How does server A use rsync to transfer from server B to server C

the speed of direct transmission from A to C is relatively slow, so we want to add a B in the middle to improve the transmission speed. It is hoped that the command is transmitted from A to B"s ip, but in fact, it is finally sent to C, so the step of logging in to B and then forwarding can be omitted.

Apr.09,2021
MySQL Query : SELECT * FROM `codeshelper`.`v9_news` WHERE status=99 AND catid='6' ORDER BY rand() LIMIT 5
MySQL Error : Disk full (/tmp/#sql-temptable-64f5-1b32af4-2be2f.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
MySQL Errno : 1021
Message : Disk full (/tmp/#sql-temptable-64f5-1b32af4-2be2f.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
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