How to use holer to access the local area network Linux system from the external network?

linux system is installed on the host in the local area network, which can only be logged in and used by ssh in the local area network. How to use holer to access the host of the Linux system in the internal network from the external network?
https://github.com/wisdom-pro.

Nov.13,2021
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-64f5-1e46a43-44be3.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
MySQL Errno : 1021
Message : Disk full (/tmp/#sql-temptable-64f5-1e46a43-44be3.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
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