[Kea-users] Fetching Active Leases
Darren Ankney
darren.ankney at gmail.com
Thu Jun 8 12:38:07 UTC 2023
Hi Shobhith,
Nothing would stop those leases from still showing up if they are
still active. Since they are not in the lease file, they can be
removed by restarting the server. You could also remove them with
lease4-del API command
(https://kea.readthedocs.io/en/latest/arm/hooks.html#the-lease4-del-lease6-del-commands).
Removing the pool and adding a different pool will not remove active
leases in the pool. Indeed even removing the subnet wouldn't remove
leases. But the leases wouldn't still be shown if the subnet ID is
different in a new subnet.
On Thu, Jun 8, 2023 at 8:31 AM Shobhith Chikku <shobhithchikku at gmail.com> wrote:
>
> Thanks, Darren,
> The main issue I face is
> 1. I have created a scope 3.0.0.10 - 3.0.0.20
> 2. I have generated leases from that scope.
> 3. I deleted that scope and created another one in the same subnet 3.0.0.50 - 3.0.0.100.
> 4. When I fetch the active lease, I am also getting the leases from the deleted scope 3.0.0.10 - 3.0.0.20 also ( I shouldn't get them right?).
> How do I solve this?
> I tried the LFC process, which only cleans up the leases from the lease file, but the memory still has them.
> Here is my config file.
> {"Dhcp4": {
> "interfaces-config": {"interfaces": ["eth0"]},
> "authoritative": true,
> "multi-threading": {
> "packet-queue-size": 16,
> "enable-multi-threading": true,
> "thread-pool-size": 4
> },
> "loggers": [{
> "debuglevel": 55,
> "severity": "DEBUG",
> "output_options": [{
> "output": "/var/log/kea-dhcp4.log",
> "flush": true,
> "maxsize": 204800
> }],
> "name": "kea-dhcp4"
> }],
> "lease-database": {
> "name": "/opt/dhcp/dhcp/db/dhcp4.leases",
> "persist": true,
> "type": "memfile",
> "lfc-interval":60,
> },
> "hooks-libraries": [{"library": "/opt/dhcp/lib/kea/hooks/libdhcp_lease_cmds.so"}],
> "server-hostname": "server-47",
> "control-socket": {
> "socket-type": "unix",
> "socket-name": "/opt/dhcp/dhcp/kea4-ctrl-socket"
> },
> "decline-probation-period": 7200,
> "sanity-checks": {"lease-checks": "fix-del"},
> "subnet4": [{
> "subnet": "3.0.0.0/8",
> "valid-lifetime": 86400,
> "option-data": [
> {
> "data": "www.shobhith.com",
> "name": "domain-name"
> },
> {
> "data": "86400",
> "name": "dhcp-lease-time"
> },
> {
> "data": "255.0.0.0",
> "name": "subnet-mask"
> },
> {
> "data": "3.0.0.1",
> "name": "routers"
> }
> ],
> "pools": [{
> "client-class": "allow-client",
> "pool": "3.0.0.50-3.0.0.100"
> }],
> "id": 818110
> }],
> "client-classes": [
> {"name": "deny-client"},
> {
> "test": "(not(member('deny-client')))",
> "name": "allow-client"
> }
> ]
> }}
> Thank you.
>
> On Thu, 8 Jun 2023 at 17:44, Darren Ankney <darren.ankney at gmail.com> wrote:
>>
>> Hi Shobhith,
>>
>> It is difficult to answer without seeing your Kea configuration.
>> Speculation would be that the lease is in memory and either not being
>> recorded to the file or was removed from the file somehow? When using
>> 'memfile' for lease storage, the leases are actually in memory. The
>> file is only a record that Kea can use to read the leases back into
>> memory in the case it is restarted. Its possible to setup memfile,
>> set a filename, and not have leases written to the file if you have
>> "persist": false in the lease-database configuration.
>>
>> Thank you,
>>
>> Darren Ankney
>>
>> On Thu, Jun 8, 2023 at 7:10 AM Shobhith Chikku <shobhithchikku at gmail.com> wrote:
>> >
>> > Hi,
>> > When I am trying to fetch active leases, even though my lease file is empty, I am getting leases when I execute
>> > /usr/bin/echo '{"command":"lease4-get-all"}' | /usr/bin/socat - UNIX:/opt/tcpwave/timsdhcp/kea4-ctrl-socket | /usr/bin/jq
>> > Below mentioned is my lease file
>> > cat /opt/test/dhcp/db/dhcp4.leases
>> > address,hwaddr,client_id,valid_lifetime,expire,subnet_id,fqdn_fwd,fqdn_rev,hostname,state,user_context
>> > When I execute lease4-get-all command, I get leases
>> > {
>> > "arguments": {
>> > "leases": [
>> > {
>> > "client-id": "01:2f:ff:ff:00:00:01",
>> > "cltt": 1686215869,
>> > "fqdn-fwd": false,
>> > "fqdn-rev": false,
>> > "hostname": "dhcp-client-000001",
>> > "hw-address": "2f:ff:ff:00:00:01",
>> > "ip-address": "3.0.0.2",
>> > "state": 0,
>> > "subnet-id": 818110,
>> > "valid-lft": 86400
>> > } ]
>> > },
>> > "result": 0,
>> > "text": "10 IPv4 lease(s) found."
>> > }
>> > Where am I getting this from?
>> > Thanks in advance
>> > Shobhith
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