Elasticsearch: Cannot start Elasticsearch with non loopback address

Created on 14 Aug 2016  Â·  25Comments  Â·  Source: elastic/elasticsearch

Elastic 5a5
0 plugs
java 8u60
Amazon Linux AMI 2016.03

issue
When setting Elastic to a non local loop back ip, elasticserch fails to start

reproduce
elastic config -> network.host: network.host: 0.0.0.0
Starting elasticsearch: [FAILED]

logs:

[2016-08-14 01:48:54,120][INFO ][plugins                  ] [egvE2n6] no plugins loaded
[2016-08-14 01:48:56,096][INFO ][node                     ] [egvE2n6] initialized
[2016-08-14 01:48:56,097][INFO ][node                     ] [egvE2n6] starting ...
[2016-08-14 01:48:56,194][INFO ][transport                ] [egvE2n6] publish_address {10.38.164.205:9300}, bound_addresses {[::]:9300}
[2016-08-14 01:48:56,198][INFO ][bootstrap                ] [egvE2n6] bound or publishing to a non-loopback or non-link-local address, enforcing bootstrap checks
[2016-08-14 01:48:56,200][ERROR][bootstrap                ] [egvE2n6] Exception
java.lang.RuntimeException: bootstrap checks failed
initial heap size [268435456] not equal to maximum heap size [2147483648]; this can cause resize pauses and prevents mlockall from locking the entire heap
please set [discovery.zen.minimum_master_nodes] to a majority of the number of master eligible nodes in your cluster
    at org.elasticsearch.bootstrap.BootstrapCheck.check(BootstrapCheck.java:132)
    at org.elasticsearch.bootstrap.BootstrapCheck.check(BootstrapCheck.java:85)
    at org.elasticsearch.bootstrap.BootstrapCheck.check(BootstrapCheck.java:65)
    at org.elasticsearch.bootstrap.Bootstrap$5.validateNodeBeforeAcceptingRequests(Bootstrap.java:178)
    at org.elasticsearch.node.Node.start(Node.java:471)
    at org.elasticsearch.bootstrap.Bootstrap.start(Bootstrap.java:193)
    at org.elasticsearch.bootstrap.Bootstrap.init(Bootstrap.java:257)
    at org.elasticsearch.bootstrap.Elasticsearch.init(Elasticsearch.java:101)
    at org.elasticsearch.bootstrap.Elasticsearch.execute(Elasticsearch.java:96)
    at org.elasticsearch.cli.SettingCommand.execute(SettingCommand.java:54)
    at org.elasticsearch.cli.Command.mainWithoutErrorHandling(Command.java:88)
    at org.elasticsearch.cli.Command.main(Command.java:54)
    at org.elasticsearch.bootstrap.Elasticsearch.main(Elasticsearch.java:75)
    at org.elasticsearch.bootstrap.Elasticsearch.main(Elasticsearch.java:68)
    Suppressed: java.lang.IllegalStateException: initial heap size [268435456] not equal to maximum heap size [2147483648]; this can cause resize pauses and prevents mlockall from locking the entire heap
        at java.util.stream.ReferencePipeline$3$1.accept(Unknown Source)
        at java.util.ArrayList$ArrayListSpliterator.forEachRemaining(Unknown Source)
        at java.util.stream.AbstractPipeline.copyInto(Unknown Source)
        at java.util.stream.AbstractPipeline.wrapAndCopyInto(Unknown Source)
        at java.util.stream.ForEachOps$ForEachOp.evaluateSequential(Unknown Source)
        at java.util.stream.ForEachOps$ForEachOp$OfRef.evaluateSequential(Unknown Source)
        at java.util.stream.AbstractPipeline.evaluate(Unknown Source)
        at java.util.stream.ReferencePipeline.forEach(Unknown Source)
        at org.elasticsearch.bootstrap.BootstrapCheck.check(BootstrapCheck.java:133)
        ... 13 more
    Suppressed: java.lang.IllegalStateException: please set [discovery.zen.minimum_master_nodes] to a majority of the number of master eligible nodes in your cluster
        at java.util.stream.ReferencePipeline$3$1.accept(Unknown Source)
        at java.util.ArrayList$ArrayListSpliterator.forEachRemaining(Unknown Source)
        at java.util.stream.AbstractPipeline.copyInto(Unknown Source)
        at java.util.stream.AbstractPipeline.wrapAndCopyInto(Unknown Source)
        at java.util.stream.ForEachOps$ForEachOp.evaluateSequential(Unknown Source)
        at java.util.stream.ForEachOps$ForEachOp$OfRef.evaluateSequential(Unknown Source)
        at java.util.stream.AbstractPipeline.evaluate(Unknown Source)
        at java.util.stream.ReferencePipeline.forEach(Unknown Source)
        at org.elasticsearch.bootstrap.BootstrapCheck.check(BootstrapCheck.java:133)
