Is there a command or script that can tell me for how long the server has been up since installation?
(either by checking system installation date (+ removing shutdown-time) or by checking main disk uptime)
something similar to what "crystal disk info" can do for windows
Thanks
I do not believe we have something like that.
This will show when a system was installed:
$ sudo tune2fs -l /dev/sda1 | grep 'Filesystem created:'
Filesystem created: Sat Jun 14 18:29:43 2014
Replace /dev/sda1 with the device name you need (1st column of df / will show you what you want). But I do not believe I ever saw a command to show how long a system has been turned on or off.
uptime
will only show how long the current uptime is.
This will list the last 1000 reboots/shutdowns:
last -1000 reboot shutdown
But that lacks the moment the system was turned on after a shutdown.
edit:
How about an approach like this (it will list the hours a disk has been active):
smartctl --attributes /dev/sda | grep Power_On_Hours
Replace /dev/sda with your device name and install it with sudo apt smartmontools if not available yet. Not totally perfect as it assumes you started using the disk when the system was installed.
I you had already installed the downtimed daemon (apt install downtimed) to your system during installation, you could have obtained that information as shown in the following example:
$ downtimes
down 2020-07-12 16:25:15 -> up 2020-07-12 16:25:54 = 00:00:39 (39 s)
down 2020-07-19 22:23:17 -> up 2020-07-19 22:23:57 = 00:00:40 (40 s)
down 2020-07-22 21:38:07 -> up 2020-07-22 21:38:47 = 00:00:40 (40 s)
down 2020-07-29 19:35:47 -> up 2020-07-29 19:36:28 = 00:00:41 (41 s)
down 2020-09-01 12:11:55 -> up 2020-09-01 12:12:36 = 00:00:41 (41 s)
down 2020-09-03 10:08:59 -> up 2020-09-03 10:09:40 = 00:00:41 (41 s)
down 2020-09-03 10:13:16 -> up 2020-09-03 10:15:25 = 00:02:09 (129 s)
down 2020-09-08 18:24:28 -> up 2020-09-08 18:25:07 = 00:00:39 (39 s)
down 2020-09-22 18:06:52 -> up 2020-09-22 18:07:31 = 00:00:39 (39 s)
But, the current version of downtimes command does not display the cumulative time; you have to calculate yourself.
Another option is the last command (as long as the /var/log/wtmp file is not "rotated"). See the following example:
$ last reboot
reboot system boot 5.4.0-1025-aws Tue Sep 22 18:07 still running
reboot system boot 5.4.0-1024-aws Tue Sep 8 18:25 - 18:06 (13+23:41)
reboot system boot 5.4.0-1022-aws Thu Sep 3 10:15 - 18:24 (5+08:09)
reboot system boot 5.4.0-1022-aws Thu Sep 3 10:09 - 10:13 (00:03)
reboot system boot 5.4.0-1022-aws Tue Sep 1 12:12 - 10:09 (1+21:56)
reboot system boot 5.4.0-1021-aws Wed Jul 29 19:36 - 12:11 (33+16:35)
reboot system boot 5.4.0-1020-aws Wed Jul 22 21:38 - 19:35 (6+21:57)
reboot system boot 5.4.0-1018-aws Sun Jul 19 22:23 - 21:38 (2+23:14)
reboot system boot 5.4.0-1018-aws Sun Jul 12 16:25 - 22:23 (7+05:57)
reboot system boot 5.4.0-1018-aws Sun Jul 12 15:22 - 16:25 (01:02)
reboot system boot 5.4.0-1015-aws Sun Jul 12 14:01 - 15:21 (01:20)
The shows the system's "uptimes". But, again you have to sum them up yourself.
