RHEL 7 uses systemd (instead of init) to manage system resources. Run the command
# systemctl enable httpd.service
on casdev-casapp and casdev-samlsp to enable the HTTPD service in systemd. This will cause systemd to start HTTPD at system boot time. Additionally, the following commands may now be used to manually start, stop, restart, and check the status of the HTTPD service:
# systemctl start httpd
# systemctl stop httpd
# systemctl restart httpd
# systemctl status httpd