[kea_2.4.0]New monitor interface added in kea conf but dhcp4 server can't detect the new added interface

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Describe the bug New monitor interface added in kea conf file but dhcp4 server can't detect the new added interface.

To Reproduce In our project we used kea as our dhcp server and did some second develop work. Below test scenario failed after upgrade kea from 2.2.0 to 2.4.0. Steps to reproduce the behavior:

1. Prepare kea conf file and until waiting one running interface to start dhcp4 server. In this place we can find fhmintbre in RUNNING state and dhcp4server also startup normally.
2. After step1, a new interface fhmintbrc become running,then our service prepare one new conf file, in this file interface parameter with both fhmintbre and fhmintbrc.
3. Because kea conf file update in our code logical, we need to reload dhcp4server, after reload the dhcp4server can't start. the log info as "Failed to selecnterface: interface 'fhmintbrc' doesn't exist in the system (/tmp/kea-dhcp4.conf:42:17)" Seems dhcp4server still used the old conf file didn't get the new conf with fhmintbrc info.

This scenario case work normally in kea 2.2.0. Can you help to check this issue?

Expected behavior dhcp4server startup should use the latest kea-dhcp.conf file after new running interface added, but now we found dhcp4server still used the old copy.

Environment:

• Kea version: kea 2.4.0
• OS: [e.g. Ubuntu 16.04 x64]
• Which features were compiled in (in particular which backends)
• If/which hooks where loaded in

Additional Information Log info print in our env:

<14>1 2023-08-22T15:23:36.905286+08:00 nescran6-dhcp-server-0 dhcpmanager 9 - - Send dhcp readiness ack: status(SUCCESS):0, hoste: nescran6-dhcp-server-0
<15>1 2023-08-22T15:23:38.584740+08:00 nescran6-dhcp-server-0 dhcpmanager 9 - - Readiness fd reveived (IN) callback.
<15>1 2023-08-22T15:23:38.584831+08:00 nescran6-dhcp-server-0 dhcpmanager 9 - - hwinfoprovider data provider callback, path: [/na-hwinfo:hwinfo], request_xpath: [/nokia-hwinfo:hwinfo], module: [nokia-hwinfo]
<14>1 2023-08-22T15:23:38.584865+08:00 nescran6-dhcp-server-0 dhcpmanager 9 - - hwinfoprovider data provider: [{"nokia-hwinfo:hwo":{"readiness":[{"owner":"nescran6-dhcp-server-0","check-list":[0,1,2],"states":[{"type":2,"last-updated":"2023-08-22T23:23:36.900+08:00"}]}]}}]
<14>1 2023-08-22T15:26:18.863022+08:00 nescran6-dhcp-server-0 dhcpmanager 9 - - netlink: interface(name:fhmintune0, index:6) upd event. flags:4098
<14>1 2023-08-22T15:26:18.863130+08:00 nescran6-dhcp-server-0 dhcpmanager 9 - - netlink: interface(name:fhmintune0, index:6) upd event. flags:4098
<14>1 2023-08-22T15:26:18.970545+08:00 nescran6-dhcp-server-0 dhcpmanager 9 - - netlink: interface(name:fhmintune0, index:6) upd event. flags:69699