        ... 13 more
[2016-08-14 01:48:56,202][WARN ][bootstrap                ] [] uncaught exception in thread [main]
org.elasticsearch.bootstrap.StartupError: java.lang.RuntimeException: bootstrap checks failed
initial heap size [268435456] not equal to maximum heap size [2147483648]; this can cause resize pauses and prevents mlockall from locking the entire heap
please set [discovery.zen.minimum_master_nodes] to a majority of the number of master eligible nodes in your cluster
    at org.elasticsearch.bootstrap.Elasticsearch.init(Elasticsearch.java:105)
    at org.elasticsearch.bootstrap.Elasticsearch.execute(Elasticsearch.java:96)
    at org.elasticsearch.cli.SettingCommand.execute(SettingCommand.java:54)
    at org.elasticsearch.cli.Command.mainWithoutErrorHandling(Command.java:88)
    at org.elasticsearch.cli.Command.main(Command.java:54)
    at org.elasticsearch.bootstrap.Elasticsearch.main(Elasticsearch.java:75)
    at org.elasticsearch.bootstrap.Elasticsearch.main(Elasticsearch.java:68)
Caused by: java.lang.RuntimeException: bootstrap checks failed
initial heap size [268435456] not equal to maximum heap size [2147483648]; this can cause resize pauses and prevents mlockall from locking the entire heap
please set [discovery.zen.minimum_master_nodes] to a majority of the number of master eligible nodes in your cluster
    at org.elasticsearch.bootstrap.BootstrapCheck.check(BootstrapCheck.java:132)
    at org.elasticsearch.bootstrap.BootstrapCheck.check(BootstrapCheck.java:85)
    at org.elasticsearch.bootstrap.BootstrapCheck.check(BootstrapCheck.java:65)
    at org.elasticsearch.bootstrap.Bootstrap$5.validateNodeBeforeAcceptingRequests(Bootstrap.java:178)
    at org.elasticsearch.node.Node.start(Node.java:471)
    at org.elasticsearch.bootstrap.Bootstrap.start(Bootstrap.java:193)
    at org.elasticsearch.bootstrap.Bootstrap.init(Bootstrap.java:257)
    at org.elasticsearch.bootstrap.Elasticsearch.init(Elasticsearch.java:101)
    ... 6 more
    Suppressed: java.lang.IllegalStateException: initial heap size [268435456] not equal to maximum heap size [2147483648]; this can cause resize pauses and prevents mlockall from locking the entire heap
        at java.util.stream.ReferencePipeline$3$1.accept(Unknown Source)
        at java.util.ArrayList$ArrayListSpliterator.forEachRemaining(Unknown Source)
        at java.util.stream.AbstractPipeline.copyInto(Unknown Source)
        at java.util.stream.AbstractPipeline.wrapAndCopyInto(Unknown Source)
        at java.util.stream.ForEachOps$ForEachOp.evaluateSequential(Unknown Source)
        at java.util.stream.ForEachOps$ForEachOp$OfRef.evaluateSequential(Unknown Source)
        at java.util.stream.AbstractPipeline.evaluate(Unknown Source)
        at java.util.stream.ReferencePipeline.forEach(Unknown Source)
        at org.elasticsearch.bootstrap.BootstrapCheck.check(BootstrapCheck.java:133)
        ... 13 more
    Suppressed: java.lang.IllegalStateException: please set [discovery.zen.minimum_master_nodes] to a majority of the number of master eligible nodes in your cluster
        at java.util.stream.ReferencePipeline$3$1.accept(Unknown Source)
        at java.util.ArrayList$ArrayListSpliterator.forEachRemaining(Unknown Source)
        at java.util.stream.AbstractPipeline.copyInto(Unknown Source)
        at java.util.stream.AbstractPipeline.wrapAndCopyInto(Unknown Source)
        at java.util.stream.ForEachOps$ForEachOp.evaluateSequential(Unknown Source)
        at java.util.stream.ForEachOps$ForEachOp$OfRef.evaluateSequential(Unknown Source)
        at java.util.stream.AbstractPipeline.evaluate(Unknown Source)
        at java.util.stream.ReferencePipeline.forEach(Unknown Source)
        at org.elasticsearch.bootstrap.BootstrapCheck.check(BootstrapCheck.java:133)
        ... 13 more
[2016-08-14 01:48:56,203][INFO ][node                     ] [egvE2n6] stopping ...
[2016-08-14 01:48:56,217][INFO ][node                     ] [egvE2n6] stopped
[2016-08-14 01:48:56,217][INFO ][node                     ] [egvE2n6] closing ...
[2016-08-14 01:48:56,229][INFO ][node                     ] [egvE2n6] closed
picture danm

