[Kea-users] Fetching Active Leases

[Shobhith Chikku]

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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