If I’m not completely wrong, this diagram shows the communication paths between
the two servers running in HA mode. Slightly different from what I initially
thought. May be something like this could have been an idea to have as part of
the docs?
server1 server2
+-----------------------+ +-----------------------+
| | | |
| | | |
| +---------------+ | | +---------------+ |
| | | 8000 8000 | | |
| | kea-ctrl-agent|<--+----\ /---+-->| kea-ctrl-agent| |
| | | | \ / | | | |
| +---------------+ | \ / | +---------------+ |
| | \ / | |
| | \ | |
| | / \ | |
| +---------------+ | / \ | +---------------+ |
| | | | / \ | | | |
| | kea-dhcp4 +---+----/ \---+---+ kea-dhcp4 | |
| | | | | | | |
| +---------------+ | | +---------------+ |
| | | |
| | | |
+-----------------------+ +-----------------------+
./PerW
From: Kea-users <[email protected]> On Behalf Of Weisteen Per
Sent: torsdag 24. mars 2022 13:28
To: Bohnenberger, Mark <[email protected]>; Victoria Risk
<[email protected]>
Cc: [email protected]
Subject: Re: [Kea-users] problems enabling HA Hot-Standby setup (OPEN)
Thanks Mark, that did the trick! ☺
So I’m not supposed to use loopback address in kea-ctrl-agent.conf but the
servers real address.
And I’m supposed to use same port both for kea-ctrl-agent as well as
kea-dhcp4/6.
Thanks for all help ☺
./PerW
From: Bohnenberger, Mark
<[email protected]<mailto:[email protected]>>
Sent: torsdag 24. mars 2022 11:36
To: Victoria Risk <[email protected]<mailto:[email protected]>>; Weisteen Per
<[email protected]<mailto:[email protected]>>
Cc: [email protected]<mailto:[email protected]>
Subject: AW: [Kea-users] problems enabling HA Hot-Standby setup (OPEN)
The HA Service doesn’t need SQL backend. Here are some config snippets how it
is working in my environment. Just replace the code between <> with your system
data.
########## Kea-ctrl-agent.conf
{
// RESTful interface to be available at http://127.0.0.1:8000/
"Control-agent": {
"http-host": "<LOCAL IP>",
"http-port": 8000,
"control-sockets": {
….
########### Kea-dhcp4.conf
"hooks-libraries": [
{
"library": "/opt/kea/lib/kea/hooks/libdhcp_stat_cmds.so",
"parameters": { }
},
{
"library": "/opt/kea/lib/kea/hooks/libdhcp_lease_cmds.so",
"parameters": { }
},
{
"library": "/opt/kea/lib/kea/hooks/libdhcp_ha.so",
"parameters": {
"high-availability": [ {
"this-server-name": "<NAME SERVER SAME AS PEER
CONFIGURATION>",
"mode": "hot-standby",
"heartbeat-delay": 10000,
"max-response-delay": 10000,
"max-ack-delay": 5000,
"max-unacked-clients": 5,
"peers": [
{
"name": "<NAME PRIMARY>",
"url": http://<IP
PRIMARY>5:8000/<http://%3cIP%20PRIMARY%3e5:8000/>,
"role": "primary",
"auto-failover": true
},
{
"name": "<NAME SECONDARY>",
"url": http://<IP
SECONDARY>:8000/<http://%3cIP%20SECONDARY%3e:8000/>,
"role": "secondary",
"auto-failover": true
}
]
} ]
}
}
],
- Mark
Von: Kea-users
<[email protected]<mailto:[email protected]>> Im
Auftrag von Victoria Risk
Gesendet: Donnerstag, 24. März 2022 10:41
An: Weisteen Per <[email protected]<mailto:[email protected]>>
Cc: [email protected]<mailto:[email protected]>
Betreff: Re: [Kea-users] problems enabling HA Hot-Standby setup (OPEN)
On Mar 24, 2022, at 10:13 AM, Weisteen Per
<[email protected]<mailto:[email protected]>> wrote:
I believe I’ve discovered why my setup doesn’t play. Seems HA feature depends
on using configuration backend (CB) which again requires use of MySQL.
I was hoping HA could have worked using memfile but I guess not.
I am sorry I can’t tell you how to fix your configuration, but I am positive
the HA feature does NOT depend on the configuration backend. HA definitely
works with memfile. This is not the problem.
Vicky
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