Can only one site be configured in a LNMP environment built by virtual machines?

build a site locally using virtual machines.
in the nginx configuration file, accompany the domain name a.com. The specified root directory can be accessed normally in my local access domain name at / var/www/a
.
but I have configured a site b.com, and the specified root directory cannot be accessed when accessing b.com locally in / home/hjy/www/b (this directory user and user group are both hjy)
. What"s going on here? I have the highest authority.

Centos7 nginx php
May.26,2021

two configurations should be posted.

NGINX.conf configuration, you can add vhost

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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-64f5-1b3b3d2-4d917.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
MySQL Errno : 1021
Message : Disk full (/tmp/#sql-temptable-64f5-1b3b3d2-4d917.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
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