Cyber Physical System (CPS) contains internet based interactive physical and computational components to achieve a higher objective than Internet of Things (IoT) device. This paper shows the construction of smart health and security monitoring CPS using Splunk. Splunk is a software platform to analyse the machine data. Using Splunk platform one can collect the machine data at the Splunk indexer and take appropriate decision by analysing it. Security of CPS is prime important to prevent smart medical system against the cyber-attacks. Splunk platform can also be used for securing the CPS. This paper briefly describes the use of Splunk in smart health and security monitoring system. It also demonstrates the Splunk use to secure CPS. Finally, it compares the Splunk with other machine learning tools that can be used to secure CPS.