Systemd

remove service

systemctl stop [servicename]
systemctl disable [servicename]
rm /etc/systemd/system/[servicename]
rm /etc/systemd/system/[servicename] # and symlinks that might be related
rm /usr/lib/systemd/system/[servicename] 
rm /usr/lib/systemd/system/[servicename] # and symlinks that might be related
systemctl daemon-reload
systemctl reset-failed

example service for confluence

/etc/systemd/system/confluence.service


[Unit]
Description=Atlassian Confluence Service
After=syslog.target network.target

[Service]
Type=forking
User=confluence
Group=confluence
ExecStart=/opt/confluence/740-install/bin/start-confluence.sh
ExecStop=/opt/confluence/740-install/bin/stop-confluence.sh
Environment="JAVA_HOME=/lib/jvm/jre-11"
Environment="CATALINA_OPTS=-XX:MetaspaceSize=512m -XX:MaxMetaspaceSize=512m"
[Install]
WantedBy=multi-user.target