With ec2 python API boto, how to get spot instance_id from SpotInstanceRequest?

Question

When using boto, Amazon aws python API.

ec2_connection.request_spot_instances(...)
# This will return an ResultSet of SpotInstanceRequest

How can I get instance_ids from the SpotInstanceRequest?

UPDATE: I did it this way, after a lot playing and googleing, hope this help:

ec2_connection.get_all_spot_instance_requests(request_ids=[my_spot_request_id, ])

This will return the updated SpotInstanceRequest, when the instance is ready, we can get *instance_id* from it.

Answer 1

I did something similar: check periodically to see if the spot instance request id returned by ec2_connection.request_spot_instances(...) is matched to an instance in the results of conn.get_all_spot_instance_requests(...) :

conn = boto.ec2.connect_to_region(region_name=region_name, aws_access_key_id=aws_access_key_id, aws_secret_access_key=aws_secret_access_key)
req = conn.request_spot_instances(price=MAX_SPOT_BID,instance_type=instance_type,image_id=AMI_ID,availability_zone_group=region_name,key_name=KEY_PAIR_PEM[:-4],security_groups=security_groups)
job_instance_id = None
while job_instance_id == None:
    print "checking job instance id for this spot request"
    job_sir_id = req[0].id # spot instance request = sir, job_ is the relevant aws item for this job
    reqs = conn.get_all_spot_instance_requests()
    for sir in reqs:
        if sir.id == job_sir_id:
            job_instance_id = sir.instance_id
            print "job instance id: " + str(job_instance_id)
            break
    time.sleep(SPINUP_WAIT_TIME)