Re: [Kea-users] How to best update the KEA configuration on a HA hot-standby KEA setup

2022-11-18 Thread Dan Oachs 
I am running Kea on RockyLinux8 and RHEL8.  For those systems I usually run
"service kea-dhcp4 reload" and "service kea-dhcp6 reload" anytime I update
the .json configuration files.  And as far as I can tell, when I do that
there are no DHCP replies from the server for 10-20 seconds.  Or at least
nothing is logged during that time.  I have not looked at that very closely
as reloading the Kea service is not very common for us now that it is all
up and running.

--Dan


On Fri, Nov 18, 2022 at 2:24 AM Veronique Lefebure <
veronique.lefeb...@cern.ch> wrote:

> Many thanks for these interesting hints!
> A last question then: how do you notify KEA processes (kea-dhcp4,
> kea-dhcp6) in case you modify any of you json files ? with a "reload"
> command ?
> Thanks,
> Veronique
> --
> *From:* Dan Oachs 
> *Sent:* Thursday, November 17, 2022 8:36 PM
> *To:* Veronique Lefebure 
> *Cc:* kea-users@lists.isc.org 
> *Subject:* Re: [Kea-users] How to best update the KEA configuration on a
> HA hot-standby KEA setup
>
> The great thing about Kea is that it is very flexible and you can make it
> work in a wide variety of ways and find the setup that works best for your
> situation.
>
> In our case we have a hybrid setup.  The kea-dhcp4.conf file has all the
> global settings, and we define the hosts-database for storing host
> reservations.  We also break out all the subnet config into a separate
> subnets.json file and have the main file include that.
>
> We update the database directly from our own registration system, which is
> not recommended, but works fo us.  We chose not to pay for the host
> commands hook library that is required to use the api example you
> mentioned.
>
> I am pretty sure that you can do almost everything in the database that
> you can do in the config file, but are only using the database to store the
> host information.  I do see tables in the database that start with
> dhcp4_client_class which would lead me to believe that you can do what you
> want with the database configuration.
>
> --Dan
>
>
> On Thu, Nov 17, 2022 at 9:48 AM Veronique Lefebure <
> veronique.lefeb...@cern.ch> wrote:
>
> Thanks Dan!
>
>
> So you have a hybrid configuration ?
> What do you mean by "main configuration" ? Topology (shared-networks and
> subnets) in json file and host-reservations in a database ?
> Do you update the database using "reservation-add"  (
> https://kea.readthedocs.io/en/latest/api.html?highlight=host%20reservation#reservation-add
>  )
> ?
>
> We have client classes with a test expression that depends on the mac
> addresses of the clients.
> Can these classes be stored in the database as well ?
>
> Thanks,
> Veronique
>
>
> --
> *From:* Dan Oachs 
> *Sent:* Thursday, November 17, 2022 4:20 PM
> *To:* Veronique Lefebure 
> *Cc:* kea-users@lists.isc.org 
> *Subject:* Re: [Kea-users] How to best update the KEA configuration on a
> HA hot-standby KEA setup
>
> We also have all the main configuration in plain json files.  Like you, we
> require hosts on some of our networks to be registered.  Our registration
> system stores the MAC addresses in the Kea database.  For the past year or
> so, this has worked really well for us.
>
> I would highly suggest looking into storing the MAC addresses in a
> database so you don't need to reload kea for every change.  You don't need
> to use the database for anything else if you don't want to.   This can also
> be done without any of the extra hook libraries that cost money.
>
> --Dan
>
>
>
> On Thu, Nov 17, 2022 at 2:19 AM Veronique Lefebure <
> veronique.lefeb...@cern.ch> wrote:
>
> Hi,
>
> We don't use any database for storing the KEA configuration: we use plain
> json configuration files.
> We need to update the configuration very regularly because we allow only
> known clients (pre-registered mac addresses), hence the list of
> host-reservations is quite volatile.
>
> Véronique
> --
> *From:* Dan Oachs 
> *Sent:* Wednesday, November 16, 2022 6:31 PM
> *To:* Veronique Lefebure 
> *Cc:* kea-users@lists.isc.org 
> *Subject:* Re: [Kea-users] How to best update the KEA configuration on a
> HA hot-standby KEA setup
>
> I am curious why you are updating the config every 5 minutes.   We used to
> do that with our old DHCP server, but with Kea we moved to storing
> reservations in a database.  That way we rarely need to make changes to the
> actual Kea configuration that would necessitate a reload of the config.
>
> --Dan
>
>
> On Wed, Nov 16, 2022 at 10:27 AM Veronique Lefebure <
> veronique.lefeb...@cern.ch> wrote:
>
> Hi,
>
> When running KEA on one single server, (no HA), and updating the KEA dhcp
> configuration file every 5 minute, using "config-set"
>
> https://kea.readthedocs.io/en/latest/arm/ctrl-channel.html?highlight=config-set#the-config-set-command
>  ,
> we can see that KEA does not reply to the DHCP requests during 30-35
> seconds while "config-set" is running.
>
> Is it

