualizesapplicationsacross multipleserversanddatacenters. Othercloud-basedplatformsincludeofferingssuchas Amazon Web

ServicesandMicrosoft's AzureServices Platform.

IntroductionofGoogleAppEngine GoogleAppEngineletsyourunyourwebapplicationsonGoogle'sinfrastructure. App Engine applications are easy to build, easy to maintain,andeasytoscaleasyourtrafficanddatastorageneedsgrow.WithAppEngine,there are no servers to maintain :You just upload your application, and it'sreadytoserveyourusers. You can serve your app from your own domain name (suchas https://www.example.com/) using Google Apps. Or, you can serve yourapp using a free name on the appspot.com domain. You can share yourapplicationwiththeworld, orlimitaccesstomembersofyour organization. GoogleAppEnginesupportsappswritteninseveral programminglanguages. With AppEngine'sJavaruntimeenvironment,youcan buildyourappusingstandardJavatechnologies,includingtheJVM,Javaservlets,andtheJavaprogramming language—oranyotherlanguageusingaJVM-basedinterpreterorcompiler,suchasJavaScriptorRuby. AppEnginealsofeaturesadedicatedPythonruntimeenvironment,whichincludesafastPythoninterpreter and thePythonstandardlibrary.TheJavaandPythonruntimeenvironmentsarebuilttoensurethatyourapplicationrunsquickly,securely,andwithoutinterferencefromotherappsonthesystem. With AppEngine, you only pay for what you use. There are no set-up costsand no recurring fees. The resources your application uses, such as storageandbandwidth,aremeasuredbythegigabyte,andbilledatcompetitiverates.You control the maximum amounts of resources your app can consume, so italwaysstayswithinyourbudget.App Enginecostsnothingto getstarted. Allapplicationscanuseupto500MBofstorageandenoughCPUandbandwidth to support an efficient app serving around 5million page views amonth,absolutelyfree.Whenyouenablebillingforyourapplication,yourfreelimits are raised, and you only pay for resources you use above the freelevels. Architecture ofGoogleAppEngine

FeaturesofGoogleAppEngine

GAEApplicationEnvironment:

Google App Engine makesit easy tobuild an application that runs reliably,even under heavy load and with large amounts of data. App Engine includes thefollowingfeatures: Persistentstoragewithqueries, sortingandtransactions Automaticscalingandloadbalancing APIsforauthenticatingusersandsendingemailusingGoogleAccounts Taskqueuesforperforming workoutsideofthescopeofawebrequest Scheduledtasksfortriggering eventsatspecifiedtimesandregularintervals

Dynamicwebserving,withfullsupport forcommonwebtechnologies

JavaRuntimeEnvironment

You can develop your application for the Java runtime environment usingcommon Java web development tools and API standards. Your app interactswith the environment using the Java Servlets standard, and can use commonwebapplication technologiessuchasJavaServerPages TheJavaruntimeenvironmentusesJava6.TheAppEngineJavaSDKsupports developing apps using either Java5 or 6.The environment includestheJavaSERuntimeEnvironment(JRE)6platformandlibraries.TherestrictionsofthesandboxenvironmentareimplementedintheJVM.Anappcan use any JVM byte code or library feature, as long as it does not exceedthesandboxrestrictions.Forinstance,bytecodethatattemptstoopenasocketorwritetoafilewillthrow aruntimeexception. YourappaccessesmostAppEngineservicesusingJavastandardAPIs.Forthe AppEngine data store, the Java SDK includes implementations of the JavaDataObjects(JDO)andJavaPersistenceAPI(JPA)interfaces.Yourappcanuse the JavaMailAPItosend emailmessageswiththeAppEngineMailservice.Thejava.netHTTPAPIsaccessestheAppEngineURLfetchservice. AppEnginealsoincludeslow-levelAPIsforitsservicestoimplementadditionaladapters,ortousedirectlyfromtheapplication.Seethedocumentationforthedatastore,memcache,URLfetch,mail,imagesandGoogleAccountsAPIs.Typically,JavadevelopersusetheJava programming languageandAPIstoimplementwebapplicationsfortheJVM. WiththeuseofJVM-compatiblecompilersorinterpreters,youcanalso useotherlanguagestodevelopwebapplications,suchas JavaScript,Ruby.

WorkflowofGoogleAppEngine

Step1:Logintowww.cloud.google.com

Step2:GotoConsole

Step3:GoogleCloudPlatformisshown

Step4:ClickDashboardintheGoogleCloudPlaform

Step5:DashboardintheGoogleCloudPlaform

Step6:ClickNewProjectandgiveuniqueProjectName.

Example:kcet-cloud-project

Step7:GoogleAppEngineisinitated

Step8: ClickcreateApplication

Step9:CreateappandSelectLanguagePython

Step10: PythonappiscreatedinGoogleAppEngine

Step11 :PythonappEngineapplicationiscreated

Step12:ClickCloudShellintheKathir-Cloud-Project

Step13:CreateaDirectoryPythonProjectusingmkdircommand

Syntax: mkdirPythonProject Step14:ClickEditortocreatePython application

Step 15:ClickNew Filein thePythonProjectFolder(Pythonfile)

Step16:Createmain.pyfile

main.pyfile

print("HelloWorld")

Step17:Createapp.yamlfile

app.yaml

runtime:python27api-version:1threadsafe:falsehandlers: url:1script:Index.py

Step18:Createrequirements.txtfile

requirements.txt Flask= =0.11.1 gunicorn==19.6.0

Step19:MovetoCloudShellEnvironmenttoruntheapplication

Step20:MovetoCloudShellEnvironmenttoruntheapplication Syntax:gcloudappdeploy

Continuetheapplication.Itenableserviceonthegivenproject

Itstartedbuildingtheobjectandfetchingthestorageobjectforthecreatedapplication

Itisupdatingtheservice

TheapplicationissuccessfullydeployedandURLishttps://expanded- curve-289413.uc.r.appspot.com Step21:Run yourprograminthebrowser

Step22:Hello WorldProgramissucessfullyruninthebrowser

Result:

Thus the Google App Engine is installed successfully and a web application todisplayhelloworldusingpythonisdevelopedanddeployedintheGAEandusedGAELaunchertolaunchthe webapplications.