<14>1 2023-08-22T15:26:19.305565+08:00 nescran6-dhcp-server-0 dhcpmanager 9 - - netlink: interface(name:fhmintbre, index:7) updaevent. flags:4098
<14>1 2023-08-22T15:26:19.879863+08:00 nescran6-dhcp-server-0 dhcpmanager 9 - - netlink: interface(name:fhmintune0, index:6) upd event. flags:69699
<14>1 2023-08-22T15:26:19.879984+08:00 nescran6-dhcp-server-0 dhcpmanager 9 - - netlink: interface(name:fhmintune0, index:6) upd event. flags:69699
<14>1 2023-08-22T15:26:19.880041+08:00 nescran6-dhcp-server-0 dhcpmanager 9 - - netlink: interface(name:fhmintbre, index:7) updaevent. flags:4098
<14>1 2023-08-22T15:26:19.880094+08:00 nescran6-dhcp-server-0 dhcpmanager 9 - - netlink: interface(name:fhmintbre, index:7) updaevent. flags:4098
<14>1 2023-08-22T15:26:19.880160+08:00 nescran6-dhcp-server-0 dhcpmanager 9 - - netlink: interface(name:fhmintbre, index:7) updaevent. flags:4098
<14>1 2023-08-22T15:26:20.473274+08:00 nescran6-dhcp-server-0 dhcpmanager 9 - - netlink: ip address(iface index:7) update event.ags:128
<14>1 2023-08-22T15:26:21.205540+08:00 nescran6-dhcp-server-0 dhcpmanager 9 - - netlink: interface(name:fhmintbre, index:7) updaevent. flags:69635
<14>1 2023-08-22T15:26:21.205630+08:00 nescran6-dhcp-server-0 dhcpmanager 9 - - netlink: interface(name:fhmintbre, index:7) updaevent. flags:69699
<14>1 2023-08-22T15:26:21.205691+08:00 nescran6-dhcp-server-0 dhcpmanager 9 - - Interface index(7) sate change to RUNNING
<14>1 2023-08-22T15:26:22.908112+08:00 nescran6-dhcp-server-0 dhcpmanager 9 - - DHCP server inactive.
<14>1 2023-08-22T15:26:23.005806+08:00 nescran6-dhcp-server-0 dhcpmanager 9 - - Start dhcp4 server success with cmd: genapiloggeat --ident dhcp4server -- /usr/sbin/kea-dhcp4 -c /tmp/kea-dhcp4.conf &
<14>1 2023-08-22T15:26:23.905870+08:00 nescran6-dhcp-server-0 dhcp4server 455 - - 2023-08-22 15:26:23.905 INFO  [kea-dhcp4.dhcp43.140102015412096] DHCP4_STARTING Kea DHCPv4 server version 2.4.0 (stable) starting
<14>1 2023-08-22T15:26:23.907140+08:00 nescran6-dhcp-server-0 dhcp4server 455 - - 2023-08-22 15:26:23.907 INFO  [kea-dhcp4.hosts3.140102015412096] HOSTS_BACKENDS_REGISTERED the following host backend types are available: postgresql
<14>1 2023-08-22T15:26:23.907517+08:00 nescran6-dhcp-server-0 dhcp4server 455 - - 2023-08-22 15:26:23.907 INFO  [kea-dhcp4.dhcps463.140102015412096] DHCPSRV_CFGMGR_ADD_IFACE listening on interface fhmintbre
<14>1 2023-08-22T15:26:23.907550+08:00 nescran6-dhcp-server-0 dhcp4server 455 - - 2023-08-22 15:26:23.907 INFO  [kea-dhcp4.dhcps463.140102015412096] DHCPSRV_CFGMGR_SOCKET_TYPE_DEFAULT "dhcp-socket-type" not specified , using default socket type raw
