I Installed Wildfly 15 final version on Redhat 7.6 version, followed these step which is mentioned in this link
cp /opt/wildfly/docs/contrib/scripts/init.d/wildfly.conf /etc/default
cp /opt/wildfly/docs/contrib/scripts/init.d/wildfly-init-redhat.sh /etc/init.d/wildfly
change the ownership to wildfly user. Using chkconfig utility perfomed chkconfig --add wildfly ,chkconfig --level 2345 wildfly on.
sudo service wildfly start // starting OK sudo service wildfly stop // stoping server Ok
When rebooting the system, it's not starting the server. Don't know where is the problem.