On a service Jenkins restart the /var/log/messages gives me
Sep 19 06:48:51 ftdcslbinf523 systemd: Starting LSB: Jenkins Continuous Integration Server...
Sep 19 06:48:52 ftdcslbinf523 jenkins: Starting Jenkins [  OK  ]
Sep 19 06:48:52 ftdcslbinf523 systemd: Started LSB: Jenkins Continuous Integration Server.
Sep 19 06:50:01 ftdcslbinf523 systemd: Created slice user-0.slice.
Sep 19 06:50:01 ftdcslbinf523 systemd: Starting user-0.slice.
Sep 19 06:50:01 ftdcslbinf523 systemd: Started Session 5 of user root.
Sep 19 06:50:01 ftdcslbinf523 systemd: Starting Session 5 of user root.
Sep 19 06:50:01 ftdcslbinf523 systemd: Removed slice user-0.slice.
Sep 19 06:50:01 ftdcslbinf523 systemd: Stopping user-0.slice.
Sep 19 06:51:54 ftdcslbinf523 systemd: Started LSB: Jenkins Continuous Integration Server.
Sep 19 06:57:30 ftdcslbinf523 systemd: Starting Cleanup of Temporary Directories...
Sep 19 06:57:30 ftdcslbinf523 systemd: Started Cleanup of Temporary Directories.
Sep 19 07:00:01 ftdcslbinf523 systemd: Created slice user-0.slice.
Sep 19 07:00:01 ftdcslbinf523 systemd: Starting user-0.slice.
Sep 19 07:00:01 ftdcslbinf523 systemd: Started Session 6 of user root.
Sep 19 07:00:01 ftdcslbinf523 systemd: Starting Session 6 of user root.
Sep 19 07:00:01 ftdcslbinf523 systemd: Removed slice user-0.slice.
Sep 19 07:00:01 ftdcslbinf523 systemd: Stopping user-0.slice.
Sep 19 07:01:01 ftdcslbinf523 systemd: Created slice user-0.slice.
Sep 19 07:01:01 ftdcslbinf523 systemd: Starting user-0.slice.
Sep 19 07:01:01 ftdcslbinf523 systemd: Started Session 7 of user root.
Sep 19 07:01:01 ftdcslbinf523 systemd: Starting Session 7 of user root.
Sep 19 07:01:01 ftdcslbinf523 systemd: Removed slice user-0.slice.
Sep 19 07:01:01 ftdcslbinf523 systemd: Stopping user-0.slice.


Jenkins.log 
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Jenkins initial setup is required. An admin user has been created and a password generated.
Please use the following password to proceed to installation:

f9334d41b3e54a49b925086b83ff812b

This may also be found at: /var/lib/jenkins/secrets/initialAdminPassword

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If I run a service Jenkins stop I get 
Messages:
Sep 19 07:03:56 ftdcslbinf523 systemd: Stopping LSB: Jenkins Continuous Integration Server...
Sep 19 07:03:57 ftdcslbinf523 jenkins: Shutting down Jenkins [  OK  ]
Sep 19 07:03:57 ftdcslbinf523 systemd: Stopped LSB: Jenkins Continuous Integration Server

Jenkins.log

Sep 19, 2016 7:03:56 AM winstone.Logger logInternal
INFO: JVM is terminating. Shutting down Winstone