I’m trying to run Usergrid following the instructions on the website. I managed to get the requirements up and running (as far as I know), but running Usergrid/Tomcat throws:

root@usergrid:~# systemctl start tomcat
08:01:01,536  WARN netty:620 - [default] exception caught on transport layer [[id: 0x76523f9a]], closing connection
java.net.UnknownHostException: 192.168.2.237:9200
        at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:184)
        at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
        at java.net.Socket.connect(Socket.java:613)
        at org.elasticsearch.common.netty.channel.socket.oio.OioClientSocketPipelineSink.connect(OioClientSocketPipelineSink.java:109)
        at org.elasticsearch.common.netty.channel.socket.oio.OioClientSocketPipelineSink.eventSunk(OioClientSocketPipelineSink.java:69)
        at org.elasticsearch.common.netty.channel.DefaultChannelPipeline.sendDownstream(DefaultChannelPipeline.java:574)
        at org.elasticsearch.common.netty.channel.Channels.connect(Channels.java:634)
        at org.elasticsearch.common.netty.channel.AbstractChannel.connect(AbstractChannel.java:207)
        at org.elasticsearch.common.netty.bootstrap.ClientBootstrap.connect(ClientBootstrap.java:229)
        at org.elasticsearch.common.netty.bootstrap.ClientBootstrap.connect(ClientBootstrap.java:182)
        at org.elasticsearch.transport.netty.NettyTransport.connectToChannelsLight(NettyTransport.java:769)
        at org.elasticsearch.transport.netty.NettyTransport.connectToNode(NettyTransport.java:737)
        at org.elasticsearch.transport.netty.NettyTransport.connectToNodeLight(NettyTransport.java:709)
        at org.elasticsearch.transport.TransportService.connectToNodeLight(TransportService.java:154)
        at org.elasticsearch.discovery.zen.ping.unicast.UnicastZenPing$3.run(UnicastZenPing.java:376)
        at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
        at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
        at java.lang.Thread.run(Thread.java:750)
^C
root@usergrid:~# curl -v http://192.168.2.237:9200
*   Trying 192.168.2.237:9200...
* Connected to 192.168.2.237 (192.168.2.237) port 9200 (#0)
> GET / HTTP/1.1
> Host: 192.168.2.237:9200
> User-Agent: curl/7.88.1
> Accept: */*
> 
< HTTP/1.1 200 OK
< Content-Type: application/json; charset=UTF-8
< Content-Length: 334
< 
{
  "status" : 200,
  "name" : "Pisces",
  "cluster_name" : "elasticsearch",
  "version" : {
    "number" : "1.4.0",
    "build_hash" : "bc94bd81298f81c656893ab1ddddd30a99356066",
    "build_timestamp" : "2014-11-05T14:26:12Z",
    "build_snapshot" : false,
    "lucene_version" : "4.10.2"
  },
  "tagline" : "You Know, for Search"
}
* Connection #0 to host 192.168.2.237 left intact
root@usergrid:~#