[Kea-users] keas-dhcp failover and HA
Kraishak Mahtha
kraishak.edu at gmail.com
Mon Mar 6 12:51:42 UTC 2023
ok Thanks for confirmation Darren
On Mon, Mar 6, 2023 at 4:16 PM Darren Ankney <darren.ankney at gmail.com>
wrote:
> neither of those configs are valid. Looks like ChatGPT made up some
> things there. See:
>
> https://kea.readthedocs.io/en/kea-2.2.0/arm/hooks.html#ha-high-availability-outage-resilience-for-kea-servers
>
> Take a look at hot-standby as that is the easiest mode to configure and
> operate.
>
> On Mon, Mar 6, 2023 at 12:35 AM Kraishak Mahtha <kraishak.edu at gmail.com>
> wrote:
> >
> > Hi All,
> > I have recently started exploring kea-dhcp4, while I am checking for the
> kea-dhcp failover on chatGPT, It says that failover and HA are two
> different mechanisms for the kea and here is the sample example for
> kea-failover config as it provides
> > # Sample config for failover
> > ================
> > {
> > "Dhcp4": {
> > "control-socket": {
> > "socket-type": "unix",
> > "socket-name": "/tmp/kea-dhcp4-ctrl.sock"
> > },
> > "lease-database": {
> > "type": "memfile",
> > "lfc-interval": 3600
> > },
> > "expired-leases-processing": {
> > "reclaim-timer-wait-time": 10,
> > "flush-reclaimed-timer-wait-time": 25,
> > "hold-reclaimed-time": 3600,
> > "max-reclaim-leases": 100,
> > "max-reclaim-time": 250,
> > "unwarned-reclaim-cycles": 10,
> > "warned-reclaim-cycles": 20
> > },
> > "subnet4": [
> > {
> > "id": 1,
> > "subnet": "192.0.2.0/24",
> > "pools": [
> > {
> > "pool": "192.0.2.100 - 192.0.2.200"
> > }
> > ],
> > "option-data": [
> > {
> > "name": "routers",
> > "data": "192.0.2.1"
> > }
> > ]
> > }
> > ],
> > "hosts-database": {
> > "type": "memfile",
> > "persist": true,
> > "name": "hosts.json"
> > },
> > "dhcp-ddns": {
> > "enable-updates": true,
> > "qualifying-suffix": "example.com",
> > "reverse-ddns": true,
> > "hostname-char-set": "[a-zA-Z0-9.-]"
> > },
> > "valid-lifetime": 300,
> > "renew-timer": 150,
> > "rebind-timer": 225,
> > "interfaces-config": {
> > "interfaces": ["eth0"]
> > },
> > "dhcp-disable": false,
> > "option-def": [
> > {
> > "name": "domain-name-servers",
> > "code": 6,
> > "type": "ipv4-address",
> > "array": true
> > }
> > ],
> > "option-data": [
> > {
> > "name": "domain-name-servers",
> > "data": "192.0.2.2, 192.0.2.3"
> > }
> > ],
> > "failover": {
> > "name": "dhcp-failover",
> > "mode": "hot-standby",
> > "peer-address": "192.0.2.101",
> > "peer-port": 519,
> > "max-response-delay": 60,
> > "max-unacked-clients": 10000,
> > "load-balance-max-percent": 50,
> > "load-balance-max-secs": 3600,
> > "auto-partner-down": true,
> > "decline-time": 60,
> > "down-time": 300,
> > "startup-delay": 10,
> > "trust-local-time": true,
> > "heartbeat-interval": 10,
> > "connect-timeout": 2
> > }
> > }
> > }
> > #sample example of HA
> > ===================
> > {
> > "Dhcp4": {
> > "valid-lifetime": 3600,
> > "renew-timer": 600,
> > "rebind-timer": 1200,
> > "subnet4": [
> > {
> > "subnet": "192.168.0.0/24",
> > "pools": [
> > {
> > "pool": "192.168.0.100 - 192.168.0.200"
> > }
> > ],
> > "option-data": [
> > {
> > "name": "domain-name-servers",
> > "data": "8.8.8.8, 8.8.4.4"
> > },
> > {
> > "name": "domain-name",
> > "data": "example.com"
> > }
> > ],
> > "reservations": [
> > {
> > "hw-address": "00:11:22:33:44:55",
> > "ip-address": "192.168.0.10",
> > "hostname": "host1.example.com"
> > }
> > ]
> > }
> > ],
> > "interfaces-config": {
> > "interfaces": ["eth0", "eth1"]
> > },
> > "ha": {
> > "mode": "hot-standby",
> > "ip-address": "192.168.0.2",
> > "shared-secret": "my-secret",
> > "peer-address": "192.168.0.3"
> > }
> > }
> > }
> >
> > But when I search for the same in the official kea-doc. I don't see any
> such reference to failover directive or a key-word. Not sure if it is not
> supported from 2.2.0 version and later or I missed any other docs. Just
> curious to know if we really have such a difference, and if any one is
> familiar with this can you please share the reference for it.
> >
> > Thanks in Advance
> > Kraishak
> >
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