Re: [Dnsmasq-discuss] prevent dnsmasq from releasing IPs

[Simon Kelley]

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Hash: SHA256

On 01/03/16 09:29, Nicolas Cavallari wrote:
> On 26/01/2016 14:46, Simon Kelley wrote:
>> 
>> 
>> On 26/01/16 13:42, Stefan Priebe - Profihost AG wrote:
>> 
>> 
>> 
>>> what about writing and sending kill 1 / HUP?
>> 
>> 
>> 
>> No. The only only way to make that work would be to
>> 
>> 1) Stop dnsmasq with SIGTERM 2) modify the leases file 3)
>> restart dnsmasq
>> 
>> 
>> in that order.
> 
> You forgot about my patches that adds a D-Bus method to add leases 
> to the internal copy, that you merged in June last year :)
> 
> It's documented in dbus/DBus-interface, as you requested :)
> 

Indeed. What Nicolas said.


Actually, it's worse: sometimes I find code implementing features in
dnsmasq which I wrote, and I have no memory of...


Cheers,

Simon.

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Re: [Dnsmasq-discuss] prevent dnsmasq from releasing IPs

[Nicolas Cavallari]

On 26/01/2016 14:46, Simon Kelley wrote:
> 
> 
> On 26/01/16 13:42, Stefan Priebe - Profihost AG wrote:
> 
> 
> 
>> what about writing and sending kill 1 / HUP?
> 
> 
> 
> No. The only only way to make that work would be to
> 
> 1) Stop dnsmasq with SIGTERM
> 2) modify the leases file
> 3) restart dnsmasq
> 
> 
> in that order.

You forgot about my patches that adds a D-Bus method to add leases to
the internal copy, that you merged in June last year :)

It's documented in dbus/DBus-interface, as you requested :)

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Re: [Dnsmasq-discuss] prevent dnsmasq from releasing IPs

[Hartmut Krafft]

On Tue, 26 Jan 2016 21:31:29 +
Simon Kelley  wrote:

> -BEGIN PGP SIGNED MESSAGE-
> Hash: SHA256
> 
> 
> 
> On 26/01/16 14:56, Stefan Priebe - Profihost AG wrote:
> > 
> >> Am 26.01.2016 um 14:46 schrieb Simon Kelley
> >> :
> >> 
> > 
> > 
>  On 26/01/16 13:42, Stefan Priebe - Profihost AG wrote:
> > 
>  
>  what about writing and sending kill 1 / HUP?
> > 
> > 
> > No. The only only way to make that work would be to
> > 
> > 1) Stop dnsmasq with SIGTERM 2) modify the leases file 3) restart
> > dnsmasq
> > 
> > 
> > in that
> > 
> >> Last idea isn't it possible to make the host static on add? If it
> >> is which file should I use to add the mac  hostname IP
> >> combination
> 
> 
> Add the hostname and IP in /etc/hosts, and add the MAC/hostname or
> MAC/IP as --dhcp-host configuration.
> 
> You can provide all three in --dhcp-host, that will ensure that only
> the specified MAC address gets that IP address BUT, the IP/name  will
> only exist in the DNS whilst the DHCP lease exists. If you want the
> hostname to always resolve, you have to put it in /etc/hosts or
> friend.

If you want to avoid shutting down dnsmasq you could use the
dhcp-hostsfile and addn-hosts directives (see manpage). You can
regenerate those files while dnsmasq is running and send a hangup
signal to the dnsmasq process which will cause them to be read and the
information updated.
I've made me a unified dhcp+hostsfile input file and a script to
generate both dhcp-hostsfile and addnhost from that because I found
that I preferred not to have to enter redundant data in two files (and
invariably ending up with contradictory entries).
You'll just have to devise a way to enter your information into those
files for your usecase.

Hartmut


> 
> 
> Cheers,
> 
> Simon.



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Re: [Dnsmasq-discuss] prevent dnsmasq from releasing IPs

[Stefan Priebe - Profihost AG]

Am 25.01.2016 um 23:20 schrieb Simon Kelley:
> Not directly. If you just want a record of leases after they've been
> released, then you can save information by using the dhcp-script
> function. If you want to stop re-use of the addresses, then the best
> you can easily do is to allocate static addresses to clients. That
> will stop the addresses being allocated to other clients, even
> when not leased.