Re: [Kea-users] How to best update the KEA configuration on a HA hot-standby KEA setup

2022-11-18 Thread Veronique Lefebure 
Many thanks for these interesting hints!
A last question then: how do you notify KEA processes (kea-dhcp4, kea-dhcp6) in 
case you modify any of you json files ? with a "reload" command ?
Thanks,
Veronique

From: Dan Oachs 
Sent: Thursday, November 17, 2022 8:36 PM
To: Veronique Lefebure 
Cc: kea-users@lists.isc.org 
Subject: Re: [Kea-users] How to best update the KEA configuration on a HA 
hot-standby KEA setup

The great thing about Kea is that it is very flexible and you can make it work 
in a wide variety of ways and find the setup that works best for your situation.

In our case we have a hybrid setup.  The kea-dhcp4.conf file has all the global 
settings, and we define the hosts-database for storing host reservations.  We 
also break out all the subnet config into a separate subnets.json file and have 
the main file include that.

We update the database directly from our own registration system, which is not 
recommended, but works fo us.  We chose not to pay for the host commands hook 
library that is required to use the api example you mentioned.

I am pretty sure that you can do almost everything in the database that you can 
do in the config file, but are only using the database to store the host 
information.  I do see tables in the database that start with 
dhcp4_client_class which would lead me to believe that you can do what you want 
with the database configuration.

--Dan


On Thu, Nov 17, 2022 at 9:48 AM Veronique Lefebure 
mailto:veronique.lefeb...@cern.ch>> wrote:
Thanks Dan!


So you have a hybrid configuration ?
What do you mean by "main configuration" ? Topology (shared-networks and 
subnets) in json file and host-reservations in a database ?
Do you update the database using "reservation-add"  
(https://kea.readthedocs.io/en/latest/api.html?highlight=host%20reservation#reservation-add
 ) ?

We have client classes with a test expression that depends on the mac addresses 
of the clients.
Can these classes be stored in the database as well ?

Thanks,
Veronique



From: Dan Oachs mailto:doa...@gac.edu>>
Sent: Thursday, November 17, 2022 4:20 PM
To: Veronique Lefebure 
mailto:veronique.lefeb...@cern.ch>>
Cc: kea-users@lists.isc.org 
mailto:kea-users@lists.isc.org>>
Subject: Re: [Kea-users] How to best update the KEA configuration on a HA 
hot-standby KEA setup

We also have all the main configuration in plain json files.  Like you, we 
require hosts on some of our networks to be registered.  Our registration 
system stores the MAC addresses in the Kea database.  For the past year or so, 
this has worked really well for us.

I would highly suggest looking into storing the MAC addresses in a database so 
you don't need to reload kea for every change.  You don't need to use the 
database for anything else if you don't want to.   This can also be done 
without any of the extra hook libraries that cost money.

--Dan



On Thu, Nov 17, 2022 at 2:19 AM Veronique Lefebure 
mailto:veronique.lefeb...@cern.ch>> wrote:
Hi,

We don't use any database for storing the KEA configuration: we use plain json 
configuration files.
We need to update the configuration very regularly because we allow only known 
clients (pre-registered mac addresses), hence the list of host-reservations is 
quite volatile.

Véronique

From: Dan Oachs mailto:doa...@gac.edu>>
Sent: Wednesday, November 16, 2022 6:31 PM
To: Veronique Lefebure 
mailto:veronique.lefeb...@cern.ch>>
Cc: kea-users@lists.isc.org 
mailto:kea-users@lists.isc.org>>
Subject: Re: [Kea-users] How to best update the KEA configuration on a HA 
hot-standby KEA setup

I am curious why you are updating the config every 5 minutes.   We used to do 
that with our old DHCP server, but with Kea we moved to storing reservations in 
a database.  That way we rarely need to make changes to the actual Kea 
configuration that would necessitate a reload of the config.

