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derp: increase update frequency and harden on failures (#2741)

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This commit is contained in:
Kristoffer Dalby
2025-08-22 10:40:38 +02:00
committed by GitHub
parent 51c6367bb1
commit b87567628a
10 changed files with 417 additions and 67 deletions
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12
hscontrol/derp/server/derp_server.go
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@@ -276,7 +276,7 @@ func DERPProbeHandler(
// An example implementation is found here https://derp.tailscale.com/bootstrap-dns
// Coordination server is included automatically, since local DERP is using the same DNS Name in d.serverURL.
func DERPBootstrapDNSHandler(
derpMap *tailcfg.DERPMap,
derpMap tailcfg.DERPMapView,
) func(http.ResponseWriter, *http.Request) {
return func(
writer http.ResponseWriter,
@@ -287,18 +287,18 @@ func DERPBootstrapDNSHandler(
resolvCtx, cancel := context.WithTimeout(req.Context(), time.Minute)
defer cancel()
var resolver net.Resolver
for _, region := range derpMap.Regions {
for _, node := range region.Nodes { // we don't care if we override some nodes
addrs, err := resolver.LookupIP(resolvCtx, "ip", node.HostName)
for _, region := range derpMap.Regions().All() {
for _, node := range region.Nodes().All() { // we don't care if we override some nodes
addrs, err := resolver.LookupIP(resolvCtx, "ip", node.HostName())
if err != nil {
log.Trace().
Caller().
Err(err).
Msgf("bootstrap DNS lookup failed %q", node.HostName)
Msgf("bootstrap DNS lookup failed %q", node.HostName())
continue
}
dnsEntries[node.HostName] = addrs
dnsEntries[node.HostName()] = addrs
}
}
writer.Header().Set("Content-Type", "application/json")