<14>1 2023-08-22T15:26:23.908007+08:00 nescran6-dhcp-server-0 dhcp4server 455 - - 2023-08-22 15:26:23.907 INFO  [kea-dhcp4.hooks3.140102015412096] HOOKS_LIBRARY_CLOSED hooks library /usr/lib64/libkea4hook.so successfully closed
<14>1 2023-08-22T15:26:23.908186+08:00 nescran6-dhcp-server-0 dhcp4server 455 - - 2023-08-22 15:26:23.908 WARN  [kea-dhcp4.dhcps463.140102015412096] DHCPSRV_CONFIGURED_SUBNET_WITHOUT_ID a subnet was configured without an id: 50.50.0.0/24
<14>1 2023-08-22T15:26:23.908205+08:00 nescran6-dhcp-server-0 dhcp4server 455 - - 2023-08-22 15:26:23.908 INFO  [kea-dhcp4.dhcps463.140102015412096] DHCPSRV_CFGMGR_NEW_SUBNET4 a new subnet has been added to configuration: 50.50.0.0/24 with params: valid-liime=300
<14>1 2023-08-22T15:26:23.908328+08:00 nescran6-dhcp-server-0 dhcp4server 455 - - 2023-08-22 15:26:23.908 INFO  [kea-dhcp4.dhcps463.140102015412096] DHCPSRV_CFGMGR_NEW_SUBNET4 a new subnet has been added to configuration: 50.50.1.0/24 with params: valid-liime=300
<14>1 2023-08-22T15:26:23.908421+08:00 nescran6-dhcp-server-0 dhcp4server 455 - - 2023-08-22 15:26:23.908 INFO  [kea-dhcp4.dhcps463.140102015412096] DHCPSRV_CFGMGR_NEW_SUBNET4 a new subnet has been added to configuration: 50.50.2.0/24 with params: valid-liime=300
<14>1 2023-08-22T15:26:23.908511+08:00 nescran6-dhcp-server-0 dhcp4server 455 - - 2023-08-22 15:26:23.908 INFO  [kea-dhcp4.dhcps463.140102015412096] DHCPSRV_CFGMGR_NEW_SUBNET4 a new subnet has been added to configuration: 50.50.3.0/24 with params: valid-liime=300
<14>1 2023-08-22T15:26:24.005271+08:00 nescran6-dhcp-server-0 dhcp4server 455 - - 2023-08-22 15:26:24.005 INFO  [kea-dhcp4.dhcps463.140102015412096] DHCPSRV_CFGMGR_NEW_SUBNET4 a new subnet has been added to configuration: 50.50.4.0/24 with params: valid-liime=300
<14>1 2023-08-22T15:26:24.005454+08:00 nescran6-dhcp-server-0 dhcp4server 455 - - 2023-08-22 15:26:24.005 INFO  [kea-dhcp4.dhcps463.140102015412096] DHCPSRV_CFGMGR_NEW_SUBNET4 a new subnet has been added to configuration: 50.50.5.0/24 with params: valid-liime=300
<14>1 2023-08-22T15:26:24.005638+08:00 nescran6-dhcp-server-0 dhcp4server 455 - - 2023-08-22 15:26:24.005 INFO  [kea-dhcp4.dhcps463.140102015412096] DHCPSRV_CFGMGR_NEW_SUBNET4 a new subnet has been added to configuration: 50.50.6.0/24 with params: valid-liime=300
<14>1 2023-08-22T15:26:24.005809+08:00 nescran6-dhcp-server-0 dhcp4server 455 - - 2023-08-22 15:26:24.005 INFO  [kea-dhcp4.dhcps463.140102015412096] DHCPSRV_CFGMGR_NEW_SUBNET4 a new subnet has been added to configuration: 60.60.1.0/24 with params: valid-liime=300
<14>1 2023-08-22T15:26:24.006040+08:00 nescran6-dhcp-server-0 dhcp4server 455 - - 2023-08-22 15:26:24.006 INFO  [kea-dhcp4.dhcps463.140102015412096] DHCPSRV_CFGMGR_SOCKET_TYPE_SELECT using socket type raw
