Hello All,
We are using Boot Time Property to identify when server was last rebooted but for few of the Linux server, Boot time is showing incorrect value.
Can you please let me know from exactly Boot time pull the information from the Linux server and how we can avoid the wrong data.
Thanks in Advance!!
Regards,
Manish Singh
Any input on the query please…
Possible boot time of operating system uses the same mechanism as uptime of operating system to calculate the times from /proc/uptime. I’ve seen some cases where the uptime was showing negative numbers but the reason was due to the /proc/uptime maintained by the OS being askew which lead to the uptime reflecting the same skew, so no fault of Bigfix.
You can check /proc/uptime in a more human readable format by using
awk '{printf("%d:%02d:%02d:%02d\n",($1/60/60/24),($1/60/60%24),($1/60%60),($1%60))}' /proc/uptime
This will show the number of days:hours:minutes:seconds that the OS is reporting its been up for which you can then compare with either the boot time or the uptime. If there is a match, it would indicate that the discrepancy is within the OS, although I can’t advise why that would be.
Some examples.
Q: boot time of operating system
A: Thu, 01 Nov 2018 04:06:42 -0600
T: 19333
Q: uptime of operating system
A: 26 days, 01:24:48
T: 7569
Q: lines of file "/proc/uptime"
A: 2251558.08 2050510.19
T: 191
awk '{printf("%d:%02d:%02d:%02d\n",($1/60/60/24),($1/60/60%24),($1/60%60),($1%60))}' /proc/uptime
26:01:24:54
A forum posting related to the same topic - How is uptime calculated for each OS?