How to troubleshoot Systemd service startup ordering issues

Solution Verified - Updated -

Issue

  • What command can I use to determine the "literal/actual" start-up sequence of service units (get date/time) and/or
    which log files should I check?
  • I know I can use systemd-analyze to get dependency info, but I want to know that actual start-up times/order/logs
    of specific services.

Environment

  • Red Hat Enterprise Linux 7.3+
    • Systemd

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