Please explain my version of output:
last reboot -F
reboot system boot 3.10.0-514.26.2. Wed Oct 2 10:45:54 2019 - Thu Oct 3 12:55:56 2019 (1+02:10)
reboot system boot 3.10.0-514.26.2. Wed May 23 14:35:36 2018 - Thu Oct 3 12:55:56 2019 (497+22:20)
reboot system boot 3.10.0-514.26.2. Fri Sep 1 08:54:49 2017 - Wed May 23 14:34:51 2018 (264+05:40)
reboot system boot 3.10.0-514.21.1. Mon Aug 28 12:21:25 2017 - Wed May 23 14:34:51 2018 (268+02:13)
reboot system boot 3.10.0-514.21.1. Mon Aug 28 12:06:25 2017 - Mon Aug 28 12:21:11 2017 (00:14)
reboot system boot 3.10.0-514.21.1. Mon Aug 28 12:05:54 2017 - Mon Aug 28 12:06:06 2017 (00:00)
reboot system boot 3.10.0-514.21.1. Fri Jun 23 08:46:34 2017 - Fri Jun 23 08:48:02 2017 (00:01)
reboot system boot 3.10.0-514.21.1. Tue Jun 20 17:19:13 2017 - Fri Jun 23 08:48:02 2017 (2+15:28)
reboot system boot 3.10.0-514.el7.x Tue Jun 20 16:54:11 2017 - Tue Jun 20 17:19:00 2017 (00:24)
What these strings mean?
reboot system boot 3.10.0-514.26.2. Fri Sep 1 08:54:49 2017 - Wed May 23 14:34:51 2018 (264+05:40)
reboot system boot 3.10.0-514.21.1. Mon Aug 28 12:21:25 2017 - Wed May 23 14:34:51 2018 (268+02:13)
System booted on Mon Aug 28 2017 at 12:21:25 with kernel 3.10.0-514.21.1? Ok, suppose. But what happened on Fri Sep 1 2017 at 08:54:49 2017? Someone loaded another kernel 3.10.0-514.26.2.? But there was no reboot... please explain.
PS Well, now I am not understanding at all
# last reboot -F
reboot system boot 3.10.0-514.26.2. Wed Oct 2 10:45:54 2019 - Thu Oct 3 14:50:55 2019 (1+04:05)
reboot system boot 3.10.0-514.26.2. Wed May 23 14:35:36 2018 - Thu Oct 3 14:50:55 2019 (498+00:15)
after 15 mins
# last reboot -F
reboot system boot 3.10.0-514.26.2. Wed Oct 2 10:45:54 2019 - Thu Oct 3 15:06:29 2019 (1+04:20)
reboot system boot 3.10.0-514.26.2. Wed May 23 14:35:36 2018 - Thu Oct 3 15:06:29 2019 (498+00:30)
Why string #2 changed? Server was rebooted by reset button last time (Oct 2)