Due to SELinux behavior change in RHEL 8.x, a system that enforces SELinux policy might result in DPOD services failing to start.
The following log records (or similar) might be found in the system log (/var/log/messages):
17:53:19 server1 MonTier[3159]: Starting MonTier in background: /etc/rc.d/init.d/MonTier: line 539: /app/MonTier_start.pid: Permission denied 17:53:19 server1 systemd[1]: Started LSB: This service manages MonTier products on the system. 17:53:19 server1 MonTier[3159]: /etc/rc.d/init.d/MonTier: line 109: /logs/montier_server/montier.init.log: Permission denied 17:53:19 server1 MonTier[3159]: /etc/rc.d/init.d/MonTier: line 110: /logs/montier_server/montier.init.log: Permission denied 17:53:19 server1 MonTier[3159]: /etc/rc.d/init.d/MonTier: line 134: /logs/montier_server/montier.init.log: Permission denied 17:53:19 server1 MonTier[3159]: /etc/rc.d/init.d/MonTier: line 140: /logs/montier_server/montier.init.log: Permission denied 17:53:19 server1 MonTier[3159]: /etc/rc.d/init.d/MonTier_functions: line 270: /bin/su: Permission denied 17:53:19 server1 MonTier[3159]: /etc/rc.d/init.d/MonTier: line 140: /logs/montier_server/montier.init.log: Permission denied 17:53:19 server1 MonTier[3159]: /etc/rc.d/init.d/MonTier_functions: line 270: /bin/su: Permission denied 17:53:19 server1 MonTier[3159]: /etc/rc.d/init.d/MonTier: line 140: /logs/montier_server/montier.init.log: Permission denied 17:53:19 server1 MonTier[3159]: /etc/rc.d/init.d/MonTier_functions: line 270: /bin/su: Permission denied
Consult your RHEL system administrator regarding needed changes in SELinux configuration.
Example of the SELinux behavior change could be found in the following Red Hat tech note.