Most helpful comment

Worked on my AWS Linux Machine

cluster.name: myES_Cluster
node.name: ESNODE_CYR
node.master: true
node.data: true
transport.host: localhost
transport.tcp.port: 9300
http.port: 9200
network.host: 0.0.0.0
discovery.zen.minimum_master_nodes: 2

I have tried with this on the elasticsearch.yml (key:value) and worked fine for me. But it takes 2 days to fix it :wink: :slight_smile: , going on with ES Doc is so tough.

picture cyrilcyril70 on 1 Feb 2017
👍65 🎉19 ❤16 🚀7

All 25 comments

Do the things it says and it'll start.

On Aug 13, 2016 9:59 PM, "Daniel Morrison" [email protected] wrote:

Elastic 5a5
0 plugs
java 8u60
Amazon Linux AMI 2016.03

issue
When setting Elastic to a non local loop back ip, elasticserch fails to
start

reproduce
elastic config -> network.host: network.host: 0.0.0.0
Starting elasticsearch: [FAILED]

logs:

[2016-08-14 01:48:54,120][INFO ][plugins ] [egvE2n6]
no plugins loaded
[2016-08-14 01:48:56,096][INFO ][node ] [egvE2n6]
initialized
[2016-08-14 01:48:56,097][INFO ][node ] [egvE2n6]
starting ...
[2016-08-14 01:48:56,194][INFO ][transport ] [egvE2n6]
publish_address {10.38.164.205:9300}, bound_addresses {[::]:9300}
[2016-08-14 01:48:56,198][INFO ][bootstrap ] [egvE2n6]
bound or publishing to a non-loopback or non-link-local address,
enforcing bootstrap checks
[2016-08-14 01:48:56,200][ERROR][bootstrap ] [egvE2n6] Exception
java.lang.RuntimeException: bootstrap checks failed
initial heap size [268435456] not equal to maximum heap size
[2147483648]; this can cause resize pauses and prevents mlockall from
locking the entire heap
please set [discovery.zen.minimum_master_nodes] to a majority of the
number of master eligible nodes in your cluster
at org.elasticsearch.bootstrap.BootstrapCheck.check(BootstrapCheck.java:132)
at org.elasticsearch.bootstrap.BootstrapCheck.check(BootstrapCheck.java:85)
at org.elasticsearch.bootstrap.BootstrapCheck.check(BootstrapCheck.java:65)
at org.elasticsearch.bootstrap.Bootstrap$5.validateNodeBeforeAcceptingRequests(Bootstrap.java:178)
at org.elasticsearch.node.Node.start(Node.java:471)
at org.elasticsearch.bootstrap.Bootstrap.start(Bootstrap.java:193)
at org.elasticsearch.bootstrap.Bootstrap.init(Bootstrap.java:257)
at org.elasticsearch.bootstrap.Elasticsearch.init(Elasticsearch.java:101)
at org.elasticsearch.bootstrap.Elasticsearch.execute(Elasticsearch.java:96)
at org.elasticsearch.cli.SettingCommand.execute(SettingCommand.java:54)
at org.elasticsearch.cli.Command.mainWithoutErrorHandling(Command.java:88)