--Dan


On Wed, Nov 16, 2022 at 10:27 AM Veronique Lefebure 
mailto:veronique.lefeb...@cern.ch>> wrote:
Hi,

When running KEA on one single server, (no HA), and updating the KEA dhcp 
configuration file every 5 minute, using "config-set"
https://kea.readthedocs.io/en/latest/arm/ctrl-channel.html?highlight=config-set#the-config-set-command
 ,
we can see that KEA does not reply to the DHCP requests during 30-35 seconds 
while "config-set" is running.

Is it expected ?
If yes, if we add a second server in a HA hot-standby mode, can we expect it to 
answer to the DHCP requests while the first server is busy with config-set ?
If yes, we need to update the second server asynchronously with respect to the 
first one, else they would both be busy with "config-set" at the same time.

I would be interested to know how people are updating the KEA DHCP 
configuration in a HA hot-standby setup.

Thanks,
Veronique

--
ISC funds the development of this software with

Re: [Kea-users] How to best update the KEA configuration on a HA hot-standby KEA setup

2022-11-17 Thread Dan Oachs 
The great thing about Kea is that it is very flexible and you can make it
work in a wide variety of ways and find the setup that works best for your
situation.

In our case we have a hybrid setup.  The kea-dhcp4.conf file has all the
global settings, and we define the hosts-database for storing host
reservations.  We also break out all the subnet config into a separate
subnets.json file and have the main file include that.

We update the database directly from our own registration system, which is
not recommended, but works fo us.  We chose not to pay for the host
commands hook library that is required to use the api example you
mentioned.

I am pretty sure that you can do almost everything in the database that you
can do in the config file, but are only using the database to store the
host information.  I do see tables in the database that start with
dhcp4_client_class which would lead me to believe that you can do what you
want with the database configuration.

--Dan


On Thu, Nov 17, 2022 at 9:48 AM Veronique Lefebure <
veronique.lefeb...@cern.ch> wrote:

> Thanks Dan!
>
>
> So you have a hybrid configuration ?
> What do you mean by "main configuration" ? Topology (shared-networks and
> subnets) in json file and host-reservations in a database ?
> Do you update the database using "reservation-add"  (
> https://kea.readthedocs.io/en/latest/api.html?highlight=host%20reservation#reservation-add
>  )
> ?
>
> We have client classes with a test expression that depends on the mac
> addresses of the clients.
> Can these classes be stored in the database as well ?
>
> Thanks,
> Veronique
>
>
> --
> *From:* Dan Oachs 
> *Sent:* Thursday, November 17, 2022 4:20 PM
> *To:* Veronique Lefebure 
> *Cc:* kea-users@lists.isc.org 
> *Subject:* Re: [Kea-users] How to best update the KEA configuration on a
> HA hot-standby KEA setup
>
> We also have all the main configuration in plain json files.  Like you, we
> require hosts on some of our networks to be registered.  Our registration
> system stores the MAC addresses in the Kea database.  For the past year or
> so, this has worked really well for us.
>
> I would highly suggest looking into storing the MAC addresses in a
> database so you don't need to reload kea for every change.  You don't need
> to use the database for anything else if you don't want to.   This can also
> be done without any of the extra hook libraries that cost money.
>
> --Dan
>
>
>
> On Thu, Nov 17, 2022 at 2:19 AM Veronique Lefebure <
> veronique.lefeb...@cern.ch> wrote:
>
> Hi,
>
> We don't use any database for storing the KEA configuration: we use plain
> json configuration files.
> We need to update the configuration very regularly because we allow only
> known clients (pre-registered mac addresses), hence the list of
> host-reservations is quite volatile.
>
> Véronique
> --
> *From:* Dan Oachs 
> *Sent:* Wednesday, November 16, 2022 6:31 PM
> *To:* Veronique Lefebure 
> *Cc:* kea-users@lists.isc.org 
> *Subject:* Re: [Kea-users] How to best update the KEA configuration on a
> HA hot-standby KEA setup
>
> I am curious why you are updating the config every 5 minutes.   We used to
> do that with our old DHCP server, but with Kea we moved to storing
> reservations in a database.  That way we rarely need to make changes to the
> actual Kea configuration that would necessitate a reload of the config.
>
> --Dan
>
>
> On Wed, Nov 16, 2022 at 10:27 AM Veronique Lefebure <
> veronique.lefeb...@cern.ch> wrote:
>
> Hi,
>
> When running KEA on one single server, (no HA), and updating the KEA dhcp
> configuration file every 5 minute, using "config-set"
>
> https://kea.readthedocs.io/en/latest/arm/ctrl-channel.html?highlight=config-set#the-config-set-command
>  ,
> we can see that KEA does not reply to the DHCP requests during 30-35
> seconds while "config-set" is running.
>
> Is it expected ?
> If yes, if we add a second server in a HA hot-standby mode, can we expect
> it to answer to the DHCP requests while the first server is busy with
> config-set ?
> If yes, we need to update the second server asynchronously with respect to
> the first one, else they would both be busy with "config-set" at the same
> time.
>
> I would be interested to know how people are updating the KEA DHCP
> configuration in a HA hot-standby setup.
>
> Thanks,
> Veronique
>
> --
> ISC funds the development of this software with paid support
> subscriptions. Contact us at https://www.isc.org/contact/ for more
> information.
>
> To unsubscribe visit https://lists.isc.org/mailman/listinfo/kea-users.
>
> Kea-users mailing list
> Kea-users@lists.isc.org
> https://lists.isc.org/mailman/listinfo/kea-users
>
>
-- 
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Contact us at https://www.isc.org/contact/ for more information.

