Send dhcp-users mailing list submissions to
dhcp-users@lists.isc.org
To subscribe or unsubscribe via the World Wide Web, visit
https://lists.isc.org/mailman/listinfo/dhcp-users
or, via email, send a message with subject or body 'help' to
dhcp-users-requ...@lists.isc.org
You can reach the person managing the list at
dhcp-users-ow...@lists.isc.org
When replying, please edit your Subject line so it is more specific
than "Re: Contents of dhcp-users digest..."
Today's Topics:
1. Re: DHCP restart with bulk lease data (Surya Teja)
2. Re: DHCP restart with bulk lease data (sth...@nethelp.no)
3. Re: DHCP restart with bulk lease data (Sten Carlsen)
----------------------------------------------------------------------
Message: 1
Date: Tue, 29 Oct 2019 15:29:25 +0530
From: Surya Teja <suryateja...@gmail.com>
To: Users of ISC DHCP <dhcp-users@lists.isc.org>
Subject: Re: DHCP restart with bulk lease data
Message-ID:
<CA+0Ac3ybpZ4UabgiNk=T5AcGnNNcKjAj5Fa6Q0CsWu=vlgk...@mail.gmail.com>
Content-Type: text/plain; charset="utf-8"
Hi, I am not familiar with c code(source code) but I will try to go
through,
The main thing I am facing the issue is when the data is too high like
50-60k leases in the file, the dhcpd service restart is taking more time
(nearly 5-6 minutes) some times nearly 10-11 mins, At these duration the
network area will be like blackout, no user can connect to network
which is making me panic to perform restarts (I am doing the restarts
because If the config is changed like any new statement added then we need
to stop and start the dhcpd to get the new changes work)
I am suspecting writing the data into lease file is taking time (not
sure)
Do we have any suggested techniques which can reduce the time taken by the
service to up, or any parameter which controls the behavior of lease file
writing
Thanks
Teja
On Tue, Oct 29, 2019 at 9:00 AM <glenn.satch...@uniq.com.au> wrote:
> On 2019-10-29 07:31, Simon Hobson wrote:
> > Surya Teja <suryateja...@gmail.com> wrote:
> >
> >> will it generates the multiple backup files when the data is too big?
> >> like dhcpd.lease ----> org file
> >> dhcpd.leases~ -----> backup1
> >> dhcpd.leases.<time_stamp> ----> backup2
> >
> > No. The server writes out a new file, renames the existing one
> > (deleting the old backup in the process), then renames the new one
> > into place.
>
> Hi Surya,
>
> Maybe you need to look at the source code to see the conditions under
> which this file is created?
>
> regards,
> -glenn
> _______________________________________________
> dhcp-users mailing list
> dhcp-users@lists.isc.org
> https://lists.isc.org/mailman/listinfo/dhcp-users
>
-------------- next part --------------
An HTML attachment was scrubbed...
URL:
<https://lists.isc.org/pipermail/dhcp-users/attachments/20191029/0acebd8d/attachment-0001.htm>
------------------------------
Message: 2
Date: Tue, 29 Oct 2019 11:20:41 +0100 (CET)
From: sth...@nethelp.no
To: dhcp-users@lists.isc.org, suryateja...@gmail.com
Subject: Re: DHCP restart with bulk lease data
Message-ID: <20191029.112041.79053316.sth...@nethelp.no>
Content-Type: Text/Plain; charset=us-ascii
> The main thing I am facing the issue is when the data is too high like
> 50-60k leases in the file, the dhcpd service restart is taking more time
> (nearly 5-6 minutes) some times nearly 10-11 mins
If a dhcpd restart with 50 - 60k leases takes 5-6 minutes or more,
you're doing something wrong. With a decent disk subsystem this is
expected to take a few *seconds* (5 - 10 seconds would be my estimate
based on what we see here with a larger leases file).
Steinar Haug, Nethelp consulting, sth...@nethelp.no
------------------------------
Message: 3
Date: Tue, 29 Oct 2019 12:43:42 +0100
From: Sten Carlsen <st...@s-carlsen.dk>
To: Users of ISC DHCP <dhcp-users@lists.isc.org>
Subject: Re: DHCP restart with bulk lease data
Message-ID: <4d5505c1-e0f7-48c8-b366-979e282cf...@s-carlsen.dk>
Content-Type: text/plain; charset=us-ascii
> On 29 Oct 2019, at 11.20, sth...@nethelp.no wrote:
>
>> The main thing I am facing the issue is when the data is too high like
>> 50-60k leases in the file, the dhcpd service restart is taking more time
>> (nearly 5-6 minutes) some times nearly 10-11 mins
>
> If a dhcpd restart with 50 - 60k leases takes 5-6 minutes or more,
> you're doing something wrong. With a decent disk subsystem this is
> expected to take a few *seconds* (5 - 10 seconds would be my estimate
> based on what we see here with a larger leases file).
Could there be issues with file permissions?
My guess is that the temporary file written can not be renamed because dhcpd
does not have write permissions?
>
> Steinar Haug, Nethelp consulting, sth...@nethelp.no
> _______________________________________________
> dhcp-users mailing list
> dhcp-users@lists.isc.org
> https://lists.isc.org/mailman/listinfo/dhcp-users
------------------------------
Subject: Digest Footer
_______________________________________________
dhcp-users mailing list
dhcp-users@lists.isc.org
https://lists.isc.org/mailman/listinfo/dhcp-users
------------------------------
End of dhcp-users Digest, Vol 132, Issue 26
*******************************************
