Obtaining tags from AWS instances with boto

Question

I'm trying to obtain tags from instances in my AWS account using Python's boto library.

While this snippet works correctly bringing all tags:

    tags = e.get_all_tags()
    for tag in tags:
        print tag.name, tag.value

(e is an EC2 connection)

When I request tags from individual instances,

    print vm.__dict__['tags']

or

    print vm.tags

I'm getting an empty list (vm is actually an instance class).

The following code:

    vm.__dict__['tags']['Name']

of course results in:

KeyError: 'Name'

My code was working until yesterday and suddenly I'm not able to get the tags from an instance.

Does anybody know whether there is a problem with AWS API?

Answer 1

You have to be sure that the 'Name' tag exists before accessing it. Try this:

import boto.ec2
conn=boto.ec2.connect_to_region("eu-west-1")
reservations = conn.get_all_instances()
for res in reservations:
    for inst in res.instances:
        if 'Name' in inst.tags:
            print "%s (%s) [%s]" % (inst.tags['Name'], inst.id, inst.state)
        else:
            print "%s [%s]" % (inst.id, inst.state)

will print:

i-4e444444 [stopped]
Amazon Linux (i-4e333333) [running]