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Re: [Kea-users] How to best update the KEA configuration on a HA hot-standby KEA setup

2022-11-17 Thread Veronique Lefebure 
Thanks Dan!


So you have a hybrid configuration ?
What do you mean by "main configuration" ? Topology (shared-networks and 
subnets) in json file and host-reservations in a database ?
Do you update the database using "reservation-add"  
(https://kea.readthedocs.io/en/latest/api.html?highlight=host%20reservation#reservation-add
 ) ?

We have client classes with a test expression that depends on the mac addresses 
of the clients.
Can these classes be stored in the database as well ?

Thanks,
Veronique



From: Dan Oachs 
Sent: Thursday, November 17, 2022 4:20 PM
To: Veronique Lefebure 
Cc: kea-users@lists.isc.org 
Subject: Re: [Kea-users] How to best update the KEA configuration on a HA 
hot-standby KEA setup

We also have all the main configuration in plain json files.  Like you, we 
require hosts on some of our networks to be registered.  Our registration 
system stores the MAC addresses in the Kea database.  For the past year or so, 
this has worked really well for us.

I would highly suggest looking into storing the MAC addresses in a database so 
you don't need to reload kea for every change.  You don't need to use the 
database for anything else if you don't want to.   This can also be done 
without any of the extra hook libraries that cost money.

--Dan



On Thu, Nov 17, 2022 at 2:19 AM Veronique Lefebure 
mailto:veronique.lefeb...@cern.ch>> wrote:
Hi,

We don't use any database for storing the KEA configuration: we use plain json 
configuration files.
We need to update the configuration very regularly because we allow only known 
clients (pre-registered mac addresses), hence the list of host-reservations is 
quite volatile.

Véronique

From: Dan Oachs mailto:doa...@gac.edu>>
Sent: Wednesday, November 16, 2022 6:31 PM
To: Veronique Lefebure 
mailto:veronique.lefeb...@cern.ch>>
Cc: kea-users@lists.isc.org 
mailto:kea-users@lists.isc.org>>
Subject: Re: [Kea-users] How to best update the KEA configuration on a HA 
hot-standby KEA setup

I am curious why you are updating the config every 5 minutes.   We used to do 
that with our old DHCP server, but with Kea we moved to storing reservations in 
a database.  That way we rarely need to make changes to the actual Kea 
configuration that would necessitate a reload of the config.

--Dan


On Wed, Nov 16, 2022 at 10:27 AM Veronique Lefebure 
mailto:veronique.lefeb...@cern.ch>> wrote:
Hi,

When running KEA on one single server, (no HA), and updating the KEA dhcp 
configuration file every 5 minute, using "config-set"
https://kea.readthedocs.io/en/latest/arm/ctrl-channel.html?highlight=config-set#the-config-set-command
 ,
we can see that KEA does not reply to the DHCP requests during 30-35 seconds 
while "config-set" is running.

Is it expected ?
If yes, if we add a second server in a HA hot-standby mode, can we expect it to 
answer to the DHCP requests while the first server is busy with config-set ?
If yes, we need to update the second server asynchronously with respect to the 
first one, else they would both be busy with "config-set" at the same time.

