RSync: How do I synchronize in both directions?

Question

I want to use rsync to synchronize two directories in both directions.

I refer to synchronization in classical sense (not how it is

Answer 1

I'm using rsync with inotifywait. When you change any file, rsync will be executed.

inotifywait -m --exclude "$_LOG_FILE" -r -e create,delete,delete_self,modify,moved_to --format "%w%f" "$folder"

You need run inotifywait on both host. Please check example inotifywait