[Kea-users] Subnet_cmds Subnet ID gets reset on service restart
Darren Ankney
darren.ankney at gmail.com
Tue Mar 14 21:13:49 UTC 2023
Can you give it a try while specifying subnet IDs and see if the
problem disappears? When you say "restart" do you stop the process
and start it back up again or is a kill -HUP being issued (or
equivalent via systemd or other)? it might be holding some things in
memory (such as a counter from the last subnet add command) if it is
the latter.
On Mon, Mar 13, 2023 at 10:07 AM s k <sat98 at hotmail.com> wrote:
>
> Thanks for the quick reply .
>
> Sequence of steps:
> 1. subnet6_ add with out subnet id
> 2.config_write
>
> It ends up in sequential order .but when i restart the kea-dhcp6 service it throws error below until all the subnetid's exhausted in the config file . Where does the last used subnetid stored ? and when does it gets reset ?
>
>
> 2023-03-10 16:30:17.679 ERROR [kea-dhcp6.subnet-cmds-hooks/1603115.139787764285440] SUBNET_CMDS_SUBNET6_ADD_FAILED failed to add new IPv6 subnet: ID of the new IPv6 subnet '3' is already in use
>
>
>
>
> {
> "calculate-tee-times": false,
> "id": 1,
> "max-preferred-lifetime": 4294967295,
> "max-valid-lifetime": 4294967295,
> "min-preferred-lifetime": 0,
> "min-valid-lifetime": 0,
> "option-data": [ ],
> "pd-pools": [ ],
> "pools": [
> {
> "option-data": [ ],
> "pool": "fda4:220:0:1::8051:1-fda4:220:0:1::8051:ffff"
> }
> ],
> "preferred-lifetime": 4294967295,
> "rapid-commit": true,
> "rebind-timer": 4294967295,
> "relay": {
> "ip-addresses": [ ]
> },
> "renew-timer": 4294967295,
> "reservations": [ ],
> "store-extended-info": false,
> "subnet": "fda4:220:0:1::8051:0/64",
> "t1-percent": 0.5,
> "t2-percent": 0.8,
> "valid-lifetime": 4294967295
> },
> {
> "calculate-tee-times": false,
> "id": 2,
> "max-preferred-lifetime": 4294967295,
> "max-valid-lifetime": 4294967295,
> "min-preferred-lifetime": 4294967295,
> "min-valid-lifetime": 4294967295,
> "option-data": [ ],
> "pd-pools": [ ],
> "pools": [
> {
> "option-data": [ ],
> "pool": "fda0::34:0:0:8053:0/112"
> }
> ],
> "preferred-lifetime": 4294967295,
> "rapid-commit": true,
> "rebind-timer": 4294967295,
> "relay": {
> "ip-addresses": [ ]
> },
> "renew-timer": 4294967295,
> "reservations": [ ],
> "store-extended-info": false,
> "subnet": "fda0::34:0:0:8053:0/64",
> "t1-percent": 0.5,
> "t2-percent": 0.8,
> "valid-lifetime": 4294967295
> },
>
>
> ________________________________
> From: Kea-users <kea-users-bounces at lists.isc.org> on behalf of Darren Ankney <darren.ankney at gmail.com>
> Sent: Monday, March 13, 2023 5:49 AM
> To: kea-users <kea-users at lists.isc.org>
> Subject: Re: [Kea-users] Subnet_cmds Subnet ID gets reset on service restart
>
> Hello,
>
> How are you having the subnets persist across restarts? Are you
> executing a config-write? What order are the subnets ending up in on
> the drive after that? Do they have IDs listed? If not, I'm sure it
> will generate them in the order they are found in the configuration
> file.
>
> Also, you are running an older development version. I would suggest
> you start using the latest current stable version of 2.2.0.
>
> On Mon, Mar 13, 2023 at 1:22 AM s k <sat98 at hotmail.com> wrote:
> >
> > Hi
> >
> > I am using subnet6-add command from subnet6 hook library for adding subnets . And i am not assigning subnet id and let the system maintain auto generated value based on the notes below . it works well until we restart the service , on restart subnet-id gets reset and starts from 1 again which fails due to duplicate ID . i am using version 2.1.6. can you shed some light ?
> >
> >
> >
> > {
> > "command": "subnet6-add",
> > "arguments": {
> > "subnet6": [ {
> > "subnet": "2001:db8:1::/64",
> > ...
> > } ]
> > }
> > }
> >
> > Notes
> >
> > It is recommended, but not mandatory, to specify the subnet ID. If not specified, Kea will try to assign the next subnet-id value.
> >
> > This automatic ID value generator is simple; it returns a previously automatically assigned value, increased by 1. This works well, unless a subnet is manually created with a value bigger than one previously used. For example, if subnet4-add is called five times, each without an ID, Kea will assign IDs 1, 2, 3, 4, and 5 and it will work just fine. However, if subnet4-add is called five times, with the first subnet having the subnet-id of value 3 and the remaining ones having no subnet-id, the operation will fail. The first command (with the explicit value) will use subnet-id 3; the second command will create a subnet with id of 1; the third will use a value of 2; and finally the fourth will have the subnet-id value auto-generated as 3. However, since there is already a subnet with that ID, the process will fail.
> >
> > The general recommendation is either never use explicit values, so the auto-generated values will always work; or always use explicit values, so the auto-generation is never used. The two approaches can be mixed only if the administrator understands how internal automatic subnet-id generation works in Kea.
> >
> >
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