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

Solution Verified - Updated June 27 2025 at 6:33 AM - English Environment Red Hat Enterprise Linux 7 Red Hat Enterprise Linux 8 Red Hat Enterprise Linux 9 Red Hat Enterprise Linux 10 systemd 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? Resolution The systemd-analyze command can be utilised to find out information about how much each service took to start. Check Diagnostics Steps for examples. Diagnostic Steps The systemd-analyze time provides overall information about the time taken system to start. Raw [root@server ~]# systemd-analyze time Startup finished in 629ms (kernel) + 930ms (initrd) + 6.098s (userspace) = 7.658s The systemd-analyze blame command identifies the time taken by a particular unit to start. Raw [root@server ~]# systemd-analyze blame 4.048s network.service 1.298s firewalld.service 1.071s kdump.service 824ms tuned.service 592ms lvm2-pvscan@252:2.service 555ms postfix.service 522ms lvm2-monitor.service 257ms boot.mount 203ms systemd-logind.service 125ms rhel-dmesg.service … At certain steps, the boot cannot proceed until all dependencies for the unit are satisfied. To view units at these critical point execute systemd-analyze critical-chain Raw [root@servert ~]# systemd-analyze critical-chain The time after the unit is active or started is printed after the “@” character. The time the unit takes to start is printed after the “+” character.

multi-user.target @6.089s └─postfix.service @5.018s +555ms └─network.target @5.015s └─network.service @961ms +4.048s └─basic.target @960ms └─paths.target @959ms └─brandbot.path @959ms └─sysinit.target @954ms └─systemd-update-utmp.service @946ms +7ms └─auditd.service @896ms +48ms └─systemd-tmpfiles-setup.service @865ms +27ms └─rhel-import-state.service @816ms +45ms └─local-fs.target @813ms └─lvm2-monitor.service @288ms +522ms └─lvm2-lvmetad.service @330ms └─lvm2-lvmetad.socket @287ms └─-.mount └─system.slice └─-.slice Product(s) Red Hat Enterprise LinuxComponent systemdCategory TroubleshootTags performance rhel rhel_10 rhel_7 rhel_8 rhel_9 systemd troubleshooting This solution is part of Red Hat’s fast-track publication program, providing a huge library of solutions that Red Hat engineers have created while supporting our customers. To give you the knowledge you need the instant it becomes available, these articles may be presented in a raw and unedited form.