为什么该服务器的负载平衡不起作用？

Question

我正在尝试使用 Apache 和反向代理模式设置负载平衡。但我遇到了一些问题。尝试配置时，响应了 HTTP 403 错误。这是我正在尝试的配置：

Listen 9104

<Location "/balancer-manager">
    SetHandler balancer-manager
    Allow from all
</Location>

<VirtualHost *:9104>

    DocumentRoot /var/www/html/
    ServerName appempmam.desabpd.popular.local
    <Proxy balancer://mycluster>
        BalancerMember "http://10.15.5.152:9100/"  route=1
        #BalancerMember "http://0.0.0.0:8081/"  route=2
        ProxySet lbmethod=byrequests
    
    </Proxy>

    
    
    ProxyPreserveHost On
    ProxyPass / balancer://mycluster/
    ProxyPassReverse / balancer://mycluster/

    ErrorLog /var/log/httpd/proxy-error.log
    CustomLog /var/log/httpd/proxy-access.log combined

</VirtualHost>

如果我用实际的后端服务器而不是集群名称替换proxypass和proxypassreverse条目，那么它就可以正常工作，请求也会得到正确的响应，但是当使用负载平衡时，它就不起作用了。我在日志中搜索了任何类型的错误，但什么也没找到。我需要平衡才能正常工作，因为不久的将来会添加另一台服务器。我这里漏掉了什么吗？

我正在使用 Apache 2.4 和 Red Hat 8.1。

顺便说一句，这是主配置文件中的目录权限条目：

<Directory "/var/www">
    AllowOverride None
    # Allow open access:
    Require all granted
</Directory>

# Further relax access to the default document root:
<Directory "/var/www/html">
    #
    # Possible values for the Options directive are "None", "All",
    # or any combination of:
    #   Indexes Includes FollowSymLinks SymLinksifOwnerMatch ExecCGI MultiViews
    #
    # Note that "MultiViews" must be named *explicitly* --- "Options All"
    # doesn't give it to you.
    #
    # The Options directive is both complicated and important.  Please see
    # http://httpd.apache.org/docs/2.4/mod/core.html#options
    # for more information.
    #
    Options Indexes FollowSymLinks

    #
    # AllowOverride controls what directives may be placed in .htaccess files.
    # It can be "All", "None", or any combination of the keywords:
    #   Options FileInfo AuthConfig Limit
    #
    AllowOverride None

    #
    # Controls who can get stuff from this server.
    #
#    Require all granted
</Directory>