Hi, I’m trying to run NiFi in a clustered configuration within docker containers on kubernetes. While I have NiFi starting in standalone mode, I get exceptions when launching it in clustered mode. I’m having a lot of trouble figuring out what the host names really should be.
I looked through the system properties<http://nifi.apache.org/docs/nifi-docs/html/administration-guide.html#system_properties> (web and cluster properties) and also the Admin Guide (Cluster setup section). The description of these host properties is quite vague: nifi.cluster.node.address – The fully qualified address of the node. It is blank by default. Nifi.web.http.host – The HTTP host. It is blank by default. Nifi.web.https.host – The HTTPS host. It is blank by default. The descriptions above are quite vague and don’t explain to me how NiFi will behave based on these values. In fact, I keep needing to go through a lot of trial and error to make this work. What happens if they are blank? What happens if I insert the IP address? Just asking for the host name is ambiguous, I have a docker internal host name, an EC2 host name, a kubernetes service name, load balancer host names, and a route53 host name. The correct value really depends on how these are used in the code. I could easily see these needing to be the kubernetes service name or the internal host name, or the route53 host name. What should I be using here? Should all nodes in the cluster have the same value for this? Here is the stack trace I am seeing at runtime: 2017-08-08 14:23:51,534 ERROR [NiFi logging handler] org.apache.nifi.StdErr Failed to start web server: Unresolved address 2017-08-08 14:23:51,535 ERROR [NiFi logging handler] org.apache.nifi.StdErr Shutting down... 2017-08-08 14:23:51,536 INFO [NiFi logging handler] org.apache.nifi.StdOut 2017-08-08 14:23:51,536 WARN [main] org.apache.nifi.web.server.JettyServer Failed to start web server... shutting down. 2017-08-08 14:23:51,536 INFO [NiFi logging handler] org.apache.nifi.StdOut java.net.SocketException: Unresolved address 2017-08-08 14:23:51,536 INFO [NiFi logging handler] org.apache.nifi.StdOut at sun.nio.ch.Net.translateToSocketException(Net.java:131) 2017-08-08 14:23:51,536 INFO [NiFi logging handler] org.apache.nifi.StdOut at sun.nio.ch.Net.translateException(Net.java:157) 2017-08-08 14:23:51,536 INFO [NiFi logging handler] org.apache.nifi.StdOut at sun.nio.ch.Net.translateException(Net.java:163) 2017-08-08 14:23:51,536 INFO [NiFi logging handler] org.apache.nifi.StdOut at sun.nio.ch.ServerSocketAdaptor.bind(ServerSocketAdaptor.java:76) 2017-08-08 14:23:51,536 INFO [NiFi logging handler] org.apache.nifi.StdOut at org.eclipse.jetty.server.ServerConnector.open(ServerConnector.java:298) 2017-08-08 14:23:51,536 INFO [NiFi logging handler] org.apache.nifi.StdOut at org.eclipse.jetty.server.AbstractNetworkConnector.doStart(AbstractNetworkConnector.java:80) 2017-08-08 14:23:51,536 INFO [NiFi logging handler] org.apache.nifi.StdOut at org.eclipse.jetty.server.ServerConnector.doStart(ServerConnector.java:236) 2017-08-08 14:23:51,536 INFO [NiFi logging handler] org.apache.nifi.StdOut at org.eclipse.jetty.util.component.AbstractLifeCycle.start(AbstractLifeCycle.java:68) 2017-08-08 14:23:51,536 INFO [NiFi logging handler] org.apache.nifi.StdOut at org.eclipse.jetty.server.Server.doStart(Server.java:431) 2017-08-08 14:23:51,536 INFO [NiFi logging handler] org.apache.nifi.StdOut at org.eclipse.jetty.util.component.AbstractLifeCycle.start(AbstractLifeCycle.java:68) 2017-08-08 14:23:51,536 INFO [NiFi logging handler] org.apache.nifi.StdOut at org.apache.nifi.web.server.JettyServer.start(JettyServer.java:705) 2017-08-08 14:23:51,536 INFO [NiFi logging handler] org.apache.nifi.StdOut at org.apache.nifi.NiFi.<init>(NiFi.java:160) 2017-08-08 14:23:51,536 INFO [NiFi logging handler] org.apache.nifi.StdOut at org.apache.nifi.NiFi.main(NiFi.java:267) 2017-08-08 14:23:51,536 INFO [NiFi logging handler] org.apache.nifi.StdOut Caused by: java.nio.channels.UnresolvedAddressException: null 2017-08-08 14:23:51,536 INFO [NiFi logging handler] org.apache.nifi.StdOut at sun.nio.ch.Net.checkAddress(Net.java:101) 2017-08-08 14:23:51,536 INFO [NiFi logging handler] org.apache.nifi.StdOut at sun.nio.ch.ServerSocketChannelImpl.bind(ServerSocketChannelImpl.java:218) 2017-08-08 14:23:51,536 INFO [NiFi logging handler] org.apache.nifi.StdOut at sun.nio.ch.ServerSocketAdaptor.bind(ServerSocketAdaptor.java:74) 2017-08-08 14:23:51,536 INFO [NiFi logging handler] org.apache.nifi.StdOut ... 9 common frames omitted Michael Knapp ________________________________________________________ The information contained in this e-mail is confidential and/or proprietary to Capital One and/or its affiliates and may only be used solely in performance of work or services for Capital One. 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