Hello everyone,
I am running an HA (hot standby) Kea setup in Kubernetes. I do not want to
hard-code service IPs, so I switched to headless services instead, hoping to be
able to provide (fest) hostnames in the HA configuration:
[…]
"parameters": {
"high-availability": [
{
"this-server-name": "secondary",
"mode": "hot-standby",
"heartbeat-interval": 1,
"max-response-delay": 6,
"max-ack-delay": 1,
"max-unacked-messages": 0,
"max-unacked-clients": 0,
"peers": [
{
"name": "primary",
"url": "http://dhcp-prim-headless-svc:8000/“, <- does not seem to
be supported
"role": "primary",
"auto-failover": true
},
{
"name": "secondary",
"url": "http://dhcp-second-headless-svc:8000/“, <- same here
"role": "standby",
"auto-failover": true
}
]
}
]
}
[…]
However, the Kea container fails to start with the error message that the
address cannot be resolved:
363 18:16:52.313 kea-dhcp4.hooks HOOKS_STD_CALLOUT_REGISTERED hooks library
/usr/lib/x86_64-linux-gnu/kea/hooks/libdhcp_ha.so registered standard callout
for hook leases4_committed at address 0x7f20d4739360
363 18:16:52.313 kea-dhcp4.ha-hooks HA_CONFIGURATION_FAILED failed to configure
High Availability hooks library: bad url 'http://dhcp-prim-headless-svc:8000/':
Failed to convert string to address
'dhcp-prim-headless-svc':
Invalid argument for server primary
363 18:16:52.313 kea-dhcp4.hooks HOOKS_LOAD_ERROR 'load' function in hook
library /usr/lib/x86_64-linux-gnu/kea/hooks/libdhcp_ha.so returned error 1
The headless service is perfectly pingable from other containers in the pod, so
no DNS general problem there.
I also stumbled upon a unit test, indicating that hostnames are not supported
in the configuration,
https://gitlab.isc.org/isc-projects/kea/-/blob/master/src/hooks/dhcp/high_availability/tests/ha_config_unittest.cc#L651-L677.
However, the HA design document,
https://gitlab.isc.org/isc-projects/kea/-/wikis/designs/High-Availability-Design,
clearly *has* hostnames in its showcase configuration.
So, can someone, kindly, hint me if that’s supported or not? If the latter is
the case, I will just open a feature request.
For the developers: thanks for the great work, keep it up!
Best,
Damyan Y.
Damyan Yordanov
BTP Core FP R Gardener (SE)
SAP SE, Dietmar-Hopp-Allee 16, 69190 Walldorf, Germany
T +49 6227 7-65764, M +49 160 90 842 652,
damyan.yorda...@sap.com
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