When httpd was started by apachectl -start, but LLAWP didn't start completely.
Besides that, below error was output in apache error_log.
[Error] SiteMinder Agent
Unable to load SiteMinder host configuration object or host configuration file.
SELinux cause this issue, because below message was output in error_log.
[notice] SELinux policy enabled; httpd running as context unconfined_u:system_r:httpd_t:s0
Change SELINUX status from "enforcing" to "disabled".