By default, Jenkins will kill all the spawned process at the completion of build.
To override this, you need to create environment variable BUILD_ID.
Go to Jenkins-->Manage Jenkins-->Configure System Now under 'Global properties' section, under Environment variables, click on ADD button to add new Environment variable. Give Name= BUILD_ID and value='allow_to_run_as_daemon start_my_service' (without quote). Click on save button. And you are done.
Now the spawn process will continue to execute even after the build got completed.
这个试验后有效。