Both belongs to boto.ec2 . From the documentation i found that get_all_reserved_instances returns all reserved instances, but i am not clear about get_all_reserved_instances_offerings . What is it mean by offering.
One other thing that i want to know is,what is recurring_charges ?
Please clarify ?
The get_all_reserved_instance_offerings method in boto returns a list of all reserved instance types that are available for purchase.  So, if you want to purchase reserved instances you would look through the list of offerings, find the instance type, etc. that you want and then you would be able to purchase that offering with the purchase_reserved_instance_offering method or via the AWS console.
So, perhaps a simple way to say it is get_all_reserved_instance_offerings tells you what you can buy and get_all_reserved_instances tells you what you have already bought.
What is the difference between get_all_reserved_instances and get_all_reserved_instances_offerings?