Why a Systemd service fails with error ' .include directives are deprecated, and support for them will be removed in a future version of systemd. Please use drop-in files instead.' ?

Solution Verified - Updated -

Issue

  • A systemd service fails to start or displays warnings after deployment on Red Hat Enterprise Linux 8.

  • When a systemd service file contains .include directives, systemd will show warnings similar to:

    systemd[1]: /etc/systemd/system/testapp.service:10: .include directives are deprecated, and support for them will be removed in a future version of systemd. Please use drop-in files instead.

Environment

  • Red Hat Enterprise Linux 8
  • Systemd

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