fix: use sequential approach

providers/dns/corenetworks/corenetworks.go

@@ -22,6 +22,7 @@ const (
 	EnvTTL                = envNamespace + "TTL"
 	EnvPropagationTimeout = envNamespace + "PROPAGATION_TIMEOUT"
 	EnvPollingInterval    = envNamespace + "POLLING_INTERVAL"
+	EnvSequenceInterval   = envNamespace + "SEQUENCE_INTERVAL"
 	EnvHTTPTimeout        = envNamespace + "HTTP_TIMEOUT"
 )
 
@@ -31,6 +32,7 @@ type Config struct {
 	Password           string
 	PropagationTimeout time.Duration
 	PollingInterval    time.Duration
+	SequenceInterval   time.Duration
 	TTL                int
 	HTTPClient         *http.Client
 }
@@ -41,6 +43,7 @@ func NewDefaultConfig() *Config {
 		TTL:                env.GetOrDefaultInt(EnvTTL, 3600),
 		PropagationTimeout: env.GetOrDefaultSecond(EnvPropagationTimeout, dns01.DefaultPropagationTimeout),
 		PollingInterval:    env.GetOrDefaultSecond(EnvPollingInterval, dns01.DefaultPollingInterval),
+		SequenceInterval:   env.GetOrDefaultSecond(EnvSequenceInterval, dns01.DefaultPropagationTimeout),
 		HTTPClient: &http.Client{
 			Timeout: env.GetOrDefaultSecond(EnvHTTPTimeout, 30*time.Second),
 		},
@@ -93,6 +96,12 @@ func (d *DNSProvider) Timeout() (timeout, interval time.Duration) {
 	return d.config.PropagationTimeout, d.config.PollingInterval
 }
 
+// Sequential All DNS challenges for this provider will be resolved sequentially.
+// Returns the interval between each iteration.
+func (d *DNSProvider) Sequential() time.Duration {
+	return d.config.SequenceInterval
+}
+
 // Present creates a TXT record using the specified parameters.
 func (d *DNSProvider) Present(domain, token, keyAuth string) error {
 	info := dns01.GetChallengeInfo(domain, keyAuth)

providers/dns/corenetworks/corenetworks.toml

@@ -19,6 +19,7 @@ lego --email [email protected] --dns corenetworks --domains my.example.org run
     CORENETWORKS_PROPAGATION_TIMEOUT = "Maximum waiting time for DNS propagation"
     CORENETWORKS_TTL = "The TTL of the TXT record used for the DNS challenge"
     CORENETWORKS_HTTP_TIMEOUT = "API request timeout"
+    CORENETWORKS_SEQUENCE_INTERVAL = "Time between sequential requests"
 
 [Links]
   API = "https://beta.api.core-networks.de/doc/"