在两台主机中的第二台上重新启动Apache失败

如何解决在两台主机中的第二台上重新启动Apache失败

我在同一域中有两台服务器，一台用于前端，另一台用于后端处理，我创建了一个涵盖两个主机的SSL证书，但是当使用相同过程将证书应用于两个服务器时，我可以得到 apache 作为前端，但后端失败。

操作系统为 Centos 7 ，我附上以下httpd / error_log，因为 apachectl configtest 不会返回任何致命错误。自从出现初始错误以来，我已经添加了index.html。

[Thu Aug 13 19:07:38.798130 2020] [autoindex:error] [pid 29808] [client 97.102.226.107:59831] AH01276: Cannot serve directory /var/www/html/: No matching DirectoryIndex (index.html) found,and server-generated directory index forbidden by Options directive
[Thu Aug 13 19:07:51.498014 2020] [mpm_prefork:notice] [pid 29794] AH00170: caught SIGWINCH,shutting down gracefully
[Thu Aug 13 19:07:52.553808 2020] [core:notice] [pid 29903] SELinux policy enabled; httpd running as context system_u:system_r:httpd_t:s0
[Thu Aug 13 19:07:52.554821 2020] [suexec:notice] [pid 29903] AH01232: suEXEC mechanism enabled (wrapper: /usr/sbin/suexec)
AH00558: httpd: Could not reliably determine the server's fully qualified domain name,using ::1. Set the 'ServerName' directive globally to suppress this message
[Thu Aug 13 19:07:52.570568 2020] [lbmethod_heartbeat:notice] [pid 29903] AH02282: No slotmem from mod_heartmonitor
[Thu Aug 13 19:07:52.573073 2020] [mpm_prefork:notice] [pid 29903] AH00163: Apache/2.4.6 (CentOS) configured -- resuming normal operations
[Thu Aug 13 19:07:52.573101 2020] [core:notice] [pid 29903] AH00094: Command line: '/usr/sbin/httpd -D FOREGROUND'
[Thu Aug 13 19:08:16.102639 2020] [mpm_prefork:notice] [pid 29903] AH00170: caught SIGWINCH,shutting down gracefully
[Thu Aug 13 19:08:17.159400 2020] [core:notice] [pid 29925] SELinux policy enabled; httpd running as context system_u:system_r:httpd_t:s0
[Thu Aug 13 19:08:17.160657 2020] [suexec:notice] [pid 29925] AH01232: suEXEC mechanism enabled (wrapper: /usr/sbin/suexec)
AH00558: httpd: Could not reliably determine the server's fully qualified domain name,using ::1. Set the 'ServerName' directive globally to suppress this message
[Thu Aug 13 19:08:17.178648 2020] [lbmethod_heartbeat:notice] [pid 29925] AH02282: No slotmem from mod_heartmonitor
[Thu Aug 13 19:08:17.181816 2020] [mpm_prefork:notice] [pid 29925] AH00163: Apache/2.4.6 (CentOS) configured -- resuming normal operations