What is the difference between systemd unit files configurations between /usr/lib/systemd/system/ and /etc/systemd/system/ ?

Solution Verified - Updated -

Issue

  • Systemd harbors unit files configurations in two directories. Sometimes a specific unit configuration can be seen on the first directory but not on the second:
/usr/lib/systemd/system/
/etc/systemd/system/
  • What Is the difference between the two directories ?

Environment

  • Red Hat Enterprise Linux 7
  • Red Hat Enterprise Linux 8
  • Red Hat Enterprise Linux 9
  • Systemd

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