[Kea-users] kea-lfc not using KEA_LOCKFILE_DIR

[martijnremmen at icloud.com]

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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