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Thomas Bouron resolved BROOKLYN-579. ------------------------------------ Resolution: Fixed Assignee: Thomas Bouron Fixed by https://github.com/apache/brooklyn-dist/pull/121 > DNS lookups cached for too long > ------------------------------- > > Key: BROOKLYN-579 > URL: https://issues.apache.org/jira/browse/BROOKLYN-579 > Project: Brooklyn > Issue Type: Bug > Reporter: Alex Heneveld > Assignee: Thomas Bouron > Priority: Major > > I've had issues where DNS values are changed but Brooklyn doesn't see those. > I think Java caches hostnames forever by default, ignoring DNS TTL. > (Controlling Route 53 from Brooklyn is one obvious such example!) > We should consider overriding this. > Oracle Cloud describe how > (https://docs.us-phoenix-1.oraclecloud.com/Content/API/SDKDocs/javasdk.htm): > > {quote}The JVM uses the > [networkaddress.cache.ttl|http://docs.oracle.com/javase/8/docs/technotes/guides/net/properties.html] > property to specify the caching policy for DNS name lookups. The value is an > integer that represents the number of seconds to cache the successful lookup. > The default value for many JVMs, {{-1}}, indicates that the lookup should be > cached forever. > Because resources in Oracle Cloud Infrastructure use DNS names that can > change, we recommend that you change the the TTL value to 60 seconds. This > ensures that the new IP address for the resource is returned on next DNS > query. You can change this value globally or specifically for your > application: > {quote} * > {quote}To set TTL globally for all applications using the JVM, add the > following in the {{$JAVA_HOME/jre/lib/security/java.security}} file: > {{networkaddress.cache.ttl=60}}{quote} > * > {quote}To set TTL only for your application, set the following in your > application's initialization code: > {{java.security.Security.setProperty("networkaddress.cache.ttl" , > "60");}}{quote} -- This message was sent by Atlassian JIRA (v7.6.3#76005)