Elasticsearch: Allow binding to multiple addresses

[nik9000]

Right now you can bind Elasticsearch to only a single address with either:

network.bind_host: "some_ip"

or

network.host: "some_ip"

It'd be convenient to be able to bind to multiple hosts like so:

network.bind_host: [ "some_ip", "some_other_ip" ]

In particular it'd allow the convenient configuration:

network.bind_host: [ "some_data_center_accessible_ip", "localhost" ]
network.publish_host: "some_data_center_accessible_ip"

Which would allow elasticsearch to respond to requests to localhost.

[rayward]

+1

When testing ES 2.0, I had to bind to 0.0.0.0 so that ES was accessible from both within and outside of my developer VM.

This should also apply to the http module.

[rmuir]

I plan to look into this, the code should easily support it, we just have to deal with the configuration to accept it.

I really really do not like people being forced to bind to all addresses when they really just want maybe two or three or whatever.

[vionemc]

Doesn't work on ElasticSearch 2.x

[rmuir]

has not been released.

[vionemc]

Ahh, so that's why. Thanks! Really looking forward to it.

[AseemKumar]

Has this been fixed? Running 2.3.4 and unable to specify multiple interfaces/addresses.

[jasontedor]

@AseemKumar Yes, it works fine in 2.3.4:

11:40:45 [jason:~] $ elasticsearch -d --network.bind_host=192.168.1.8,192.168.1.9
11:40:47 [jason:~] $ curl -XGET 192.168.1.8:9200/
{
  "name" : "Mutant X",
  "cluster_name" : "elasticsearch_jason",
  "version" : {
    "number" : "2.3.4",
    "build_hash" : "e455fd0c13dceca8dbbdbb1665d068ae55dabe3f",
    "build_timestamp" : "2016-06-30T11:24:31Z",
    "build_snapshot" : false,
    "lucene_version" : "5.5.0"
  },
  "tagline" : "You Know, for Search"
}
11:40:55 [jason:~] $ curl -XGET 192.168.1.9:9200/
{
  "name" : "Mutant X",
  "cluster_name" : "elasticsearch_jason",
  "version" : {
    "number" : "2.3.4",
    "build_hash" : "e455fd0c13dceca8dbbdbb1665d068ae55dabe3f",
    "build_timestamp" : "2016-06-30T11:24:31Z",
    "build_snapshot" : false,
    "lucene_version" : "5.5.0"
  },
  "tagline" : "You Know, for Search"
}

[AseemKumar]

Thanks @jasontedor . I specified the interfaces in my config and it only listens on the localhost

network.host: [_enp0s25_, _local_]

Do you know if only IPs can be provided or interface name as well?

[jasontedor]

@AseemKumar Do not specify as an array, but comma-delimited just as I showed above: network.host: _enp0s25_,_local_.

[clintongormley]

@jasontedor if you can't specify as an array, then that's a bug. we use arrays for a number of other settings. the comma-separated format is really for command line settings

[jasontedor]

@clintongormley I tested this, it does indeed work as an array, and it does work with interface names. I'm not sure why @AseemKumar reported an issue here.

@AseemKumar Can you share exactly what you entered for network.host, any other relevant settings from your configuration file, as well as the output of ifconfig?

[rmuir]

also if you run with DEBUG logging it prints a "java ifconfig". This is ifconfig as java sees the world.

[podollb]

I wrestled with this too (trying various formats of specifying multiple values), but I got it working using the array notation, but I needed to quote the values. So I think @AseemKumar needs to quote the values in his array: network.host: ["_enp0s25_", "_local_"] and then it will work. Otherwise, you could use the more specific configs via something like network.bind_host: ["_enp0s25_", "_local_"] and network.publish_host: _enp0s25_

[niemyjski]

I'm running 5.1.1 and I couldn't get it to bind correctly unless I did network.host: [ '10.2.0.7', '_local_' ].

/sbin/ifconfig
eth0      Link encap:Ethernet  HWaddr 00:0d:3a:10:55:07
          inet addr:10.2.0.7  Bcast:10.2.0.255  Mask:255.255.255.0

lo        Link encap:Local Loopback
          inet addr:127.0.0.1  Mask:255.0.0.0

lxcbr0    Link encap:Ethernet  HWaddr 00:16:3e:00:00:00
          inet addr:10.0.3.1  Bcast:0.0.0.0  Mask:255.255.255.0

I've never had to do this before in 1.7.5. Is this normal to bind just so you can access from localhost and 10.2.0.7 (local ip)

[jasontedor]

Yes. Elasticsearch binds to localhost only by default, and otherwise only what you explicitly configure.

[Sojoy]

I just tried out rayward's recommendation to ue 0.0.0.0 to bind to all available addresses and it works on ES 5.2.2

[madchap]

Just a quick note despite the issue being closed, I am not able to do something like (on 2.4.4). I am running under a coreos-kubernetes multi-vagrant setup.

network.host: [ '_local_' , '_site:ipv4_' ]

Getting an error like, and then the container fails.

Exception in thread "main" BindTransportException[Failed to resolve host null]; nested: UnknownHostException[[ '_local_': invalid IPv6 address];
Likely root cause: java.net.UnknownHostException: [ '_local_': invalid IPv6 address

[jasontedor]

@madchap I tested this and works fine. Are you sure that you input it correctly? I ask because the exception message indicates that it parsed whatever you input as [ '_local_'.

[madchap]

@jasontedor I tried to catch that to verify it, but could not really as the container is getting destroyed before I can actually get to what is being held in my env variable.

But I tend to believe you're right -- there must be something odd with the env variable interpolation I am missing. Thanks for your confirmation too. I've put 0.0.0.0 for now as I need to move on onto other stuff.

[pvledoux]

@madchap Did you could resolved that issue? I have a similar problem, I tried different things with no luck:

-network.host=_eth0_ #works

but

• network.host=[_eth0_,'192.168.100.40','X.X.X.X']

is not working. It tried with single quotes, double quotes around _eth0_.

[madchap]

@pvledoux, no I eventually did not after having tried what I think is every possibility. I haven't investigated any further. Maybe something related to the particular docker environment in my case?

[pvledoux]

@madchap Yes I'm docker too. I will investigate on at side when I have more time.

[SPodjasek]

@madchap @pvledoux Please try:

-e network.host='_site_,_local_'

it works for me

[lodinv]

v 7.0 network.host not work

[RockNHawk]

this works for me in elastic 7

@lodinv

network.host: '_site_,_local_'
node.name: "node-1"

discovery.seed_hosts: ["127.0.0.1", "[::1]"]

cluster.initial_master_nodes: ["node-1"]

[DundiVedantam]

http.host: 10.91.170.115
http.port: 9200
this works for me