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Improve handling of failing dns resolvers

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Daniel 2020-07-20 16:42:21 +02:00
parent 8dea8e6c46
commit 25a3f6053d
2 changed files with 6 additions and 8 deletions
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8
resolver/resolve.go
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@ -302,18 +302,16 @@ resolveLoop:
// we are offline and this is not an online check query // we are offline and this is not an online check query
return nil, ErrOffline return nil, ErrOffline
default: default:
// includes ErrTimeout
log.Tracer(ctx).Debugf("resolver: failed to resolve %s: %s", q.FQDN, err) log.Tracer(ctx).Debugf("resolver: failed to resolve %s: %s", q.FQDN, err)
} }
} else { }
// no error
if rrCache == nil { if rrCache == nil {
// defensive: assume NXDomain continue
return nil, ErrNotFound
} }
break resolveLoop break resolveLoop
} }
} }
}
// check for error // check for error
if err != nil { if err != nil {

2
resolver/resolver.go
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@ -28,7 +28,7 @@ const (
var ( var (
// FailThreshold is amount of errors a resolvers must experience in order to be regarded as failed. // FailThreshold is amount of errors a resolvers must experience in order to be regarded as failed.
FailThreshold = 5 FailThreshold = 20
) )
// Resolver holds information about an active resolver. // Resolver holds information about an active resolver.