Hi,
Kea could have a solution in 2.6.1, but I'm not sure it would work
because you are using a name rather than an IP for the database. So
the name resolution is failing. But there is a retry-on-startup
parameter:
https://kea.readthedocs.io/en/kea-2.6.1/arm/database-connectivity.html
Since Kea was never able to actually try to connect, it may not retry.
This would have to be tested.
Thank you,
Darren Ankney
On Wed, Oct 30, 2024 at 2:50 AM Wagner Vlastimil - HZS Ústeckého kraje
<vlastimil.wag...@hzscr.cz> wrote:
>
> I made in systemd service:
>
> ExecStartPre=/bin/bash -c "until host db.example.com; do sleep 1; done"
>
> but i thought that Kea have solution
>
> VW
>
> On Út, 2024-10-29 at 12:23 +0000, Geist, Dan (CCI-Atlanta) via Kea-users
> wrote:
> >
> >
> >
> > Have you considered putting in a “watchdog” timer at the operating system
> > level to restart the OS after a number of minutes (if network link is down)
> > to allow your network gear more time to recover?
> >
> >
> >
> >
> >
> >
> >
> >
> >
> > From:Kea-users <kea-users-boun...@lists.isc.org> on behalf of Wagner
> > Vlastimil - HZS Ústeckého kraje <vlastimil.wag...@hzscr.cz>
> > Date: Tuesday, October 29, 2024 at 8:00 AM
> > To: kea-users@lists.isc.org <kea-users@lists.isc.org>
> > Subject: [EXTERNAL] [Kea-users] Kea fail start after power outage, mysql
> > connect problem
> >
> >
> > Hi
> >
> > I have Kea servers on places where sometimes doesnt work power (longer than
> > UPS)
> > I have config, leases and hosts in database MySQL
> > When power is back server get up faster than switches and routers so
> > interface is down and Kea doesnt start
> >
> > říj 29 12:42:15 dhcp-01.hzsulk.cz kea-dhcp4[8647]: ERROR
> > [kea-dhcp4.dhcp4.140105088432256] DHCP4_CONFIG_LOAD_FAIL configuration
> > error using file: /etc/kea/kea-dhcp4.conf, reason: during update from
> > config backend database: Unknown server host 'db.example.com' (-2)
> > říj 29 12:42:15 dhcp-01.hzsulk.cz kea-dhcp4[8647]: ERROR
> > [kea-dhcp4.dhcp4.140105088432256] DHCP4_INIT_FAIL failed to initialize Kea
> > server: configuration error using file '/etc/kea/kea-dhcp4.conf':
> > during update from config backend database: Unknown server host
> > 'db.example.com' >
> > říj 29 12:42:15 dhcp-01.hzsulk.cz kea-dhcp4[8647]: ERROR
> > [kea-dhcp4.dhcp4.140105088432256] DHCP4_PARSER_COMMIT_FAIL parser failed to
> > commit changes: during update from config backend database:
> > Unknown server host 'db.example.com' (-2)
> >
> >
> > Config is:
> >
> >
> > "Dhcp4": {
> > "server-tag": "DHCP-01",
> > "interfaces-config": {
> > "interfaces": ["ens33"],
> > "service-sockets-max-retries": 100,
> > "service-sockets-retry-wait-time": 5000
> > },
> > "config-control": {
> > "config-databases": [{
> > "type": "mysql",
> > "name": "kea",
> > "user": "kea",
> > "password": "fhgfethfgthtfeg",
> > "host": "db.example.com",
> > "port": 3306,
> > # "retry-on-startup": "true",
> > "max-reconnect-tries" : 30000,
> > "reconnect-wait-time": 3000
> > }],
> > "config-fetch-wait-time": 20
> > },
> >
> > No setting work to try connect again
> >
> >
> > VW
>
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