Unhelpful error when trying to bind to an unknown address

[DaveCTurner]

If I set network.host to an address that doesn't belong to my laptop then I get the message Failed to bind to [9300-9400] which is pretty mysterious. I think we should show the address to which we are trying to bind too.

$ cat elasticsearch-7.4.0/config/elasticsearch.yml | grep -ve '^#'
network.host: 192.168.0.1 # that's not my name
$ ifconfig | grep 192.168
	inet 192.168.1.139 netmask 0xffffff00 broadcast 192.168.1.255
	inet 192.168.1.179 netmask 0xffffff00 broadcast 192.168.1.255
$ elasticsearch-7.4.0/bin/elasticsearch
... snip
[2019-10-14T15:00:53,592][ERROR][o.e.b.Bootstrap          ] [Davids-MacBook-Pro-3.local] Exception
org.elasticsearch.transport.BindTransportException: Failed to bind to [9300-9400]
	at org.elasticsearch.transport.TcpTransport.bindToPort(TcpTransport.java:389) ~[elasticsearch-7.4.0.jar:7.4.0]
	at org.elasticsearch.transport.TcpTransport.bindServer(TcpTransport.java:355) ~[elasticsearch-7.4.0.jar:7.4.0]
	at org.elasticsearch.transport.netty4.Netty4Transport.doStart(Netty4Transport.java:139) ~[?:?]
	at org.elasticsearch.xpack.core.security.transport.netty4.SecurityNetty4Transport.doStart(SecurityNetty4Transport.java:81) ~[?:?]
	at org.elasticsearch.xpack.security.transport.netty4.SecurityNetty4ServerTransport.doStart(SecurityNetty4ServerTransport.java:43) ~[?:?]
	at org.elasticsearch.common.component.AbstractLifecycleComponent.start(AbstractLifecycleComponent.java:59) ~[elasticsearch-7.4.0.jar:7.4.0]
	at org.elasticsearch.transport.TransportService.doStart(TransportService.java:230) ~[elasticsearch-7.4.0.jar:7.4.0]
	at org.elasticsearch.common.component.AbstractLifecycleComponent.start(AbstractLifecycleComponent.java:59) ~[elasticsearch-7.4.0.jar:7.4.0]
	at org.elasticsearch.node.Node.start(Node.java:695) ~[elasticsearch-7.4.0.jar:7.4.0]
	at org.elasticsearch.bootstrap.Bootstrap.start(Bootstrap.java:273) ~[elasticsearch-7.4.0.jar:7.4.0]
	at org.elasticsearch.bootstrap.Bootstrap.init(Bootstrap.java:358) [elasticsearch-7.4.0.jar:7.4.0]
	at org.elasticsearch.bootstrap.Elasticsearch.init(Elasticsearch.java:159) [elasticsearch-7.4.0.jar:7.4.0]
	at org.elasticsearch.bootstrap.Elasticsearch.execute(Elasticsearch.java:150) [elasticsearch-7.4.0.jar:7.4.0]
	at org.elasticsearch.cli.EnvironmentAwareCommand.execute(EnvironmentAwareCommand.java:86) [elasticsearch-7.4.0.jar:7.4.0]
	at org.elasticsearch.cli.Command.mainWithoutErrorHandling(Command.java:125) [elasticsearch-cli-7.4.0.jar:7.4.0]
	at org.elasticsearch.cli.Command.main(Command.java:90) [elasticsearch-cli-7.4.0.jar:7.4.0]
	at org.elasticsearch.bootstrap.Elasticsearch.main(Elasticsearch.java:115) [elasticsearch-7.4.0.jar:7.4.0]
	at org.elasticsearch.bootstrap.Elasticsearch.main(Elasticsearch.java:92) [elasticsearch-7.4.0.jar:7.4.0]
Caused by: java.net.BindException: Can't assign requested address
	at sun.nio.ch.Net.bind0(Native Method) ~[?:?]
	at sun.nio.ch.Net.bind(Net.java:455) ~[?:?]
	at sun.nio.ch.Net.bind(Net.java:447) ~[?:?]
	at sun.nio.ch.ServerSocketChannelImpl.bind(ServerSocketChannelImpl.java:219) ~[?:?]
	at io.netty.channel.socket.nio.NioServerSocketChannel.doBind(NioServerSocketChannel.java:132) ~[?:?]
	at io.netty.channel.AbstractChannel$AbstractUnsafe.bind(AbstractChannel.java:551) ~[?:?]
	at io.netty.channel.DefaultChannelPipeline$HeadContext.bind(DefaultChannelPipeline.java:1345) ~[?:?]
	at io.netty.channel.AbstractChannelHandlerContext.invokeBind(AbstractChannelHandlerContext.java:503) ~[?:?]
	at io.netty.channel.AbstractChannelHandlerContext.bind(AbstractChannelHandlerContext.java:488) ~[?:?]
	at io.netty.channel.DefaultChannelPipeline.bind(DefaultChannelPipeline.java:984) ~[?:?]
	at io.netty.channel.AbstractChannel.bind(AbstractChannel.java:247) ~[?:?]
	at io.netty.bootstrap.AbstractBootstrap$2.run(AbstractBootstrap.java:355) ~[?:?]
	at io.netty.util.concurrent.AbstractEventExecutor.safeExecute(AbstractEventExecutor.java:163) ~[?:?]
	at io.netty.util.concurrent.SingleThreadEventExecutor.runAllTasks(SingleThreadEventExecutor.java:416) ~[?:?]
	at io.netty.channel.nio.NioEventLoop.run(NioEventLoop.java:515) ~[?:?]
	at io.netty.util.concurrent.SingleThreadEventExecutor$5.run(SingleThreadEventExecutor.java:918) ~[?:?]
	at io.netty.util.internal.ThreadExecutorMap$2.run(ThreadExecutorMap.java:74) ~[?:?]
	at java.lang.Thread.run(Thread.java:835) ~[?:?]
...

[elasticmachine]

Pinging @elastic/es-distributed (:Distributed/Network)

[mariaral]

Hi @DaveCTurner, @ywelsch ,

I submitted PR #51269 fixing this. Please take a look.