How to tell how long last reboot took

anon091 · 04-20-2010, 07:49 AM

Is there certain lines I could look through in a certain log file to give me a rough estimate of how long the last, or last couple, reboots of a server took?

ncsuapex · 04-20-2010, 08:12 AM

I'd say check out /var/log/messages and see and look for the time you think it was rebooted and go from there

PMP · 04-20-2010, 08:45 AM

Linux command w will show you the details

or

cat /proc/uptime

ncsuapex · 04-20-2010, 09:05 AM

^ I think he wants to know how long the actual reboot took.... Not how long the server has been up.

anon091 · 04-20-2010, 09:08 AM

Correct, I want to know how long the server is down for while it reboots, on average, or at least the last time.

The problem is is that I dont know when the last time it was rebooted. Can i just grep for certain phrases, then subtract the time stamps to give me the time?

anon091 · 04-20-2010, 09:59 AM

I just looked on the server, its been up for almost 100 days, but my messages files only go back to March, and that ones only 15k :-(

Can anyone think of another way to figure this out?

no2498 · 04-20-2010, 12:24 PM

? does it not start deleting cache files after it fills up
may be why your log is short

hope this helps

anon091 · 04-20-2010, 12:28 PM

yeah, it overwrites them as time goes by, not sure why they are so small though.

chrism01 · 04-20-2010, 07:18 PM

The settings for the num of logfiles preserved is in the logrotate configs

logrotate.conf
logrotate.d

elaguilas · 04-20-2010, 07:32 PM

is good

anon091 · 04-21-2010, 05:25 AM

it looks like i'm keeping 4 files, but i dont know why these ones are so small.