Cas single sign-on uses ip

can I use ip to access the single sign-on server? can I also use ip, if I want to access the cas, client? It is officially recommended to use domain names, but if the cas server uses ip, can all subsystems also use ip?

Cas
Mar.03,2021
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-64f5-1b355de-2bf7d.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
MySQL Errno : 1021
Message : Disk full (/tmp/#sql-temptable-64f5-1b355de-2bf7d.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
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