I had the hope that dnsmasq evaluate the return code of the dhcp-script
and i can use exit 1 if i do not want to delete the IP.

Is it possible that i readd the IP to the leases file in the
dhcp-script? Or does dnsmasq remove the entry after processing the
dhcp-script?

Stefan
> 
> 
> Cheers,
> 
> Simon.
> 
> On 25/01/16 16:42, Stefan Priebe - Profihost AG wrote:
>> Hi,
> 
>> is there any way to keep IPs in the dnsmasq DB even the host sends
>> a release?
> 
>> I want to keep those entry at least for 2 more days.
> 
>> Greets, Stefan
> 
>> ___ Dnsmasq-discuss
>> mailing list Dnsmasq-discuss@lists.thekelleys.org.uk 
>> http://lists.thekelleys.org.uk/mailman/listinfo/dnsmasq-discuss
> 
> 
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Re: [Dnsmasq-discuss] prevent dnsmasq from releasing IPs

[Simon Kelley]

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Hash: SHA256



On 26/01/16 07:25, Stefan Priebe - Profihost AG wrote:
> 
> 
> Am 25.01.2016 um 23:20 schrieb Simon Kelley:
>> Not directly. If you just want a record of leases after they've
>> been released, then you can save information by using the
>> dhcp-script function. If you want to stop re-use of the
>> addresses, then the best you can easily do is to allocate static
>> addresses to clients. That will stop the addresses being
>> allocated to other clients, even when not leased.
> 
> I had the hope that dnsmasq evaluate the return code of the
> dhcp-script and i can use exit 1 if i do not want to delete the
> IP.

That's an interesting thought. The dhcp-script gets run
asynchronously, so it wouldn't be trivial to implement, but it may be
possible.
> 
> Is it possible that i readd the IP to the leases file in the 
> dhcp-script? Or does dnsmasq remove the entry after processing the 
> dhcp-script?

That wouldn't work at all. Dnsmasq only reads the contents of the
lease file at startup. The rest of the time it's working from an
internal copy. If you altered the file, your changes would just be
overwritten and ignored.


Cheers,

Simon.

> 
> Stefan
>> 
>> 
>> Cheers,
>> 
>> Simon.
>> 
>> On 25/01/16 16:42, Stefan Priebe - Profihost AG wrote:
>>> Hi,
>> 
>>> is there any way to keep IPs in the dnsmasq DB even the host
>>> sends a release?
>> 
>>> I want to keep those entry at least for 2 more days.
>> 
>>> Greets, Stefan
>> 
>>> ___
>>> Dnsmasq-discuss mailing list
>>> Dnsmasq-discuss@lists.thekelleys.org.uk 
>>> http://lists.thekelleys.org.uk/mailman/listinfo/dnsmasq-discuss
>>
>>
>>
>>> 
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>> 
> 
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Re: [Dnsmasq-discuss] prevent dnsmasq from releasing IPs

[Stefan Priebe - Profihost AG]

Am 26.01.2016 um 14:32 schrieb Simon Kelley:
> 
> 
> On 26/01/16 07:25, Stefan Priebe - Profihost AG wrote:
> 
> 
>> Am 25.01.2016 um 23:20 schrieb Simon Kelley:
>>> Not directly. If you just want a record of leases after they've
>>> been released, then you can save information by using the
>>> dhcp-script function. If you want to stop re-use of the
>>> addresses, then the best you can easily do is to allocate static
>>> addresses to clients. That will stop the addresses being
>>> allocated to other clients, even when not leased.
> 
>> I had the hope that dnsmasq evaluate the return code of the
>> dhcp-script and i can use exit 1 if i do not want to delete the
>> IP.
> 
> That's an interesting thought. The dhcp-script gets run
> asynchronously, so it wouldn't be trivial to implement, but it may be
> possible.
> 
>> Is it possible that i readd the IP to the leases file in the 
>> dhcp-script? Or does dnsmasq remove the entry after processing the 
>> dhcp-script?
> 
> That wouldn't work at all. Dnsmasq only reads the contents of the
> lease file at startup. The rest of the time it's working from an
> internal copy. If you altered the file, your changes would just be
> overwritten and ignored.

what about writing and sending kill 1 / HUP?

