How to analyse slow boot in RHEL-7 and later ?

Solution Verified - Updated -

Issue

  • RHEL 7/RHEL 8/RHEL 9/ RHEL 10 is taking long time to boot. How can I find out which services are taking long time to start?

Environment

  • Red Hat Enterprise Linux 7
  • Red Hat Enterprise Linux 8
  • Red Hat Enterprise Linux 9
  • Red Hat Enterprise Linux 10
  • systemd

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