<14>1 2023-08-22T15:26:24.006528+08:00 nescran6-dhcp-server-0 dhcp4server 455 - - 2023-08-22 15:26:24.006 INFO  [kea-dhcp4.dhcps463.140102015412096] DHCPSRV_CFGMGR_ADD_IFACE listening on interface fhmintbre
<14>1 2023-08-22T15:26:24.006563+08:00 nescran6-dhcp-server-0 dhcp4server 455 - - 2023-08-22 15:26:24.006 INFO  [kea-dhcp4.dhcps463.140102015412096] DHCPSRV_CFGMGR_SOCKET_TYPE_DEFAULT "dhcp-socket-type" not specified , using default socket type raw
<14>1 2023-08-22T15:26:24.007242+08:00 nescran6-dhcp-server-0 dhcp4server 455 - - 2023-08-22 15:26:24.007 INFO  [kea-dhcp4.hooks3.140102015412096] HOOKS_LIBRARY_LOADED hooks library /usr/lib64/libkea4hook.so successfully loaded
<14>1 2023-08-22T15:26:24.007270+08:00 nescran6-dhcp-server-0 dhcp4server 455 - - 2023-08-22 15:26:24.007 INFO  [kea-dhcp4.dhcp43.140102015412096] DHCP4_CONFIG_COMPLETE DHCPv4 server has completed configuration: added IPv4 subnets: 8; DDNS: disabled
<14>1 2023-08-22T15:26:24.107592+08:00 nescran6-dhcp-server-0 dhcp4server 455 - - 2023-08-22 15:26:24.107 INFO  [kea-dhcp4.dhcps463.140102015412096] DHCPSRV_MEMFILE_DB opening memory file lease database: lfc-interval=3600 max-row-errors=100 name=/var/log/kleasesdb/kea-leases4.csv persist=true type=memfile universe=4
<14>1 2023-08-22T15:26:24.207168+08:00 nescran6-dhcp-server-0 dhcp4server 455 - - 2023-08-22 15:26:24.207 INFO  [kea-dhcp4.dhcps463.140102015412096] DHCPSRV_MEMFILE_LEASE_FILE_LOAD loading leases from file /var/log/kea-leasesdb/kea-leases4.csv
<14>1 2023-08-22T15:26:24.229966+08:00 nescran6-dhcp-server-0 dhcp4server 455 - - 2023-08-22 15:26:24.229 INFO  [kea-dhcp4.dhcps463.140102015412096] DHCPSRV_MEMFILE_EXTRACT_EXTENDED_INFO4 extracting extended info saw 0 leases, extended info sanity checks mfied 0 / updated 0 leases and 0 leases have relay or remote id
<14>1 2023-08-22T15:26:24.229991+08:00 nescran6-dhcp-server-0 dhcp4server 455 - - 2023-08-22 15:26:24.229 INFO  [kea-dhcp4.dhcps463.140102015412096] DHCPSRV_MEMFILE_LFC_SETUP setting up the Lease File Cleanup interval to 3600 sec
<14>1 2023-08-22T15:26:24.313526+08:00 nescran6-dhcp-server-0 dhcp4server 455 - - 2023-08-22 15:26:24.313 INFO  [kea-dhcp4.dhcps463.140102015412096] DHCPSRV_CFGMGR_USE_ALLOCATOR using the iterative allocator for V4 leases in subnet 50.50.0.0/24
<14>1 2023-08-22T15:26:24.313558+08:00 nescran6-dhcp-server-0 dhcp4server 455 - - 2023-08-22 15:26:24.313 INFO  [kea-dhcp4.dhcps463.140102015412096] DHCPSRV_CFGMGR_USE_ALLOCATOR using the iterative allocator for V4 leases in subnet 50.50.1.0/24
<14>1 2023-08-22T15:26:24.313576+08:00 nescran6-dhcp-server-0 dhcp4server 455 - - 2023-08-22 15:26:24.313 INFO  [kea-dhcp4.dhcps463.140102015412096] DHCPSRV_CFGMGR_USE_ALLOCATOR using the iterative allocator for V4 leases in subnet 50.50.2.0/24