I would be interested to know how people are updating the KEA DHCP 
configuration in a HA hot-standby setup.

Thanks,
Veronique

--
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Contact us at https://www.isc.org/contact/ for more information.

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Re: [Kea-users] How to best update the KEA configuration on a HA hot-standby KEA setup

2022-11-17 Thread Dan Oachs 
We also have all the main configuration in plain json files.  Like you, we
require hosts on some of our networks to be registered.  Our registration
system stores the MAC addresses in the Kea database.  For the past year or
so, this has worked really well for us.

I would highly suggest looking into storing the MAC addresses in a database
so you don't need to reload kea for every change.  You don't need to use
the database for anything else if you don't want to.   This can also be
done without any of the extra hook libraries that cost money.

--Dan



On Thu, Nov 17, 2022 at 2:19 AM Veronique Lefebure <
veronique.lefeb...@cern.ch> wrote:

> Hi,
>
> We don't use any database for storing the KEA configuration: we use plain
> json configuration files.
> We need to update the configuration very regularly because we allow only
> known clients (pre-registered mac addresses), hence the list of
> host-reservations is quite volatile.
>
> Véronique
> --
> *From:* Dan Oachs 
> *Sent:* Wednesday, November 16, 2022 6:31 PM
> *To:* Veronique Lefebure 
> *Cc:* kea-users@lists.isc.org 
> *Subject:* Re: [Kea-users] How to best update the KEA configuration on a
> HA hot-standby KEA setup
>
> I am curious why you are updating the config every 5 minutes.   We used to
> do that with our old DHCP server, but with Kea we moved to storing
> reservations in a database.  That way we rarely need to make changes to the
> actual Kea configuration that would necessitate a reload of the config.
>
> --Dan
>
>
> On Wed, Nov 16, 2022 at 10:27 AM Veronique Lefebure <
> veronique.lefeb...@cern.ch> wrote:
>
> Hi,
>
> When running KEA on one single server, (no HA), and updating the KEA dhcp
> configuration file every 5 minute, using "config-set"
>
> https://kea.readthedocs.io/en/latest/arm/ctrl-channel.html?highlight=config-set#the-config-set-command
>  ,
> we can see that KEA does not reply to the DHCP requests during 30-35
> seconds while "config-set" is running.
>
> Is it expected ?
> If yes, if we add a second server in a HA hot-standby mode, can we expect
> it to answer to the DHCP requests while the first server is busy with
> config-set ?
> If yes, we need to update the second server asynchronously with respect to
> the first one, else they would both be busy with "config-set" at the same
> time.
>
> I would be interested to know how people are updating the KEA DHCP
> configuration in a HA hot-standby setup.
>
> Thanks,
> Veronique
>
> --
> ISC funds the development of this software with paid support
> subscriptions. Contact us at https://www.isc.org/contact/ for more
> information.
>
> To unsubscribe visit https://lists.isc.org/mailman/listinfo/kea-users.
>
> Kea-users mailing list
> Kea-users@lists.isc.org
> https://lists.isc.org/mailman/listinfo/kea-users
>
>
-- 
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Re: [Kea-users] How to best update the KEA configuration on a HA hot-standby KEA setup

2022-11-17 Thread Veronique Lefebure 
I am wondering whether it is not more efficient to perform a
"config-write" followed by a "config-reload"
rather than a "config-set" ?


From: Kea-users  on behalf of Veronique 
Lefebure 
Sent: Thursday, November 17, 2022 9:19 AM
To: Dan Oachs 
Cc: kea-users@lists.isc.org 
Subject: Re: [Kea-users] How to best update the KEA configuration on a HA 
hot-standby KEA setup

Hi,

We don't use any database for storing the KEA configuration: we use plain json 
configuration files.
We need to update the configuration very regularly because we allow only known 
clients (pre-registered mac addresses), hence the list of host-reservations is 
quite volatile.

Véronique

From: Dan Oachs 
Sent: Wednesday, November 16, 2022 6:31 PM
To: Veronique Lefebure 
Cc: kea-users@lists.isc.org 
Subject: Re: [Kea-users] How to best update the KEA configuration on a HA 
hot-standby KEA setup

I am curious why you are updating the config every 5 minutes.   We used to do 
that with our old DHCP server, but with Kea we moved to storing reservations in 
a database.  That way we rarely need to make changes to the actual Kea 
configuration that would necessitate a reload of the config.

