Merge pull request #5325 from BasJ93/docs-update-rfc2136

docs: update rfc2136

Author: k8s-ci-robot

docs/flags.md

@@ -133,7 +133,7 @@
 | `--exoscale-apisecret=""` | Provide your API Secret for the Exoscale provider |
 | `--rfc2136-host=` | When using the RFC2136 provider, specify the host of the DNS server (optionally specify multiple times when when using --rfc2136-load-balancing-strategy) |
 | `--rfc2136-port=0` | When using the RFC2136 provider, specify the port of the DNS server |
-| `--rfc2136-zone=RFC2136-ZONE` | When using the RFC2136 provider, specify zone entries of the DNS server to use |
+| `--rfc2136-zone=RFC2136-ZONE` | When using the RFC2136 provider, specify zone entry of the DNS server to use (can be specified multiple times) |
 | `--[no-]rfc2136-create-ptr` | When using the RFC2136 provider, enable PTR management |
 | `--[no-]rfc2136-insecure` | When using the RFC2136 provider, specify whether to attach TSIG or not (default: false, requires --rfc2136-tsig-keyname and rfc2136-tsig-secret) |
 | `--rfc2136-tsig-keyname=""` | When using the RFC2136 provider, specify the TSIG key to attached to DNS messages (required when --rfc2136-insecure=false) |

docs/tutorials/rfc2136.md

@@ -497,6 +497,35 @@ external-dns \
   --rfc2136-insecure
 ```
 
+### Helm
+
+```yaml
+extraArgs:
+  - --rfc2136-host="dns-host-1.yourdomain.com"
+  - --rfc2136-port=53
+  - --rfc2136-zone=example.com
+  - --rfc2136-tsig-secret-alg=hmac-sha256
+  - --rfc2136-tsig-axfr
+
+env:
+  - name: "EXTERNAL_DNS_RDC2136_TSIG_SECRET"
+    valueFrom:
+      secretKeyRef:
+        name: rfc2136-keys
+        key: rfc2136-tsig-secret
+  - name: "EXTERNAL_DNS_RDC2136_TSIG_KEYNAME"
+    valueFrom:
+      secretKeyRef:
+        name: rfc2136-keys
+        key: rfc2136-tsig-keyname
+```
+
+#### Secret creation
+
+```shell
+kubectl create secret generic rfc2136-keys --from-literal=rfc2136-tsig-secret='xxx' --from-literal=rfc2136-tsig-keyname='k8s-external-dns-key' -n external-dns
+```
+
 ### Benefits
 
 - Distributes the load of DNS updates across multiple data centers, preventing any single DC from becoming a bottleneck.

pkg/apis/externaldns/types.go

@@ -580,7 +580,7 @@ func App(cfg *Config) *kingpin.Application {
 	// Flags related to RFC2136 provider
 	app.Flag("rfc2136-host", "When using the RFC2136 provider, specify the host of the DNS server (optionally specify multiple times when when using --rfc2136-load-balancing-strategy)").Default(defaultConfig.RFC2136Host[0]).StringsVar(&cfg.RFC2136Host)
 	app.Flag("rfc2136-port", "When using the RFC2136 provider, specify the port of the DNS server").Default(strconv.Itoa(defaultConfig.RFC2136Port)).IntVar(&cfg.RFC2136Port)
-	app.Flag("rfc2136-zone", "When using the RFC2136 provider, specify zone entries of the DNS server to use").StringsVar(&cfg.RFC2136Zone)
+	app.Flag("rfc2136-zone", "When using the RFC2136 provider, specify zone entry of the DNS server to use (can be specified multiple times)").StringsVar(&cfg.RFC2136Zone)
 	app.Flag("rfc2136-create-ptr", "When using the RFC2136 provider, enable PTR management").Default(strconv.FormatBool(defaultConfig.RFC2136CreatePTR)).BoolVar(&cfg.RFC2136CreatePTR)
 	app.Flag("rfc2136-insecure", "When using the RFC2136 provider, specify whether to attach TSIG or not (default: false, requires --rfc2136-tsig-keyname and rfc2136-tsig-secret)").Default(strconv.FormatBool(defaultConfig.RFC2136Insecure)).BoolVar(&cfg.RFC2136Insecure)
 	app.Flag("rfc2136-tsig-keyname", "When using the RFC2136 provider, specify the TSIG key to attached to DNS messages (required when --rfc2136-insecure=false)").Default(defaultConfig.RFC2136TSIGKeyName).StringVar(&cfg.RFC2136TSIGKeyName)