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CloudStack, jclouds, Jenkins and CloudCat
This document discusses jclouds, an open source multi-cloud library, and how it can be used with CloudStack. It describes how jclouds supports the standard and lower-level CloudStack APIs, and provides examples of using jclouds with CloudStack for provisioning Jenkins build slaves and building an application called CloudCat that allows provisioning and reporting within CloudStack.
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CloudStack, jclouds, Jenkins and CloudCat
- 1. CloudStack and jclouds Andrew Bayer @abayer Saturday, December 1, 2012
- 2. What is jclouds? • Portable Java API for many cloud APIs and providers • Compute and Blobstore • Lower-level Java API for cloud-specific APIs as well • Usable with any JVM language Saturday, December 1, 2012
- 3. CloudStack and jclouds • CloudStack is supported by jclouds • 2.x and 3.x tested regularly • 4.x hasn’t been tested much yet, but minimal API changes from 3.x Saturday, December 1, 2012
- 4. Standard jclouds API and CloudStack • CloudStack support for jcloud standard API: • Instance creation/management • Listing available “hardware” (service offerings), “images” (templates) • Security groups Saturday, December 1, 2012
- 5. Lower-level CloudStack API with jclouds • Pretty much everything the CloudStack API can do is implemented in jclouds • Administration tasks • Template creation • User management • Much, much more Saturday, December 1, 2012
- 6. What can youdo with jclouds and CloudStack? Saturday, December 1, 2012
- 7. A lot. Here are some examples. Saturday, December 1, 2012
- 8. jclouds Jenkins plugin • Dynamically provision Jenkins build slaves from CloudStack (or any other supported cloud) • Much like the Jenkins ec2 plugin, but more features and obviously more clouds Saturday, December 1, 2012
- 9. How the Jenkinsplugin works • Uses standard jclouds API for instance creation and destruction • Allows you to choose “image” or OS family/version, and “hardware” (from list of available) or minimum CPU/RAM • Uses underlying clouds’ APIs to find the right image/hardware for the given input Saturday, December 1, 2012
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- 15. Single use slave • The single use slave option lets you use a slave once and only once • Slave is marked offline after job completes, guaranteeing the next time that job runs, it gets a fresh slave Saturday, December 1, 2012
- 16. Jenkins Instance Creation • Create instances at beginning of build, tear down instances at end of build • Use clouds and templates available as slaves • Exposes IPs of instances to build steps • Useful for testing clusters, etc Saturday, December 1, 2012
- 17. Building an appusing CloudStack and jclouds Saturday, December 1, 2012
- 18. CloudCat • Open source, Grails-based reporting and provisioning application for CloudStack • github.com/abayer/cloudcat Saturday, December 1, 2012
- 19. Using Lower-Level API • CloudStack admin information (accounts, hosts, etc) not available through jclouds standard API • So we’ve got to use the CloudStack API itself - which we can do through jclouds! • Same jclouds connection whether using standard API or CloudStack-specific Saturday, December 1, 2012
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- 21. Mapping CloudStack Data • jclouds has objects for data from CloudStack API • VirtualMachine, Template, ServiceOffering, etc • In CloudCat, we map those objects to Grails domain classes Saturday, December 1, 2012
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- 23. Importing CloudStack data into Grails • Run API commands as admin • Persist results into database once an hour, rather than querying API live • Pull credentials and endpoint from config domain object • Use jclouds’ *Clients to get lists of hosts, templates, service offerings, instances Saturday, December 1, 2012
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- 25. Associating templates, instances, etc • We want to know how instances, templates, service offerings and hosts are related • We want to keep historical information on instances, and know what instances were still existent the last time we got reported data Saturday, December 1, 2012
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- 27. Alert Notification • Email notification when CloudStack has problems - not available in CloudStack itself, so far as I can tell. • Events and alerts are available from the API - check periodically for new alerts, send email when new ones are seen. Saturday, December 1, 2012
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- 29. Alert Email Content Saturday,December 1, 2012
- 30. Provisioning through CloudCat • CloudStack UI for instance creation doesn’t make it easy to create a bunch of otherwise identical instances • Hence, CloudCat provisioned instance groups Saturday, December 1, 2012
- 31. jclouds standard APIor CloudStack-specific? • jclouds provides instance creation in a standard way across all clouds, including CloudStack • But the standard instance creation makes a lot of largely redundant API calls, especially to guarantee instance name uniqueness Saturday, December 1, 2012
- 32. jclouds standard APIor CloudStack-specific? • We can guarantee uniqueness within CloudCat • Using lower level CloudStack API (still through jclouds) improves performance considerably • Especially since we’re doing API calls as admin user Saturday, December 1, 2012
- 33. Speaking of accounts... • How do we create instances for a logged-in user while making API calls as admin? Two options: • Use account and domainid options for deployVirtualMachine • Fetch account’s keys and make API call using those keys Saturday, December 1, 2012
- 34. Speaking of accounts... • After experimentation, I went with using the logged-in user’s account’s keys • Less API traffic when run as logged-in user Saturday, December 1, 2012
- 35. Grails • Groovy • Rails-like • I’m lazy and bad with UIs, so I like getting sortable tables, MVC, and much more for free, with even more available from plugins! Saturday, December 1, 2012
- 36. So how doesthis all look? Saturday, December 1, 2012
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- 38. Logged in Saturday, December1, 2012
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- 47. Instance group list Saturday,December 1, 2012
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- 49. Known Issues • I’m not a very good programmer! • Only really tested with basic networking • Init script requires hardcoded credentials on instances • Needs work on packaging/installation • Only one user so far! Saturday, December 1, 2012
- 50. More Information • jclouds: http://jclouds.org • jclouds Jenkins plugin: https://wiki.jenkins- ci.org/display/JENKINS/JClouds+Plugin • CloudCat • source: http://github.com/abayer/cloudcat • demo: http://cloudcat.andrewbayer.com Saturday, December 1, 2012
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