Description of problem:


The Red Hat Openstack Platform 13 Directors Installation and Usage Guide[0] contains what I suspect are deprecated troubleshooting functions regarding restarting the Heat API in the Director Troubleshooting/Tuning the Undercloud section [0].

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Chapter 13
Section 13.8
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Section content: 
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The openstack-heat-engine and openstack-heat-api services might consume too many resources at times. If so, set max_resources_per_stack=-1 in /etc/heat/heat.conf and restart the heat services:

$ sudo systemctl restart openstack-heat-engine openstack-heat-api
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Issue: 
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In Red Hat Openstack 13 the heat-api service is configured as a WSGI application under the control of Apache. Restarting the openstack-heat-api service as instructed by the troubleshooting guide will cause issues with port conflicts as it attempts to bound to port 8004 which is already bound by the apache/wsgi interface of the openstack-heat-api and will not yield the desired results.
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[0]
https://access.redhat.com/documentation/en-us/red_hat_openstack_platform/13/html/director_installation_and_usage/chap-troubleshooting_director_issues#sect-Tuning_the_Undercloud