How to use keepalived to achieve high availability of multiple services?

there are two servers, and the following software is installed at the same time:
1.mysql
2.nginx
3.keepalived

Q: how to achieve high availability of mysql and nginx respectively through keepalived?

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-64f5-1b35156-e4b5.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
MySQL Errno : 1021
Message : Disk full (/tmp/#sql-temptable-64f5-1b35156-e4b5.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
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