Re: Container Uptime Discussion

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On 2/9/24 4:51 AM, Craig Small (csmall) wrote:
> . . . 
> So, do I do any fancy stuff or just make the container uptime is PID1 
> start - clock_gettime?

Hi Craig,

Don't do anything fancy because what you've got now works just fine 
under both docker and lxc (besides, the above is backwards).  Using the 
C standard clock_gettime equalized things and was the perfect solution.

Here's a summary of what I found with uptime outputs:

                   docker     lxc *      lxc *
based             ubuntu     ubuntu     opensuse
                   ---------  ---------  ---------
your uptime       host       container  container
your uptime -c    container  container  container
provided uptime   host       container  host
provided version  3.3.17     4.0.4      coreutils 9.4

  * a reminder that lxc alters /proc/uptime but
    coreutils uptime doesn't exploit

> Perhaps boot_time in the library should use clock_gettime()?

The attached patch does just that.  Thanks for paving the way.

> If you could run the test program attached, or something like it I'd be 
> keen to see if it provides the system uptime.
> I'll make the changes to use the clock.

I ran it under the three above containers.  It always shows the host 
"uptime".  Do you plan to abandon all use of /proc/uptime?

Anyway, thanks in advance for the push.

Regards,

Jim

p.s. over the weekend I'll decide whether or not to make top's 'l' 
toggle a three-way switch to also show container uptime.
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