Systemd Service Fails To Start With 'Refusing to accept PID outside of service control group, acquired through unsafe symlink chain' Error.

Solution Unverified - Updated -

Issue

  • A customer-made systemd service, that use to work under RHEL 7.6 and below, now fails when started in RHEL 7.7.

Environment

  • Red Hat Enterprise Linux 7.7 (RHEL 7.7)

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