--Dan


On Wed, Nov 16, 2022 at 10:27 AM Veronique Lefebure 
mailto:veronique.lefeb...@cern.ch>> wrote:
Hi,

When running KEA on one single server, (no HA), and updating the KEA dhcp 
configuration file every 5 minute, using "config-set"
https://kea.readthedocs.io/en/latest/arm/ctrl-channel.html?highlight=config-set#the-config-set-command
 ,
we can see that KEA does not reply to the DHCP requests during 30-35 seconds 
while "config-set" is running.

Is it expected ?
If yes, if we add a second server in a HA hot-standby mode, can we expect it to 
answer to the DHCP requests while the first server is busy with config-set ?
If yes, we need to update the second server asynchronously with respect to the 
first one, else they would both be busy with "config-set" at the same time.

I would be interested to know how people are updating the KEA DHCP 
configuration in a HA hot-standby setup.

Thanks,
Veronique

--
ISC funds the development of this software with paid support subscriptions. 
Contact us at https://www.isc.org/contact/ for more information.

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Re: [Kea-users] How to best update the KEA configuration on a HA hot-standby KEA setup

2022-11-17 Thread Veronique Lefebure 
Hi,

We don't use any database for storing the KEA configuration: we use plain json 
configuration files.
We need to update the configuration very regularly because we allow only known 
clients (pre-registered mac addresses), hence the list of host-reservations is 
quite volatile.

Véronique

From: Dan Oachs 
Sent: Wednesday, November 16, 2022 6:31 PM
To: Veronique Lefebure 
Cc: kea-users@lists.isc.org 
Subject: Re: [Kea-users] How to best update the KEA configuration on a HA 
hot-standby KEA setup

I am curious why you are updating the config every 5 minutes.   We used to do 
that with our old DHCP server, but with Kea we moved to storing reservations in 
a database.  That way we rarely need to make changes to the actual Kea 
configuration that would necessitate a reload of the config.

--Dan


On Wed, Nov 16, 2022 at 10:27 AM Veronique Lefebure 
mailto:veronique.lefeb...@cern.ch>> wrote:
Hi,

When running KEA on one single server, (no HA), and updating the KEA dhcp 
configuration file every 5 minute, using "config-set"
https://kea.readthedocs.io/en/latest/arm/ctrl-channel.html?highlight=config-set#the-config-set-command
 ,
we can see that KEA does not reply to the DHCP requests during 30-35 seconds 
while "config-set" is running.

Is it expected ?
If yes, if we add a second server in a HA hot-standby mode, can we expect it to 
answer to the DHCP requests while the first server is busy with config-set ?
If yes, we need to update the second server asynchronously with respect to the 
first one, else they would both be busy with "config-set" at the same time.

I would be interested to know how people are updating the KEA DHCP 
configuration in a HA hot-standby setup.

Thanks,
Veronique

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Re: [Kea-users] How to best update the KEA configuration on a HA hot-standby KEA setup

2022-11-16 Thread Dan Oachs 
I am curious why you are updating the config every 5 minutes.   We used to
do that with our old DHCP server, but with Kea we moved to storing
reservations in a database.  That way we rarely need to make changes to the
actual Kea configuration that would necessitate a reload of the config.

--Dan


On Wed, Nov 16, 2022 at 10:27 AM Veronique Lefebure <
veronique.lefeb...@cern.ch> wrote:

> Hi,
>
> When running KEA on one single server, (no HA), and updating the KEA dhcp
> configuration file every 5 minute, using "config-set"
>
> https://kea.readthedocs.io/en/latest/arm/ctrl-channel.html?highlight=config-set#the-config-set-command
>  ,
> we can see that KEA does not reply to the DHCP requests during 30-35
> seconds while "config-set" is running.
>
> Is it expected ?
> If yes, if we add a second server in a HA hot-standby mode, can we expect
> it to answer to the DHCP requests while the first server is busy with
> config-set ?
> If yes, we need to update the second server asynchronously with respect to
> the first one, else they would both be busy with "config-set" at the same
> time.
>
> I would be interested to know how people are updating the KEA DHCP
> configuration in a HA hot-standby setup.
>
> Thanks,
> Veronique
>
> --
> ISC funds the development of this software with paid support
> subscriptions. Contact us at https://www.isc.org/contact/ for more
> information.
>
> To unsubscribe visit https://lists.isc.org/mailman/listinfo/kea-users.
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Re: [Kea-users] How to best update the KEA configuration on a HA hot-standby KEA setup

2022-11-16 Thread Dan Oachs 
If you really wanted to make sure the standby was serving requests during
that period, you could try starting and stopping via the
ha-maintenance-start command.  I don't do it that frequently, but I run
that command before installing updates and rebooting the main kea server.

