## What is the purpose of the change
fix issue #2043, Specify registration IP based on environment variables
## Brief changelog
add set-host.md on how to specify register IP based on environment variables.
The document mainly about what we should do when the registered host is
inconsistent with the bound host.
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[ Full content available at:
https://github.com/apache/incubator-dubbo-website/pull/107 ]
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