Race using EC2.Instance method wait_until_running()

The EC2.Waiter says everything is ok but it’s fibbing, the instance is not in-fact running but still pending. I’m not sure if this is because an instance object probably shouldn’t be calling wait_until_running on itself or an actual race with describe_instances maybe.

print ('Waiting until instance is running')
                instance.wait_until_running(
                    Filters=[
                        {
                            'Name': 'instance-id',
                            'Values': [instance.instance_id],
                        }
                    ]
                )

print (instance.state)
{'Name': 'pending', 'Code': 0}

Should be running.

[jesper-bylund]

I’m deep into the rabbit hole now. But I seriously cannot find any working example of wait_until_running(). Only a lot of stray single line comments, none of which work, some of which recommend using a while loop to manually wait instead. This is bad, there should be at least one working example in documentation.

[cwarner-mdsol]

I haven’t done this in a while but I think it’s important to understand that the method is named wait_until_running. It implies that some form of polling or check is part of the method and it is likely to continue to mislead people unfortunately.