What's Your System's Uptime?

Keep track of your system's uptime and downtime with the tuptime tool.

Finding your system's uptime is easy if the "beginning" means the last startup; the historical uptime command reports that information. But what happens if by "beginning" you mean the first startup ever of the system? Or the last 365 days? Or the last month?

Is there any way to have an accumulated uptime—or even better, a look at the whole system's life? For example, cars have odometers, and you can see the miles/kilometers since the first day. For computers, a tool was developed exactly for this task: tuptime.

tuptime reports the historical and statistical running and stopped time of your system, keeping track between restarts. Its main goals are:

  • Count system startups.
  • Register the first boot time (since installation).
  • Count intended and accidental shutdowns.
  • Show the uptime and downtime percentage since the first boot time.
  • Show the accumulated system uptime, downtime and total.
  • Show the longest, shortest and average uptime and downtime.
  • Show the current uptime.
  • Print a formatted table or list with most of the previous values.
  • Register used kernels.
  • Create reports since and/or until a given startup or timestamp.
  • Create reports in CSV format.

It works very simply. tuptime falls to the init manager for execution at startup and shutdown, and then into a cron task that launches regular executions in the meantime—there isn't any dæmon to worry about. Internally, it looks at the btime value (available in /proc/stat) and the uptime value (from /proc/uptime), and that's basically it.

The installation process is easy in Debian, Ubuntu and derivative distributions, using their respective package managers, and it should be available in all the official repositories. As prerequisites, it needs Python 3 and the SQLite library, which usually are included in core packages by default.

Once it's available on your system, you can get the information. It has three output formats: the default is a summary, and there also are table and list outputs to print the registered behavior.


Figure 1. Example tuptime Execution after Installation

The first execution reports the time since the system was booted, and the lines are self-explanatory (note that the date format is based on the system's locale settings):

$ tuptime
System startups:    1   since   22:21:49 02/02/18
System shutdowns:   0 ok   -   0 bad
System uptime:      100.0 %   -   40 minutes and 22 seconds
System downtime:    0.0 %   -   0 seconds
System life:        40 minutes and 22 seconds

Largest uptime:     40 minutes and 22 seconds   from
 ↪22:21:49 02/02/18
Shortest uptime:    40 minutes and 22 seconds   from
 ↪22:21:49 02/02/18
Average uptime:     40 minutes and 22 seconds

Largest downtime:    0 seconds
Shortest downtime:   0 seconds
Average downtime:    0 seconds

Current uptime:  40 minutes and 22 seconds   since
 ↪22:21:49 02/02/18

When getting this report from an older system (see below), the information becomes more interesting. Apart from the fact that the counts increase, there also are more facts about the behavior. For example, the System shutdowns line has 11 "bads", reflecting that the shutdown process wasn't executed correctly, maybe due to power failure or system hangs. The percentage of uptime and downtime reflects that this report is from a lightly used system:

$ tuptime
System startups:    688   since   22:21:49 09/10/15
System shutdowns:   676 ok   <-   11 bad
System uptime:      4.6 %   -   40 days, 7 hours, 7 minutes
 ↪and 48 seconds
System downtime:    95.4 %   -   2 years, 105 days, 17 hours,
 ↪19 minutes and 25 seconds
System life:        2 years, 146 days, 0 hours, 27 minutes
 ↪and 13 seconds

Largest uptime:     12 hours, 51 minutes and 48 seconds   from
 ↪09:29:18 02/03/16
Shortest uptime:    5 seconds   from   22:20:54 12/02/17
Average uptime:     1 hour, 24 minutes and 21 seconds

Largest downtime:   23 days, 3 hours, 23 minutes and 30 seconds
 ↪from   13:49:42 04/12/16
Shortest downtime:  8 seconds   from   17:08:00 03/01/17
Average downtime:   1 day, 5 hours, 11 minutes and 44 seconds

Current uptime:     1 hour, 50 minutes and 0 seconds   since
 ↪17:37:32 02/07/18

You can change the report to a table format (-t) used in combination with any other options, in this case, since the last two startups (-S -2):

$ tuptime -t -S -2
687  14:07:36 02/04/18   1 hour, 28 minutes and 22 seconds
 ↪15:35:58 02/04/18   OK   3 days, 2 hours, 1 minute
 ↪and 34 seconds
688  17:37:32 02/07/18   1 hour, 26 minutes and 13 seconds

Or you can change to the list report format (-l) and show the results until the second startup (-U 2):

$ tuptime -l -U 2
Startup:  1  at  22:21:49 09/10/15
Uptime:   50 minutes and 44 seconds
Shutdown: OK  at  23:12:33 09/10/15
Downtime: 13 seconds

Startup:  2  at  23:12:46 09/10/15
Uptime:   1 minute and 2 seconds
Shutdown: OK  at  23:13:48 09/10/15
Downtime: 18 hours, 57 minutes and 18 seconds

tuptime also accepts ranges between specific dates using the tsince and tuntil options. Both need an argument with the epoch date in seconds. Another example is a report from the last 365 days until the present, maybe to check your provider's SLA.

First, get the epoch date of one year ago using the date command:

$ date --date="1 year ago" +%s

Next, pass it under tsince to tuptime:

$ tuptime --tsince 1486490845

Here's an example of a report from the first day to the last day of the previous month in CSV format. Again, use date to get the first and last days as a timestamp and pass both to tuptime:

$ date -d "-1 month 00:00" +%s
$ date -d "this month -1 second 00:00" +%s
$ tuptime --tsince 1514761200 --tuntil 1517439599 --csv

Or you can list all the entries (-l) ordered by the uptime (-o u), instead of the startup number, in reverse order (-r), including the kernel that was running (-k):

$ tuptime -l -o u -r -k

The manual has detailed information for every option and includes some interesting notes about sync date and time that can help in case of problems. For more information see https://github.com/rfrail3/tuptime.git.

Ricardo Fraile has worked as a sysadmin for nearly ten years, and he's been playing around with Linux and FreeBSD since the late 1990s. He will be glad to answer any questions or comments sent to rfraile@rfraile.eu.

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