vim /etc/zabbix/web/zabbix.conf.php
<?php
// Zabbix GUI configuration file.
global $DB;
$DB['TYPE'] = 'MYSQL';
$DB['SERVER'] = '172.16.6.202';
$DB['PORT'] = '3306';
$DB['DATABASE'] = 'zabbix';
$DB['USER'] = 'zabbix';
$DB['PASSWORD'] = '123456';
// Schema name. Used for IBM DB2 and PostgreSQL.
$DB['SCHEMA'] = '';
$ZBX_SERVER = 'localhost';
$ZBX_SERVER_PORT = '10051';
$ZBX_SERVER_NAME = 'zabbix_server_7.5';
$IMAGE_FORMAT_DEFAULT = IMAGE_FORMAT_PNG;