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Forward DNS queries to DNS-servers. Sometimes I need to access a kubernetes-cluster using a wireguard vpn-tunnel and access some services. So I usually let wireguard define the DNS-server I am using since it also resolve to public DNS besides the internal kubernetes-services.

Sometimes the vpn-tunnel becomes stale and I need to disconnect and reconnect. So I wanted a DNS-forwarder that could talk to one or more public DNS-servers besides the kubernetes DNS-server. I started out having Claude make a simpel DNS-forwarder.

This DNS-forwarder will send out a request to each DNS-server defined in config.rs and stop when it receives an answer or None if name resolution was not successful.

I noticed a delay when connecting to a kubernetes-service and it turned out the client was issuing a DNS-request for type A (IPv4), AAAA (IPv6) and that introduced this delay. The client in this case is psql to access a PostgreSQL database.

An example of a configuration is printed to the console with ./target/release/dns_load_balancer example. Save end edit the file config.toml to use your preferred DNS-servers.

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