Merge pull request #288713 from pauljewellmsft/java-dns-ttl

Add section for JVM TTL

Author: prmerger-automator[bot]

articles/storage/blobs/storage-blob-java-get-started.md

@@ -8,7 +8,7 @@ author: pauljewellmsft
 ms.author: pauljewell
 ms.service: azure-blob-storage
 ms.topic: how-to
-ms.date: 10/02/2024
+ms.date: 10/18/2024
 ms.custom: devx-track-java, devguide-java, devx-track-extended-java
 ---
 
@@ -178,6 +178,20 @@ For information about how to obtain account keys and best practice guidelines fo
 
 ---
 
+## Configure the JVM TTL for DNS name lookups
+
+The Java Virtual Machine (JVM) caches responses from successful DNS name lookups for a specified period of time, known as time-to-live (TTL). The default TTL value for many JVMs is `-1`, which means that the JVM caches the response indefinitely, or until the JVM is restarted.
+
+Because Azure resources use DNS name entries that can change, we recommend that you set the JVM TTL value to 10 seconds. This configuration ensures that an updated IP address for a resource is returned with the next DNS query.
+
+To change the TTL value globally for all applications using the JVM, set the `networkaddress.cache.ttl` property in the `java.security` file.
+
+```plaintext
+networkaddress.cache.ttl=10
+```
+
+For Java 8, the `java.security` file is located in the `$JAVA_HOME/jre/lib/security` directory. For Java 11 and higher, the file is located in the `$JAVA_HOME/conf/security` directory.
+
 ## Build your app
 
 As you build apps to work with data resources in Azure Blob Storage, your code primarily interacts with three resource types: storage accounts, containers, and blobs. To learn more about these resource types, how they relate to one another, and how apps interact with resources, see [Understand how apps interact with Blob Storage data resources](storage-blob-object-model.md).