Below is the api debug output
========================
# euca-version &&euca-describe-instances  --debug
euca2ools 2.0.2
2012-05-23 12:40:37,458 euca2ools [DEBUG]:Method: POST
2012-05-23 12:40:37,458 euca2ools [DEBUG]:Path: /services/Eucalyptus/
2012-05-23 12:40:37,458 euca2ools [DEBUG]:Data: 
2012-05-23 12:40:37,458 euca2ools [DEBUG]:Headers: {}
2012-05-23 12:40:37,458 euca2ools [DEBUG]:Host: eucalyptus.partner.eucalyptus.com:8773
2012-05-23 12:40:37,458 euca2ools [DEBUG]:establishing HTTP connection: kwargs={}
2012-05-23 12:40:37,458 euca2ools [DEBUG]:using _calc_signature_2
2012-05-23 12:40:37,459 euca2ools [DEBUG]:query string: AWSAccessKeyId=QE37NMCM9RIH8IVDFIUQA&Action=DescribeInstances&SignatureMethod=HmacSHA256&SignatureVersion=2&Timestamp=2012-05-23T16%3A40%3A37Z&Version=2010-08-31
2012-05-23 12:40:37,459 euca2ools [DEBUG]:string_to_sign: POST
eucalyptus.partner.eucalyptus.com:8773
/services/Eucalyptus/
AWSAccessKeyId=QE37NMCM9RIH8IVDFIUQA&Action=DescribeInstances&SignatureMethod=HmacSHA256&SignatureVersion=2&Timestamp=2012-05-23T16%3A40%3A37Z&Version=2010-08-31
2012-05-23 12:40:37,459 euca2ools [DEBUG]:len(b64)=44
2012-05-23 12:40:37,460 euca2ools [DEBUG]:base64 encoded digest: 1wSnmFTaRmmyVUAoKaBeaw9NJ/Uj/yruFd1gnLfKg5k=
2012-05-23 12:40:37,460 euca2ools [DEBUG]:query_string: AWSAccessKeyId=QE37NMCM9RIH8IVDFIUQA&Action=DescribeInstances&SignatureMethod=HmacSHA256&SignatureVersion=2&Timestamp=2012-05-23T16%3A40%3A37Z&Version=2010-08-31 Signature: 1wSnmFTaRmmyVUAoKaBeaw9NJ/Uj/yruFd1gnLfKg5k=
send: 'POST /services/Eucalyptus/ HTTP/1.1\r\nHost: eucalyptus.partner.eucalyptus.com:8773\r\nAccept-Encoding: identity\r\nContent-Length: 218\r\nContent-Type: application/x-www-form-urlencoded; charset=UTF-8\r\nUser-Agent: Boto/2.1.1 (linux2)\r\n\r\n'
send: 'AWSAccessKeyId=QE37NMCM9RIH8IVDFIUQA&Action=DescribeInstances&SignatureMethod=HmacSHA256&SignatureVersion=2&Timestamp=2012-05-23T16%3A40%3A37Z&Version=2010-08-31&Signature=1wSnmFTaRmmyVUAoKaBeaw9NJ/Uj/yruFd1gnLfKg5k%3D'
reply: 'HTTP/1.1 200 OK\r\n'
header: Content-Length: 2325
header: Content-Type: application/xml; charset=UTF-8
2012-05-23 12:40:38,113 euca2ools [DEBUG]:<DescribeInstancesResponse xmlns="http://ec2.amazonaws.com/doc/2010-08-31/"><reservationSet><item><reservationId>r-4DDD4183</reservationId><ownerId>264471547257</ownerId><groupSet><item><groupId>default-a</groupId></item></groupSet><instancesSet><item><instanceId>i-C3AC40FE</instanceId><imageId>emi-2C27388C</imageId><instanceState><code>16</code><name>running</name></instanceState><privateDnsName>euca-10-9-180-21.eucalyptus.internal</privateDnsName><dnsName>euca-173-205-188-82.eucalyptus.partner.eucalyptus.com</dnsName><reason>NORMAL:  -- []</reason><keyName>jds-admin</keyName><amiLaunchIndex>0</amiLaunchIndex><productCodes/><instanceType>c1.medium</instanceType><launchTime>2012-05-16T18:45:52Z</launchTime><placement><availabilityZone>partner01</availabilityZone></placement><kernelId>eki-534D3816</kernelId><ramdiskId>eri-9CEF373F</ramdiskId><monitoring><state>false</state></monitoring><privateIpAddress>euca-10-9-180-21.eucalyptus.internal</privateIpAddress><ipAddress>euca-173-205-188-82.eucalyptus.partner.eucalyptus.com</ipAddress><rootDeviceType>instance-store</rootDeviceType><rootDeviceName>/dev/sda1</rootDeviceName><blockDeviceMapping/></item></instancesSet></item><item><reservationId>r-DAFE3FFC</reservationId><ownerId>264471547257</ownerId><groupSet><item><groupId>default-a</groupId></item></groupSet><instancesSet><item><instanceId>i-F4BB4471</instanceId><imageId>emi-2C27388C</imageId><instanceState><code>16</code><name>running</name></instanceState><privateDnsName>euca-10-9-180-19.eucalyptus.internal</privateDnsName><dnsName>euca-173-205-188-81.eucalyptus.partner.eucalyptus.com</dnsName><reason>NORMAL:  -- []</reason><keyName>jds-admin2</keyName><amiLaunchIndex>0</amiLaunchIndex><productCodes/><instanceType>m1.large</instanceType><launchTime>2012-05-21T16:35:09Z</launchTime><placement><availabilityZone>partner01</availabilityZone></placement><kernelId>eki-534D3816</kernelId><ramdiskId>eri-9CEF373F</ramdiskId><monitoring><state>false</state></monitoring><privateIpAddress>euca-10-9-180-19.eucalyptus.internal</privateIpAddress><ipAddress>euca-173-205-188-81.eucalyptus.partner.eucalyptus.com</ipAddress><rootDeviceType>instance-store</rootDeviceType><rootDeviceName>/dev/sda1</rootDeviceName><blockDeviceMapping/></item></instancesSet></item></reservationSet></DescribeInstancesResponse>
RESERVATION	r-4DDD4183	264471547257	default-a
INSTANCE	i-C3AC40FE	emi-2C27388C	euca-173-205-188-82.eucalyptus.partner.eucalyptus.com	euca-10-9-180-21.eucalyptus.internal	running	jds-admin	0		c1.medium	2012-05-16T18:45:52Z	partner01	eki-534D3816	eri-9CEF373F
RESERVATION	r-DAFE3FFC	264471547257	default-a
INSTANCE	i-F4BB4471	emi-2C27388C	euca-173-205-188-81.eucalyptus.partner.eucalyptus.com	euca-10-9-180-19.eucalyptus.internal	running	jds-admin2	0		m1.large	2012-05-21T16:35:09Z	partner01	eki-534D3816	eri-9CEF373F