<14>1 2023-08-22T15:26:24.313590+08:00 nescran6-dhcp-server-0 dhcp4server 455 - - 2023-08-22 15:26:24.313 INFO  [kea-dhcp4.dhcps463.140102015412096] DHCPSRV_CFGMGR_USE_ALLOCATOR using the iterative allocator for V4 leases in subnet 50.50.3.0/24
<14>1 2023-08-22T15:26:24.313604+08:00 nescran6-dhcp-server-0 dhcp4server 455 - - 2023-08-22 15:26:24.313 INFO  [kea-dhcp4.dhcps463.140102015412096] DHCPSRV_CFGMGR_USE_ALLOCATOR using the iterative allocator for V4 leases in subnet 50.50.4.0/24
<14>1 2023-08-22T15:26:24.313618+08:00 nescran6-dhcp-server-0 dhcp4server 455 - - 2023-08-22 15:26:24.313 INFO  [kea-dhcp4.dhcps463.140102015412096] DHCPSRV_CFGMGR_USE_ALLOCATOR using the iterative allocator for V4 leases in subnet 50.50.5.0/24
<14>1 2023-08-22T15:26:24.313639+08:00 nescran6-dhcp-server-0 dhcp4server 455 - - 2023-08-22 15:26:24.313 INFO  [kea-dhcp4.dhcps463.140102015412096] DHCPSRV_CFGMGR_USE_ALLOCATOR using the iterative allocator for V4 leases in subnet 50.50.6.0/24
<14>1 2023-08-22T15:26:24.313654+08:00 nescran6-dhcp-server-0 dhcp4server 455 - - 2023-08-22 15:26:24.313 INFO  [kea-dhcp4.dhcps463.140102015412096] DHCPSRV_CFGMGR_USE_ALLOCATOR using the iterative allocator for V4 leases in subnet 60.60.1.0/24
<14>1 2023-08-22T15:26:24.314034+08:00 nescran6-dhcp-server-0 dhcp4server 455 - - 2023-08-22 15:26:24.313 WARN  [kea-dhcp4.dhcp43.140102015412096] DHCP4_MULTI_THREADING_INFO enabled: no, number of threads: 0, queue size: 0
<14>1 2023-08-22T15:26:24.314114+08:00 nescran6-dhcp-server-0 dhcp4server 455 - - 2023-08-22 15:26:24.314 INFO  [kea-dhcp4.dhcp43.140102015412096] DHCP4_STARTED Kea DHCPv4 server version 2.4.0 started
<14>1 2023-08-22T15:26:24.314292+08:00 nescran6-dhcp-server-0 dhcp4server 455 - - 2023-08-22 15:26:24.314 ERROR [kea-dhcp4.packe463.140102015412096] DHCP4_BUFFER_RECEIVE_FAIL error on attempt to receive packet: Truncated DHCPv4 packet (len=55) received, atast 236 is expected.
<14>1 2023-08-22T15:26:24.314346+08:00 nescran6-dhcp-server-0 dhcp4server 455 - - 2023-08-22 15:26:24.314 ERROR [kea-dhcp4.packe463.140102015412096] DHCP4_BUFFER_RECEIVE_FAIL error on attempt to receive packet: Truncated DHCPv4 packet (len=108) received, aeast 236 is expected.
<14>1 2023-08-22T15:26:24.314430+08:00 nescran6-dhcp-server-0 dhcp4server 455 - - 2023-08-22 15:26:24.314 ERROR [kea-dhcp4.packe463.140102015412096] DHCP4_BUFFER_RECEIVE_FAIL error on attempt to receive packet: Truncated DHCPv4 packet (len=32) received, atast 236 is expected.
<14>1 2023-08-22T15:26:24.314487+08:00 nescran6-dhcp-server-0 dhcp4server 455 - - 2023-08-22 15:26:24.314 ERROR [kea-dhcp4.packe463.140102015412096] DHCP4_BUFFER_RECEIVE_FAIL error on attempt to receive packet: Truncated DHCPv4 packet (len=12) received, atast 236 is expected.
