Problem attaching and mounting an EBS volume

[Paolo Di Tommaso]

Dear all, 

I'm using JClouds to starting and configure a EC2 cluster. My idea is to start a instance, attach a volume that I've created previously, and mount the attach volume. 

So I'm doing something like this 

:

Attachment attachment = ebsClient.attachVolumeInRegion(regionId, volumeId, nodeId, "/dev/sdh")

RunScriptOptions opt = new RunScriptOptions().runAsRoot(true)

def mountScript = "mkdir -p /data; mount /dev/sdh /data "

compute.runScriptOnNode(nodeId, mountScript, opt)

But when I login in the instance the volume is attached but NOT mounted and I have to do it manually. 

I'm supposing that I need to monitor the Attachment status waiting the volume to be in the ATTACHED status. 

To do that would be enough something like this: 

while( attachment.getStatus() != Status.ATTACHED ) {

  sleep( 30 000 )

}

or it is required to query explicitly for the volume attachment status using the describeVolumesInRegion() api ? 

Any other suggestions is welcome. 

Thank you, 

Paolo

[Adrian Cole]

Hi, Paulo.

looks like you know what you need to do.  I recommend this for the retry thingy.

1. switch to jclouds 1.4.0-rc.2 (as it is cool)
2.      

VolumeAttached volumeAttached = context.utils().injector().getInstance(VolumeAttached.class);
      attachTester = new RetryablePredicate<Attachment>(volumeAttached, 60, 1, TimeUnit.SECONDS);

3. attachTester.apply(attachment) // or die, etc.

sound good?

-A

Paolo

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[Paolo Di Tommaso]

Hi Adrian, 

Thanks for your quick reply. Well, the latest version seems really cool. 

Is there any document or whatever to know more about it ? 

Cheers,

Paolo

[Adrian Cole]

1.4 coolness is best expressed "minecraft cool"

https://github.com/jclouds/jclouds-examples/tree/master/minecraft-compute

• We don't have release docs, yet, as 1.4 isn't final, but the above uses a lot of new tricks including event bus.

-A

[sk007]

Hi Adrian,

In jclouds, is there any event driven model for listening events such as volume attached, detached ?

Thanks

Sk

[Adrian Cole]

No, there's only polling at the moment. Amazon doesn't do push notifications.

> https://groups.google.com/d/msg/jclouds/-/mWG0TjmIqWEJ.

[sk007]

Hi Adrian,

Thanks for your prompt response. 

Somewhere in net, I got, 30 seconds is a good polling interval.

I think, optimized polling interval depends on AWS, network, volume/image size. Do you have any suggestion on optimizing or tuning polling interval?

Thanks

Sk