How can I get the value of the EC2 instance tag “Name” with boto?

Question

I'm working from the instance id. I can get the tags, but I can't figure out how filter on both the instance id and the tag "Name" or index in and return the value of the tag called "Name"

I ended up grabbing all tags and iterating over them till I find the one I want, which can't possibly be right.

 tags = conn.get_all_tags({'resource-id': instance_id})
  for tag in tags:
    if 'Name' in tag.name:
      name = tag.value

Answer 1

你确实有更好的方法：

conn.get_all_tags(filters={'tag-key': 'Name', 'resource-id': instance_id})

Answer 2

I think the way you're doing it is fine. You could always wrap it in a function call as an abstraction:

def get_instance_tag(all_tags, tag_name):
  for tag in all_tags:
    if tag_name == tag.name:
      return tag.value

  return None

name = get_instance_tag(conn.get_all_tags({'resource-id': instance_id}), 'Name')

Note that if tag_name == tag.name: is more accurate than if tag_name in tag.name: .