如何通过检查实例名称中的字符串来过滤实例

Question

I am writing a python script to retrieve a list of instances that were incorrectly tagged. I need to filter by checked if a specific string exists in the name.

What is the best way to do this?

I was going to use describe_instances and use the tag filter (where the key is 'Name') but that filter requires that I provide the full value of the tag (ie the instance name) but I need to be able to search using a subset of the name.

Can this be done using the client?

Answer 1

The easiest method is to call describe_instances() without a filter, then just loop through the results and perform your own filtering & fixup logic in Python.

General logic would be:

Create EC2 client
Call describe_instances
Loop through results['Reservations']['Instances']:
  Loop through instance['Tags']:
    if Key == 'Name' and "bad-string" in Value:
      Fix tag

If you have more than 1000 instances, you'll have to re-call describe-instances() with NextToken .

Answer 2

对于正在阅读本文的人，您可以执行John Rotenstein在其答案中建议的操作，或者，也可以在标签名称中使用通配符'*'，因此过滤器将类似于：

filters = [{'Name':'tag:Name', 'Values':['string*']}]