<14>1 2023-08-22T15:26:35.569350+08:00 nescran6-dhcp-server-0 dhcpmanager 9 - - netlink: interface(name:fhmintunc0, index:8) upd event. flags:4098
<14>1 2023-08-22T15:26:35.569495+08:00 nescran6-dhcp-server-0 dhcpmanager 9 - - netlink: interface(name:fhmintunc0, index:8) upd event. flags:4098
<14>1 2023-08-22T15:26:35.672859+08:00 nescran6-dhcp-server-0 dhcpmanager 9 - - netlink: interface(name:fhmintunc0, index:8) upd event. flags:69699
<14>1 2023-08-22T15:26:35.977884+08:00 nescran6-dhcp-server-0 dhcpmanager 9 - - netlink: interface(name:fhmintbrc, index:9) updaevent. flags:4098
<14>1 2023-08-22T15:26:36.505480+08:00 nescran6-dhcp-server-0 dhcpmanager 9 - - netlink: interface(name:fhmintbrc, index:9) updaevent. flags:69699
<14>1 2023-08-22T15:26:36.505604+08:00 nescran6-dhcp-server-0 dhcpmanager 9 - - Interface index(9) sate change to RUNNING
<14>1 2023-08-22T15:26:37.270782+08:00 nescran6-dhcp-server-0 dhcpmanager 9 - - netlink: interface(name:fhmintunc0, index:8) upd event. flags:69699
<14>1 2023-08-22T15:26:37.305261+08:00 nescran6-dhcp-server-0 dhcpmanager 9 - - netlink: interface(name:fhmintunc0, index:8) upd event. flags:69699
<14>1 2023-08-22T15:26:37.305334+08:00 nescran6-dhcp-server-0 dhcpmanager 9 - - netlink: interface(name:fhmintbrc, index:9) updaevent. flags:69699
<14>1 2023-08-22T15:26:37.305384+08:00 nescran6-dhcp-server-0 dhcpmanager 9 - - netlink: interface(name:fhmintbrc, index:9) updaevent. flags:69699
<14>1 2023-08-22T15:26:37.305439+08:00 nescran6-dhcp-server-0 dhcpmanager 9 - - netlink: interface(name:fhmintbrc, index:9) updaevent. flags:69699
<14>1 2023-08-22T15:26:37.305482+08:00 nescran6-dhcp-server-0 dhcpmanager 9 - - netlink: interface(name:fhmintbrc, index:9) updaevent. flags:69699
<14>1 2023-08-22T15:26:37.965480+08:00 nescran6-dhcp-server-0 dhcpmanager 9 - - netlink: ip address(iface index:9) update event.ags:128
dhcpmanager[9]: INFO/keactrl: Reloading kea-dhcp4...
<14>1 2023-08-22T15:26:38.907204+08:00 nescran6-dhcp-server-0 dhcp4server 455 - - 2023-08-22 15:26:38.907 INFO  [kea-dhcp4.dhcp43.140102015412096] DHCP4_DYNAMIC_RECONFIGURATION initiate server reconfiguration using file: /tmp/kea-dhcp4.conf, after receivinIGHUP signal or config-reload command
<14>1 2023-08-22T15:26:38.907997+08:00 nescran6-dhcp-server-0 dhcp4server 455 - - 2023-08-22 15:26:38.907 INFO  [kea-dhcp4.hosts3.140102015412096] HOSTS_BACKENDS_REGISTERED the following host backend types are available: postgresql
<14>1 2023-08-22T15:26:39.005586+08:00 nescran6-dhcp-server-0 dhcp4server 455 - - 2023-08-22 15:26:39.005 ERROR [kea-dhcp4.dhcp43.140102015412096] DHCP4_PARSER_FAIL failed to create or run parser for configuration element interfaces-config: Failed to selecnterface: interface 'fhmintbrc' doesn't exist in the system (/tmp/kea-dhcp4.conf:42:17) (/tmp/kea-dhcp4.conf:40:13)
<14>1 2023-08-22T15:26:39.005683+08:00 nescran6-dhcp-server-0 dhcp4server 455 - - 2023-08-22 15:26:39.005 FATAL [kea-dhcp4.dhcp43.140102015412096] DHCP4_CONFIG_UNRECOVERABLE_ERROR DHCPv4 server new configuration failed with an error which cannot be recover
<14>1 2023-08-22T15:26:39.005752+08:00 nescran6-dhcp-server-0 dhcp4server 455 - - 2023-08-22 15:26:39.005 ERROR [kea-dhcp4.dhcp43.140102015412096] DHCP4_CONFIG_LOAD_FAIL configuration error using file: /tmp/kea-dhcp4.conf, reason: Failed to select interfacinterface 'fhmintbrc' doesn't exist in the system (/tmp/kea-dhcp4.conf:42:17) (/tmp/kea-dhcp4.conf:40:13)
<14>1 2023-08-22T15:26:39.005943+08:00 nescran6-dhcp-server-0 dhcp4server 455 - - 2023-08-22 15:26:39.005 FATAL [kea-dhcp4.dhcp43.140102015412096] DHCP4_DYNAMIC_RECONFIGURATION_FAIL dynamic server reconfiguration failed with file: /tmp/kea-dhcp4.conf
dhcpmanager[9]: INFO/keactrl: kea-dhcp6 isn't running.
