[CentOS] Power Cut

[Leroy Tennison]

Don't know how much control you have over the remote situation but some UPSes have their own logs which should show this.  Also, some UPSes have add-in boards providing network connections with various services.  If these outages are costing enough money and the remote UPS doesn't have the add-in card but does have the capability of adding one you might be able to justify the expense.

----- Original Message -----
From: "Ted Miller" <centos-user at millert.e4ward.com>
To: centos at centos.org, "Hadi Motamedi" <motamedi24 at gmail.com>
Sent: Tuesday, November 1, 2016 8:00:48 PM
Subject: Re: [CentOS] Power Cut

On 10/30/2016 01:12 AM, Hadi Motamedi wrote:
> Dear All
> I am using a centos server for cdr billing and mediation device on a remote
> network. I am experiencing problem that I am suspicious it comes from main
> supply power cut at the remote site. The power supply to the remote site
> comes from battery charger that will be automatically switched in circuit
> under main supply power cut but cannot provide adequate power for more than
> 2 hours . I am suspicious that the remote system is suffering from many
> frequent main supply power cut . Can you please do me favor and let me know
> if there is any log on my centos server that I can check to see if there
> would be many frequent power cut there ?
> Thank you for your time

I have been experiencing a similar situation with a remote server, and
found it much easier to use the command:
   last -x | tail -n50
to see reboots.  You can tell a power cut because the end time for the
previous boot up will be the same as the begin time for the next boot.  If
it is an orderly shutdown, there will be a time gap that is logged.  As I
understand it, the 'last' command uses the data stored in /var/log/wtmp,
but that information is not in human-readable format.
Ted Miller
Indiana, USA

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