Centos 7 | Create Linux service task manually
Create following file with similar content.
Change the description and point to the correct Exec Start.
/etc/systemd/system/splunk-server.service
[Unit]
Description=SPLUNK Server
[Service]
Type=forking
ExecStart=/opt/splunk/bin/splunk start
RemainAfterExit=yes
[Install]
WantedBy=multi-user.target