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Hi,</div>
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Isn't it the purpose of the "Unit" section in the service file ?</div>
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cat /usr/lib/systemd/system/kea-dhcp4.service</div>
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[Unit]</div>
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Description=Kea DHCPv4 Service</div>
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Documentation=man:kea-dhcp4(8)</div>
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Wants=network-online.target</div>
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After=network-online.target</div>
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After=time-sync.target</div>
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[Service]</div>
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User=kea</div>
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AmbientCapabilities=CAP_NET_BIND_SERVICE CAP_NET_RAW</div>
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Environment="KEA_PIDFILE_DIR=/run/kea"</div>
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Environment="KEA_LOCKFILE_DIR=/run/kea"</div>
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Environment="KEA_LOGGER_DESTINATION=/var/log/kea"</div>
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ConfigurationDirectory=kea</div>
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RuntimeDirectory=kea</div>
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RuntimeDirectoryPreserve=yes</div>
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LogsDirectory=kea</div>
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LogsDirectoryMode=0750</div>
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StateDirectory=kea</div>
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ExecStart=/usr/sbin/kea-dhcp4 -c /etc/kea/kea-dhcp4.conf</div>
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ExecReload=/bin/kill -HUP $MAINPID</div>
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[Install]</div>
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WantedBy=multi-user.target</div>
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<div id="divRplyFwdMsg" dir="ltr"><font face="Calibri, sans-serif" style="font-size:11pt" color="#000000"><b>From:</b> Kea-users <kea-users-bounces@lists.isc.org> on behalf of Wagner Vlastimil - HZS Ústeckého kraje <Vlastimil.Wagner@hzscr.cz><br>
<b>Sent:</b> Wednesday, October 30, 2024 7:50 AM<br>
<b>To:</b> kea-users@lists.isc.org <kea-users@lists.isc.org><br>
<b>Subject:</b> Re: [Kea-users] [EXTERNAL] Kea fail start after power outage, mysql connect problem</font>
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<div class="PlainText">I made in systemd service:<br>
<br>
ExecStartPre=/bin/bash -c "until host db.example.com; do sleep 1; done"<br>
<br>
but i thought that Kea have solution<br>
<br>
VW<br>
<br>
On Út, 2024-10-29 at 12:23 +0000, Geist, Dan (CCI-Atlanta) via Kea-users wrote:<br>
> <br>
> <br>
> <br>
> 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?<br>
> <br>
> <br>
> <br>
> <br>
> <br>
> <br>
> <br>
> <br>
> <br>
> From:Kea-users <kea-users-bounces@lists.isc.org> on behalf of Wagner Vlastimil - HZS Ústeckého kraje <Vlastimil.Wagner@hzscr.cz><br>
> Date: Tuesday, October 29, 2024 at 8:00 AM<br>
> To: kea-users@lists.isc.org <kea-users@lists.isc.org><br>
> Subject: [EXTERNAL] [Kea-users] Kea fail start after power outage, mysql connect problem<br>
> <br>
> <br>
> Hi<br>
> <br>
> I have Kea servers on places where sometimes doesnt work power (longer than UPS) <br>
> I have config, leases and hosts in database MySQL<br>
> When power is back server get up faster than switches and routers so interface is down and Kea doesnt start<br>
> <br>
> 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<br>
> config backend database: Unknown server host 'db.example.com' (-2) <br>
> 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':<br>
> during update from config backend database: Unknown server host 'db.example.com' >
<br>
> 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:<br>
> Unknown server host 'db.example.com' (-2) <br>
> <br>
> <br>
> Config is:<br>
> <br>
> <br>
> "Dhcp4": {<br>
> "server-tag": "DHCP-01",<br>
> "interfaces-config": {<br>
> "interfaces": ["ens33"],<br>
> "service-sockets-max-retries": 100,<br>
> "service-sockets-retry-wait-time": 5000<br>
> },<br>
> "config-control": {<br>
> "config-databases": [{<br>
> "type": "mysql",<br>
> "name": "kea",<br>
> "user": "kea",<br>
> "password": "fhgfethfgthtfeg",<br>
> "host": "db.example.com",<br>
> "port": 3306,<br>
> # "retry-on-startup": "true",<br>
> "max-reconnect-tries" : 30000,<br>
> "reconnect-wait-time": 3000<br>
> }],<br>
> "config-fetch-wait-time": 20<br>
> },<br>
> <br>
> No setting work to try connect again<br>
> <br>
> <br>
> VW<br>
<br>
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