Hi,
Isn't it the purpose of the "Unit" section in the service file ?
cat /usr/lib/systemd/system/kea-dhcp4.service
[Unit]
Description=Kea DHCPv4 Service
Documentation=man:kea-dhcp4(8)
Wants=network-online.target
After=network-online.target
After=time-sync.target
[Service]
User=kea
AmbientCapabilities=CAP_NET_BIND_SERVICE CAP_NET_RAW
Environment="KEA_PIDFILE_DIR=/run/kea"
Environment="KEA_LOCKFILE_DIR=/run/kea"
Environment="KEA_LOGGER_DESTINATION=/var/log/kea"
ConfigurationDirectory=kea
RuntimeDirectory=kea
RuntimeDirectoryPreserve=yes
LogsDirectory=kea
LogsDirectoryMode=0750
StateDirectory=kea
ExecStart=/usr/sbin/kea-dhcp4 -c /etc/kea/kea-dhcp4.conf
ExecReload=/bin/kill -HUP $MAINPID
[Install]
WantedBy=multi-user.target
________________________________
From: Kea-users <kea-users-boun...@lists.isc.org> on behalf of Wagner Vlastimil
- HZS Ústeckého kraje <vlastimil.wag...@hzscr.cz>
Sent: Wednesday, October 30, 2024 7:50 AM
To: kea-users@lists.isc.org <kea-users@lists.isc.org>
Subject: Re: [Kea-users] [EXTERNAL] Kea fail start after power outage, mysql
connect problem
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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