resolvetest

Documentation

Overview

resolvetest simply resolves a hostname at an increasing time interval to observe the diversity in DNS lookup addresses for the host.

This quick experiment is motivated by the S3 performance guide, which recommends using multiple clients with different remote IPs:

Finally, it’s worth paying attention to DNS and double-checking that
requests are being spread over a wide pool of Amazon S3 IP addresses. DNS
queries for Amazon S3 cycle through a large list of IP endpoints. But
caching resolvers or application code that reuses a single IP address do
not benefit from address diversity and the load balancing that follows from it.

http://web.archive.org/web/20200624062712/https://docs.aws.amazon.com/AmazonS3/latest/dev/optimizing-performance-design-patterns.html