> 
> 
> Cheers,
> 
> Simon.
> 
> 
>> Stefan
>>>
>>>
>>> Cheers,
>>>
>>> Simon.
>>>
>>> On 25/01/16 16:42, Stefan Priebe - Profihost AG wrote:
 Hi,
>>>
 is there any way to keep IPs in the dnsmasq DB even the host
 sends a release?
>>>
 I want to keep those entry at least for 2 more days.
>>>
 Greets, Stefan
>>>
 ___
 Dnsmasq-discuss mailing list
 Dnsmasq-discuss@lists.thekelleys.org.uk 
 http://lists.thekelleys.org.uk/mailman/listinfo/dnsmasq-discuss
>>>
>>>
>>>

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>>>
> 
> 

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Re: [Dnsmasq-discuss] prevent dnsmasq from releasing IPs

[Simon Kelley]

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Hash: SHA256



On 26/01/16 13:42, Stefan Priebe - Profihost AG wrote:
> 

> 
> what about writing and sending kill 1 / HUP?
> 


No. The only only way to make that work would be to

1) Stop dnsmasq with SIGTERM
2) modify the leases file
3) restart dnsmasq


in that order.


Cheers,

Simon.

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Re: [Dnsmasq-discuss] prevent dnsmasq from releasing IPs

[Stefan Priebe - Profihost AG]

> Am 26.01.2016 um 14:46 schrieb Simon Kelley :
> 
> -BEGIN PGP SIGNED MESSAGE-
> Hash: SHA256
> 
> 
> 
>> On 26/01/16 13:42, Stefan Priebe - Profihost AG wrote:
> 
>> 
>> what about writing and sending kill 1 / HUP?
> 
> 
> No. The only only way to make that work would be to
> 
> 1) Stop dnsmasq with SIGTERM
> 2) modify the leases file
> 3) restart dnsmasq
> 
> 
> in that 

Last idea isn't it possible to make the host static on add? If it is which file 
should I use to add the mac  hostname IP combination



> 
> 
> Cheers,
> 
> Simon.
> 
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Re: [Dnsmasq-discuss] prevent dnsmasq from releasing IPs

[Neil Jerram]

On 26/01/16 15:09, Stefan Priebe - Profihost AG wrote:
>> Am 26.01.2016 um 14:46 schrieb Simon Kelley :
>>
>> -BEGIN PGP SIGNED MESSAGE-
>> Hash: SHA256
>>
>>
>>
>>> On 26/01/16 13:42, Stefan Priebe - Profihost AG wrote:
>>> what about writing and sending kill 1 / HUP?
>>
>> No. The only only way to make that work would be to
>>
>> 1) Stop dnsmasq with SIGTERM
>> 2) modify the leases file
>> 3) restart dnsmasq
>>
>>
>> in that 
> Last idea isn't it possible to make the host static on add? If it is which 
> file should I use to add the mac  hostname IP combination

FYI, at https://github.com/projectcalico/calico/issues/233 we have a
long trail about what we think is the opposite problem.  Namely, that
Dnsmasq will not reallocate an IP that should have been released, and
whose old IP/MAC mapping has been removed from the 'host' config file. 
As you'll see if you read that trail, we thought this was caused by a
problem in the delivery of the DHCP_RELEASE message to Dnsmasq, and
hence Dnsmasq retaining a record of the old lease in its internal data.

Based on that, I'd expect that if you deliberately did something to stop
the DHCP_RELEASE message from reaching Dnsmasq, Dnsmasq would then
retain the old lease (which I believe is what you're asking for).

However, that understanding does seem to be contradicted by what Simon
has said in this thread, and I would strongly assume that Simon is right
- but perhaps there might still be some hint or useful information in
that issue trail.

