JVM and OS DNS Caching

Question

I am facing a problem with JVM and DNS.

Everything I\'m reading (including the docs and this) says that I can disable JVM DNS caching using networkaddress.cache.tt

Answer 1

You can either edit your $JAVA_HOME/jre/lib/security/java.security for Java 6-8 and $JAVA_HOME/conf/security/java.security property file to add the following property .

networkaddress.cache.ttl=1

It is not available to set it in command line.

Since these 2 properties are part of the security policy, they are not set by either the -D option or the System.setProperty() API, instead they are set as security properties.

To set this property inside the code, you can use the following method.

java.security.Security.setProperty("networkaddress.cache.ttl", "1")

Or add the following property in the java command line.

-Dnetworkaddress.cache.ttl=1

It is also important to note that values are effective only if the corresponding networkaddress.cache.* properties are not set.

See Java 8 Networking Properties, Java 9 Networking Properties and VeriSign DNS Caching in Java Virtual Machines for more details.

This answer also adds some details.