Using boto to assign elastic ip to instance

[Deependra]

Hi all,

Just started using boto. Had a small doubt.

I have couple of Windows instances on EC2 which I would like to start/
stop via a python script. After the instance has started I would like
to associate a specific elastic ip to each one of them. If I have 3
instance suppose each with a elastic ip:

i-xxxxxx 51.x.x.x
i-yyyyyy 51.x.x.y
i-zzzzzz 51.x.x.z

How do I make sure that these instances get the same IP when they
start back?

I heard about something call Tagging a instance in EC2 not sure if
that is possible via boto.

Regards
Deependra

[Matt Billenstein]

See the docs on the connection object:

http://boto.s3.amazonaws.com/ref/ec2.html#module-boto.ec2.connection

I would basically do:

conn = boto.ec2.connect_to_region(
region_name = 'REGION_NAME',
aws_access_key_id = 'ACCESS_KEY',
aws_secret_access_key = 'SECRET_ACCESS_KEY',
)

ip_to_inst_map = {
'51.x.x.x' : 'i-xxxxxx',
'51.x.x.y' : 'i-yyyyyy',
'51.x.x.z' : 'i-zzzzzz',
}

for a in conn.get_all_addresses():
inst_id = ip_to_inst_map.get(a.public_ip)
if inst_id and a.instance_id != inst_id:
success = a.associate(inst_id)
if not success:
print "Failed to associate ip %s to inst %s" % (a.public_ip,
inst_id)

Although it appears you can just call:

conn.associate_address(instance_id, public_ip)

and if the address is already associated with that instance I'd expect
it to do nothing...

m

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