Feeds

Ubuntu Koala food console gets its cron on

Scalr on schedule

Choosing a cloud hosting partner with confidence

Scalr - the open source admin console for Amazon's Elastic Compute Cloud and its Eucalyptus doppelganger - has added a cron job task manager to its arsenal, giving you more freedom to write and schedule scripts on sky-high virtual servers.

Like RightScale, Scalr provides web-based management console for so-called infrastructure clouds, services like Amazon's EC2 that provide on-demand access to scalable compute resources. Amazon now offers its own web interface, but services like Scalr and RightScale provide a few extras, and they dovetail with other, similar services, including Eucalyptus, the open source project that lets you mimic Amazon's setup in your own data center.

Eucalyptus is bundled with the latest Ubuntu. Thus the Karmic Koala tag. The NASA Ames Research Center is using Eucalyptus to build an infrastructure for federal government websites.

Cron jobs - scheduled commands or scripts - are typically tied to physical servers, Scalr founder and CEO Sebastian Stadil tells The Reg, and this can be problematic when you start scaling up your physical server to multiple virtual instances. The job could only be executed once per virtual server, and if a server failed, it couldn't be executed at all.

The new Scalr Scheduler solves this conundrum, letting you schedule scripts across server instances as you see fit. "The Scheduler extends Scalr’s scripting interface, and allows you to write scripts and set their execution schedule and scope: once on all servers, every hour on a subset of servers, daily on a single server, and any other combination," Stadil writes on the company blog.

The Scheduler is based on ZooKeeper, a sub-project of Hadoop, the open source distributed compute platform based on Google's proprietary infrastructure. The Apache-housed ZooKeeper is a means of juggling distributed services from a central location.

Stadil says the new Scheduler is now being used by about a dozen existing Scalr customers. He says it's particularly suited to streaming and encoding applications - apps that use cron jobs to to retrieve, transform, and store data. You might, say, store you videos on Amazon's S3 storage service and then use cron jobs to grab video and encode and then store it again.

Scalr is available in as web service at Scalr.net or you can install the same open source code on your own servers. The web service is free for websites in development, but when you go live it's $99 a month for an unlimited number of instances. For the local enterprise version, support contracts are available in Red Hat-like fashion. ®

Top 5 reasons to deploy VMware with Tegile

More from The Register

next story
'Kim Kardashian snaps naked selfies with a BLACKBERRY'. *Twitterati gasps*
More alleged private, nude celeb pics appear online
Wanna keep your data for 1,000 YEARS? No? Hard luck, HDS wants you to anyway
Combine Blu-ray and M-DISC and you get this monster
US boffins demo 'twisted radio' mux
OAM takes wireless signals to 32 Gbps
Google+ GOING, GOING ... ? Newbie Gmailers no longer forced into mandatory ID slurp
Mountain View distances itself from lame 'network thingy'
Apple flops out 2FA for iCloud in bid to stop future nude selfie leaks
Millions of 4chan users howl with laughter as Cupertino slams stable door
Students playing with impressive racks? Yes, it's cluster comp time
The most comprehensive coverage the world has ever seen. Ever
Run little spreadsheet, run! IBM's Watson is coming to gobble you up
Big Blue's big super's big appetite for big data in big clouds for big analytics
Seagate's triple-headed Cerberus could SAVE the DISK WORLD
... and possibly bring us even more HAMR time. Yay!
prev story

Whitepapers

Secure remote control for conventional and virtual desktops
Balancing user privacy and privileged access, in accordance with compliance frameworks and legislation. Evaluating any potential remote control choice.
Intelligent flash storage arrays
Tegile Intelligent Storage Arrays with IntelliFlash helps IT boost storage utilization and effciency while delivering unmatched storage savings and performance.
WIN a very cool portable ZX Spectrum
Win a one-off portable Spectrum built by legendary hardware hacker Ben Heck
High Performance for All
While HPC is not new, it has traditionally been seen as a specialist area – is it now geared up to meet more mainstream requirements?
Beginner's guide to SSL certificates
De-mystify the technology involved and give you the information you need to make the best decision when considering your online security options.