A traditional summary (not executive summary) covers what you have written in your thesis. It should comprehend the heads and the subdivisions of your work. If put together smartly, it should be an easy-to-read rendition of your table of contents. You should be able to back-engineer your table of contents from your summary.
An abstract is intended to ease the reader into reading your stuff. It is a comprehensive restatement of the substantive points of your work.
It should
-say why you did what you did
-include the essential details
-describe results and draw conclusions
-list recommendations, if applicable, to further work in this subject.
An abstract is no place for background information, comparisons with other works, opinions, illustrative examples, etc.
To see a typical abstract, read any patent or any patent disclosure; they always start with an abstract, never with a summary.
Name your piece accordingly.