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# Architecture DNS
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```mermaid
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flowchart LR
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subgraph External
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externalRecursor[recursor]
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GandiDns[ hetzner ducamps.win]
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end
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subgraph Internal
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pihole[pihole]--ducamps.win-->NAS
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pihole--service.consul-->consul[consul cluster]
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pihole--->recursor
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recursor--service.consul-->consul
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DHCP --dynamic update--> NAS
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NAS
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recursor--ducamps.win-->NAS
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consul--service.consul--->consul
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clients--->pihole
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clients--->recursor
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end
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pihole --> externalRecursor
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recursor-->External
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```
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## Detail
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Pihole container in nomad cluster is set as primary DNS as add blocker secondary DNS recursore is locate on gerard
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DNS locate on NAS manage domain *ducamps.win* on local network each recursor forward each request on *ducamps.win* to this DNS.
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2023-11-01 18:53:42 +00:00
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Each DNS forward *service.consul* request to the consul cluster.
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Each consul node have a consul redirection in systemd-resolved to theire own consul client
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a DHCP service is set to do dynamic update on NAS DNS on lease delivery
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external recursor are set on pihole on cloudflare and FDN in case of recursors faillure
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