Name fix

- update readme

README.md

@@ -1 +1,34 @@
 # DynDNSv2
+
+This is a docker wrapper arround the DynDNS v2 API that automatically updates the DNS server whenever the public IP of the system changes.
+
+# Usage
+
+## Docker Compose
+
+This is an example using the strato.de DynDNS api
+
+```yaml
+version: "3"
+services:
+    dyndnsv2:
+        image: ghcr.io/sandoun/dyndnsv2:latest
+        container_name: dyndnsv2
+        environment:
+        - UPDATE_URL=https://dyndns.strato.com/nic/update
+        - USERNAME=*YOUR USERNAME*
+        - PASSWORD=*YOUR PASSWORD*
+        - UPDATE_DOMAIN_1=domain.com
+        - UPDATE_DOMAIN_2=subdomain1.domain.com
+        - UPDATE_DOMAIN_3=subdomain2.domain.com
+        #add more by incrementing by 1
+```
+
+## Environment Variables
+
+|Name|Description|Example|
+|----|-----|-------|
+|UPDATE_URL|The update URL of your provider|https://dyndns.strato.com/nic/update|
+|USERNAME|Your login username|Username|
+|PASSWORD|Your login password|Password123|
+|UPDATE_DOMAIN_[N]|A domain to update, it starts with N=1 and increments by 1 for each additional one|domain.com

src/DynDNSv2/Updater.cs

@@ -63,7 +63,7 @@ internal class Updater : BackgroundService
         int i = 1;
         while(true)
         {
-            var found = Environment.GetEnvironmentVariable($"UPDATE_URL_{i}");
+            var found = Environment.GetEnvironmentVariable($"UPDATE_DOMAIN_{i}");
 
             if(!string.IsNullOrEmpty(found))
             {
@@ -78,7 +78,7 @@ internal class Updater : BackgroundService
         }
 
         if(updateLst.Count <= 0)
-            throw new Exception("No UPDATE_URL_[N] env variable found, pleace specify one with UPDATE_URL_1, UPDATE_URL_2 ...");
+            throw new Exception("No UPDATE_DOMAIN_[N] env variable found, pleace specify one with UPDATE_DOMAIN_1, UPDATE_DOMAIN_2 ...");
 
         updateDomains = updateLst.ToArray();