The php I believe causing the problem to restart the httpd:
● httpd.service - The Apache HTTP Server
Loaded: loaded (/usr/lib/systemd/system/httpd.service; enabled; vendor preset: disabled)
Drop-In: /usr/lib/systemd/system/httpd.service.d
└─openstack-dashboard.conf
Active: failed (Result: exit-code) since Wed 2018-04-11 10:49:50 EDT; 5min ago
Docs: man:httpd(8)
man:apachectl(8)
Process: 11771 ExecStop=/bin/kill -WINCH ${MAINPID} (code=exited, status=1/FAILURE)
Process: 11767 ExecStart=/usr/sbin/httpd $OPTIONS -DFOREGROUND (code=exited, status=1/FAILURE)
Process: 11737 ExecStartPre=/usr/bin/python /usr/share/openstack-dashboard/manage.py compress --force (code=exited, status=0/SUCCESS)
Process: 11722 ExecStartPre=/usr/bin/python /usr/share/openstack-dashboard/manage.py collectstatic --noinput (code=exited, status=0/SUCCESS)
Main PID: 11767 (code=exited, status=1/FAILURE)
Apr 11 10:49:49 nj51ntvsospd python[11737]: Compressing... done
Apr 11 10:49:49 nj51ntvsospd python[11737]: Compressed 8 block(s) from 17 template(s).
Apr 11 10:49:50 nj51ntvsospd httpd[11767]: AH00526: Syntax error on line 31 of /etc/httpd/conf.d/php.conf:
Apr 11 10:49:50 nj51ntvsospd httpd[11767]: Invalid command 'php_value', perhaps misspelled or defined by a module not included in the server configuration
Apr 11 10:49:50 nj51ntvsospd systemd[1]: httpd.service: main process exited, code=exited, status=1/FAILURE
Apr 11 10:49:50 nj51ntvsospd kill[11771]: kill: cannot find process ""
Apr 11 10:49:50 nj51ntvsospd systemd[1]: httpd.service: control process exited, code=exited status=1
Apr 11 10:49:50 nj51ntvsospd systemd[1]: Failed to start The Apache HTTP Server.
Apr 11 10:49:50 nj51ntvsospd systemd[1]: Unit httpd.service entered failed state.
Apr 11 10:49:50 nj51ntvsospd systemd[1]: httpd.service failed.
# Cause the PHP interpreter to handle files with a .php extension.
#
<FilesMatch \.php$>
SetHandler application/x-httpd-php
</FilesMatch>
#
# Allow php to handle Multiviews
#
AddType text/html .php
#
# Add index.php to the list of files that will be served as directory
# indexes.
#
DirectoryIndex index.php
#
# Uncomment the following lines to allow PHP to pretty-print .phps
# files as PHP source code:
#
#<FilesMatch \.phps$>
# SetHandler application/x-httpd-php-source
#</FilesMatch>
#
# Apache specific PHP configuration options
# those can be override in each configured vhost
#
#
#php_value session.save_handler "files"
#php_value session.save_path "/var/lib/php/session"
~
after I commented out then the httpd services works again.