dhcpmanager[9]: INFO/keactrl: kea-dhcp-ddns isn't running.
dhcpmanager[9]: INFO/keactrl: kea-ctrl-agent isn't running.
<14>1 2023-08-22T15:26:40.007603+08:00 nescran6-dhcp-server-0 dhcpmanager 9 - - Reload dhcp4 server success with cmd: /usr/sbin/ctrl reload -c /tmp/keactrl.conf
dhcpmanager[9]: INFO/keactrl: Reloading kea-dhcp4...
<14>1 2023-08-22T15:26:43.008206+08:00 nescran6-dhcp-server-0 dhcp4server 455 - - 2023-08-22 15:26:43.008 INFO  [kea-dhcp4.dhcp43.140102015412096] DHCP4_DYNAMIC_RECONFIGURATION initiate server reconfiguration using file: /tmp/kea-dhcp4.conf, after receivinIGHUP signal or config-reload command
<14>1 2023-08-22T15:26:43.009047+08:00 nescran6-dhcp-server-0 dhcp4server 455 - - 2023-08-22 15:26:43.008 INFO  [kea-dhcp4.hosts3.140102015412096] HOSTS_BACKENDS_REGISTERED the following host backend types are available: postgresql
<14>1 2023-08-22T15:26:43.105606+08:00 nescran6-dhcp-server-0 dhcp4server 455 - - 2023-08-22 15:26:43.105 ERROR [kea-dhcp4.dhcp43.140102015412096] DHCP4_PARSER_FAIL failed to create or run parser for configuration element interfaces-config: Failed to selecnterface: interface 'fhmintbrc' doesn't exist in the system (/tmp/kea-dhcp4.conf:42:17) (/tmp/kea-dhcp4.conf:40:13)
<14>1 2023-08-22T15:26:43.105632+08:00 nescran6-dhcp-server-0 dhcp4server 455 - - 2023-08-22 15:26:43.105 FATAL [kea-dhcp4.dhcp43.140102015412096] DHCP4_CONFIG_UNRECOVERABLE_ERROR DHCPv4 server new configuration failed with an error which cannot be recover
<14>1 2023-08-22T15:26:43.205210+08:00 nescran6-dhcp-server-0 dhcp4server 455 - - 2023-08-22 15:26:43.105 ERROR [kea-dhcp4.dhcp43.140102015412096] DHCP4_CONFIG_LOAD_FAIL configuration error using file: /tmp/kea-dhcp4.conf, reason: Failed to select interfacinterface 'fhmintbrc' doesn't exist in the system (/tmp/kea-dhcp4.conf:42:17) (/tmp/kea-dhcp4.conf:40:13)
<14>1 2023-08-22T15:26:43.205239+08:00 nescran6-dhcp-server-0 dhcp4server 455 - - 2023-08-22 15:26:43.105 FATAL [kea-dhcp4.dhcp43.140102015412096] DHCP4_DYNAMIC_RECONFIGURATION_FAIL dynamic server reconfiguration failed with file: /tmp/kea-dhcp4.conf
dhcpmanager[9]: INFO/keactrl: kea-dhcp6 isn't running.
dhcpmanager[9]: INFO/keactrl: kea-dhcp-ddns isn't running.
dhcpmanager[9]: INFO/keactrl: kea-ctrl-agent isn't running.

Contacting you sijie.chen@nokia-sbell.com

Andrei: edited the Additional Information section to be readable.