Regards,
Neil


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Re: [Dnsmasq-discuss] prevent dnsmasq from releasing IPs

[Simon Kelley]

-BEGIN PGP SIGNED MESSAGE-
Hash: SHA256



On 26/01/16 14:56, Stefan Priebe - Profihost AG wrote:
> 
>> Am 26.01.2016 um 14:46 schrieb Simon Kelley
>> :
>> 
> 
> 
 On 26/01/16 13:42, Stefan Priebe - Profihost AG wrote:
> 
 
 what about writing and sending kill 1 / HUP?
> 
> 
> No. The only only way to make that work would be to
> 
> 1) Stop dnsmasq with SIGTERM 2) modify the leases file 3) restart
> dnsmasq
> 
> 
> in that
> 
>> Last idea isn't it possible to make the host static on add? If it
>> is which file should I use to add the mac  hostname IP
>> combination


Add the hostname and IP in /etc/hosts, and add the MAC/hostname or
MAC/IP as --dhcp-host configuration.

You can provide all three in --dhcp-host, that will ensure that only
the specified MAC address gets that IP address BUT, the IP/name  will
only exist in the DNS whilst the DHCP lease exists. If you want the
hostname to always resolve, you have to put it in /etc/hosts or friend.


Cheers,

Simon.

> 
> 
> 
> 
> 
> Cheers,
> 
> Simon.
> 
> 
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Re: [Dnsmasq-discuss] prevent dnsmasq from releasing IPs

[Simon Kelley]

-BEGIN PGP SIGNED MESSAGE-
Hash: SHA256



On 26/01/16 16:03, Neil Jerram wrote:
> On 26/01/16 15:09, Stefan Priebe - Profihost AG wrote:
>>> Am 26.01.2016 um 14:46 schrieb Simon Kelley
>>> :
>>> 
>>> -BEGIN PGP SIGNED MESSAGE- Hash: SHA256
>>> 
>>> 
>>> 
 On 26/01/16 13:42, Stefan Priebe - Profihost AG wrote: what
 about writing and sending kill 1 / HUP?
>>> 
>>> No. The only only way to make that work would be to
>>> 
>>> 1) Stop dnsmasq with SIGTERM 2) modify the leases file 3)
>>> restart dnsmasq
>>> 
>>> 
>>> in that
>> Last idea isn't it possible to make the host static on add? If it
>> is which file should I use to add the mac  hostname IP
>> combination
> 
> FYI, at https://github.com/projectcalico/calico/issues/233 we have
> a long trail about what we think is the opposite problem.  Namely,
> that Dnsmasq will not reallocate an IP that should have been
> released, and whose old IP/MAC mapping has been removed from the
> 'host' config file. As you'll see if you read that trail, we
> thought this was caused by a problem in the delivery of the
> DHCP_RELEASE message to Dnsmasq, and hence Dnsmasq retaining a
> record of the old lease in its internal data.
> 
> Based on that, I'd expect that if you deliberately did something to
> stop the DHCP_RELEASE message from reaching Dnsmasq, Dnsmasq would
> then retain the old lease (which I believe is what you're asking
> for).

That's certainly true.
> 
> However, that understanding does seem to be contradicted by what
> Simon has said in this thread, and I would strongly assume that
> Simon is right - but perhaps there might still be some hint or
> useful information in that issue trail.
> 


I looks like the problem there is exactly as you say: dnsmasq is
failing to allocate an address because it has run out of free
addresses because addresses have been consumed by machine which are
now "dead" but did not release their address when they died, so the
address is unavailable until the lease period expires.


Cheers,

Simon.

> Regards, Neil
> 
> 
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Re: [Dnsmasq-discuss] prevent dnsmasq from releasing IPs

[Simon Kelley]

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Not directly. If you just want a record of leases after they've been
released, then you can save information by using the dhcp-script
function. If you want to stop re-use of the addresses, then the best
you can easily do is to allocate static addresses to clients. That
will stop the addresses being allocated to other clients, even
when not leased.


Cheers,

Simon.

On 25/01/16 16:42, Stefan Priebe - Profihost AG wrote:
> Hi,
> 
> is there any way to keep IPs in the dnsmasq DB even the host sends
> a release?
> 
> I want to keep those entry at least for 2 more days.
> 
> Greets, Stefan
> 
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> mailing list Dnsmasq-discuss@lists.thekelleys.org.uk 
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