--Dan


On Wed, Nov 16, 2022 at 10:42 AM perl-list  wrote:

> The hot-standby will only start after some criteria are met.  Some of the
> parameters are tunable.  See:
> https://kea.readthedocs.io/en/kea-1.8.1/arm/hooks.html#load-balancing-configuration
> Not sure if you can tune it to start responding within a 30 to 35 second
> window.
>
> We just modify the config on disk and then restart the kea process, but
> then we aren't doing anything special with databases or anything, just the
> JSON config in a single file.  We also aren't changing the config and
> restarting every 5 minutes.
>
> - Original Message -
> > From: "Veronique Lefebure" 
> > To: "kea-users" 
> > Sent: Wednesday, November 16, 2022 11:27:07 AM
> > Subject: [Kea-users] How to best update the KEA configuration on a HA
> hot-standby KEA setup
>
> > Hi,
>
> > When running KEA on one single server, (no HA), and updating the KEA dhcp
> > configuration file every 5 minute, using "config-set"
> > [
> >
> https://kea.readthedocs.io/en/latest/arm/ctrl-channel.html?highlight=config-set#the-config-set-command
> > |
> >
> https://kea.readthedocs.io/en/latest/arm/ctrl-channel.html?highlight=config-set#the-config-set-command
> > ] ,
> > we can see that KEA does not reply to the DHCP requests during 30-35
> seconds
> > while "config-set" is running.
>
> > Is it expected ?
> > If yes, if we add a second server in a HA hot-standby mode, can we
> expect it to
> > answer to the DHCP requests while the first server is busy with
> config-set ?
> > If yes, we need to update the second server asynchronously with respect
> to the
> > first one, else they would both be busy with "config-set" at the same
> time.
>
> > I would be interested to know how people are updating the KEA DHCP
> configuration
> > in a HA hot-standby setup.
>
> > Thanks,
> > Veronique
>
> > --
> > ISC funds the development of this software with paid support
> subscriptions.
> > Contact us at https://www.isc.org/contact/ for more information.
>
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Re: [Kea-users] How to best update the KEA configuration on a HA hot-standby KEA setup

2022-11-16 Thread perl-list 
The hot-standby will only start after some criteria are met.  Some of the 
parameters are tunable.  See: 
https://kea.readthedocs.io/en/kea-1.8.1/arm/hooks.html#load-balancing-configuration
  Not sure if you can tune it to start responding within a 30 to 35 second 
window.

We just modify the config on disk and then restart the kea process, but then we 
aren't doing anything special with databases or anything, just the JSON config 
in a single file.  We also aren't changing the config and restarting every 5 
minutes.

- Original Message -
> From: "Veronique Lefebure" 
> To: "kea-users" 
> Sent: Wednesday, November 16, 2022 11:27:07 AM
> Subject: [Kea-users] How to best update the KEA configuration on a HA 
> hot-standby KEA setup

> Hi,

> When running KEA on one single server, (no HA), and updating the KEA dhcp
> configuration file every 5 minute, using "config-set"
> [
> https://kea.readthedocs.io/en/latest/arm/ctrl-channel.html?highlight=config-set#the-config-set-command
> |
> https://kea.readthedocs.io/en/latest/arm/ctrl-channel.html?highlight=config-set#the-config-set-command
> ] ,
> we can see that KEA does not reply to the DHCP requests during 30-35 seconds
> while "config-set" is running.

> Is it expected ?
> If yes, if we add a second server in a HA hot-standby mode, can we expect it 
> to
> answer to the DHCP requests while the first server is busy with config-set ?
> If yes, we need to update the second server asynchronously with respect to the
> first one, else they would both be busy with "config-set" at the same time.

> I would be interested to know how people are updating the KEA DHCP 
> configuration
> in a HA hot-standby setup.

> Thanks,
> Veronique

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> Contact us at https://www.isc.org/contact/ for more information.

> To unsubscribe visit https://lists.isc.org/mailman/listinfo/kea-users.

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