Amazon EC2 (aws-ec2) and compatible apis such as Eucalyptus (eucalyptus) include support for remountable block devices, called EBS. In jclouds, control features for this are exposed in 3 ways: hooks within ComputeService (EC2TemplateOptions and viewing via NodeMetadata), directly through the provider api (ElasticBlockStoreClient), and our clojure functions (ebs2.clj).
jclouds reports current status of volume mappings inside a Node's Hardware field. You can setup volume mappings with extended template options.
EBS volumes will report in the collection returned by node.getHardware().getVolumes() as type Volume.Type.SAN
jclouds also has a means to setup volume mappings when you start your nodes. Here's an example:
{% highlight java %} template.getOptions().as(EC2TemplateOptions.class) // .unmapDeviceNamed(“/dev/foo) .mapEphemeralDeviceToDeviceName(”/dev/sdm", “ephemeral0”) .mapNewVolumeToDeviceName(“/dev/sdn”, volumeSize, true) .mapEBSSnapshotToDeviceName(“/dev/sdo”, snapshot.getId(), volumeSize, true); {% endhighlight %}
Getting access to the client
{% highlight java %} ElasticBlockStoreClient ebsClient = EC2Client.class.cast(context.getProviderSpecificContext().getApi()) .getElasticBlockStoreServices(); {% endhighlight %}
Generating a snapshot
{% highlight java %} Snapshot snapshot = ebsClient.createSnapshotInRegion(volume.getRegion(), volume.getId()); {% endhighlight %}
{% highlight clojure %} (use 'org.jclouds.ec2.ebs2)
(def ec2 (compute-service “aws-ec2” “ACCESSKEY” “SECRETKEY” :sshj))
(volumes ec2) {% endhighlight %}