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Deploying MongoDB on Azure Sridhar Nanjundeswaran, Software Engineer, 10gen @snanjund sridhar@10gen.com

Agenda • Why? • Implementation details • Usage walkthrough

Windows Azure Platform • Microsoft’s cloud platform to build, host and scale applications • Hosted in Microsoft data centers Compute Storage Management Relational data Marketplace Middleware CDN Management

MongoDB on Windows Azure

Details of the MongoDB worker role Implementation Details

Highlights • Uses standard MongoDB binaries • Code is open sourced • Works with VS Express • Data persisted on blob storage

Details • OnStart • Register change notifiers • Mount Blob • Start mongod • ReplSet Initialize • Run • Run cloud command

Details - contd • OnStop • Stepdown • Stop mongod • Unmount blobs

Challenges • Debugging • IP potentially changes on reboot • DNS within mongodb. New cloud command • Testing IP change • Reduce instance count and increase • Keeping both sets of configurations in sync

Download->Setup->Develop->Debug->Deploy Now let’s use it

Setup: Setup Develo p Debug Deploy Monitor

Develop • Use solution without sample • Add your worker/web role code to it Setup Develop Debug Deploy Monitor

Debugging - Locally • Debugging on emulator works great. • Cloud storage is emulated as local mounted drives • Cannot use to test config changes • csrun /run:; • csrun /update:; • csrun /remove: Setup Develo p Debug Deploy Monitor

Deploy • Create storage account • Get key • Create service • Specify storage account/key in solution • Enable RDP when packaging Setup Develo p Debug Deploy Monitor

Debugging - deployed • Change runtime config and use RDP • MongoDBLogVerbosity - increase • RecycleOnExit – set to false • Tools • AzureDiagnosticsManager – get diagnostics logs, perf counters from deployed instance • AzureHostedServicesManagerBinary – edit config of running instance • CloudXplorer – download blobs Setup Develo p Debug Deploy Monitor

Monitor Setup Develo p Debug Deploy Monitor

Pitfalls • Bandwidth • Requires at least medium instance • Debugging locally • Config change cause restarts • Deployment • Storage and compute in same region, use affinity group • Check http vs https • Continuous restarts

The Future • Scale out using replica sets • MongoDB Monitoring • Backup and Recovery • Sharding • Publish logs to external storage?

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The Solution • Source • https://github.com/mongodb/mongo-azure • Documentation • http://www.mongodb.org/display/DOCS/ MongoDB+on+Azure • Issues • mongodb-user google group • #mongodb IRC • https://jira.mongodb.org/browse/AZURE