[Kea-users] kea-lfc not using KEA_LOCKFILE_DIR

[Darren Ankney]

Hi Martijn,

Looking in the ARM, I only find KEA_LOCKFILE_DIR mentioned here:
https://kea.readthedocs.io/en/kea-2.4.1/arm/logging.html#logging-during-kea-startup
which pertains only to controlling destination of logging while Kea is
starting up (before it has read the configuration file completely).
These environment variables don't seem to have anything to do with
`kea-lfc`.  Can you point to where you saw that `kea-lfc` should
respect these environment variables?

Thank you,
Darren Ankney

On Tue, Jun 4, 2024 at 10:43 AM Martijn via Kea-users
<kea-users at lists.isc.org> wrote:
>
> Hi,
>
> We are currently implementing Kea for a multi tenant/VRF scenario. We do this by running multiple instances of kea-dhcp4 with a systemd unit template. Because we have multiple Kea instances running, we need separate folders for storing PIDs, lock files and configs. So far, this is working fine. The Kea service is running, establishing HA session and serving requests.
>
> We just have a problem with the periodic lease file cleaning performed by kea-lfc, while the lease file cleanup seems to be successful. It is logging errors relating to using a lock file for the logger.
>
> Jun 04 15:49:27 dhcp-01 kea-dhcp4-VRF039[1395]: INFO  DHCPSRV_MEMFILE_LFC_START starting Lease File Cleanup
> Jun 04 15:49:27 dhcp-01 kea-dhcp4-VRF039[1395]: INFO  DHCPSRV_MEMFILE_LFC_EXECUTE executing Lease File Cleanup using: /usr/sbin/kea-lfc -4 -x /var/lib/kea-VRF039/dhcp4.leases.2 -i /var/lib/kea-VRF039/dhcp4.leases.1 -o /var/lib/kea-VRF039/dhcp4.leases.output -f /var/lib/kea-VRF039/dhcp4.leases.completed -p /var/lib/kea-VRF039/dhcp4.leases.pid -c ignored-path
> Jun 04 15:49:28 dhcp-01 kea-dhcp4-VRF039[2571]: Unable to use interprocess sync lockfile (No such file or directory): /var/run/kea/logger_lockfile
> Jun 04 15:49:28 dhcp-01 kea-dhcp4-VRF039[2571]: Unable to use interprocess sync lockfile (No such file or directory): /var/run/kea/logger_lockfile
> ---- 6 more identical messages ----
>
> I have tried manually running the process with the specified arguments from the log message and setting the KEA_LOCKFILE_DIR environment variable. However, kea-lfc still doesn’t seem to use the environment variable.
>
> $ export KEA_LOCKFILE_DIR=/run/lock/kea-VRF039
> $ echo $KEA_LOCKFILE_DIR
> /run/lock/kea-VRF039
>
> $ sudo -u _kea -g _kea \
>     /usr/sbin/kea-lfc -4 \
>     -x /var/lib/kea-VRF039/dhcp4.leases.2 \
>     -i /var/lib/kea-VRF039/dhcp4.leases.1 \
>     -o /var/lib/kea-VRF039/dhcp4.leases.output \
>     -f /var/lib/kea-VRF039/dhcp4.leases.completed \
>     -p /var/lib/kea-VRF039/dhcp4.leases.pid \
>     -c ignored-path
>
> Unable to use interprocess sync lockfile (No such file or directory): /var/run/kea/logger_lockfile
> Unable to use interprocess sync lockfile (No such file or directory): /var/run/kea/logger_lockfile
> Unable to use interprocess sync lockfile (No such file or directory): /var/run/kea/logger_lockfile
> Unable to use interprocess sync lockfile (No such file or directory): /var/run/kea/logger_lockfile
> Unable to use interprocess sync lockfile (No such file or directory): /var/run/kea/logger_lockfile
> Unable to use interprocess sync lockfile (No such file or directory): /var/run/kea/logger_lockfile
> Unable to use interprocess sync lockfile (No such file or directory): /var/run/kea/logger_lockfile
>
>
> I have read through the code and it seems like the environment variable should be used. So I am not sure what’s going wrong. I have found an issue on the nixpkgs GitHub which seems to describe the same issue (kea-lfc not using KEA_LOCKFILE_DIR) https://github.com/NixOS/nixpkgs/issues/265826
>
> Is this a known issue or am I doing something wrong?
>
> Some additional info:
> Distro: Ubuntu 24.04 LTS
> Using the package from ubuntu APT sources:
> Package: kea-dhcp4-server
> Version: 2.4.1-3build3
>
>
> Regards,
>
> Martijn
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