at org.elasticsearch.cli.Command.main(Command.java:54)
at org.elasticsearch.bootstrap.Elasticsearch.main(Elasticsearch.java:75)
at org.elasticsearch.bootstrap.Elasticsearch.main(Elasticsearch.java:68)
Suppressed: java.lang.IllegalStateException: initial heap size
[268435456] not equal to maximum heap size [2147483648]; this can
cause resize pauses and prevents mlockall from locking the entire heap
at java.util.stream.ReferencePipeline$3$1.accept(Unknown Source)
at java.util.ArrayList$ArrayListSpliterator.forEachRemaining(Unknown
Source)
at java.util.stream.AbstractPipeline.copyInto(Unknown Source)
at java.util.stream.AbstractPipeline.wrapAndCopyInto(Unknown Source)
at java.util.stream.ForEachOps$ForEachOp.evaluateSequential(Unknown
Source)
at java.util.stream.ForEachOps$ForEachOp$OfRef.evaluateSequential(Unknown
Source)
at java.util.stream.AbstractPipeline.evaluate(Unknown Source)
at java.util.stream.ReferencePipeline.forEach(Unknown Source)
at org.elasticsearch.bootstrap.BootstrapCheck.check(BootstrapCheck.java:133)
... 13 more
Suppressed: java.lang.IllegalStateException: please set
[discovery.zen.minimum_master_nodes] to a majority of the number of
master eligible nodes in your cluster
at java.util.stream.ReferencePipeline$3$1.accept(Unknown Source)
at java.util.ArrayList$ArrayListSpliterator.forEachRemaining(Unknown
Source)
at java.util.stream.AbstractPipeline.copyInto(Unknown Source)
at java.util.stream.AbstractPipeline.wrapAndCopyInto(Unknown Source)
at java.util.stream.ForEachOps$ForEachOp.evaluateSequential(Unknown
Source)
at java.util.stream.ForEachOps$ForEachOp$OfRef.evaluateSequential(Unknown
Source)
at java.util.stream.AbstractPipeline.evaluate(Unknown Source)
at java.util.stream.ReferencePipeline.forEach(Unknown Source)
at org.elasticsearch.bootstrap.BootstrapCheck.check(BootstrapCheck.java:133)
... 13 more
[2016-08-14 01:48:56,202][WARN ][bootstrap ] []
uncaught exception in thread [main]
org.elasticsearch.bootstrap.StartupError: java.lang.RuntimeException:
bootstrap checks failed
initial heap size [268435456] not equal to maximum heap size
[2147483648]; this can cause resize pauses and prevents mlockall from
locking the entire heap
please set [discovery.zen.minimum_master_nodes] to a majority of the
number of master eligible nodes in your cluster
at org.elasticsearch.bootstrap.Elasticsearch.init(Elasticsearch.java:105)
at org.elasticsearch.bootstrap.Elasticsearch.execute(Elasticsearch.java:96)
at org.elasticsearch.cli.SettingCommand.execute(SettingCommand.java:54)
at org.elasticsearch.cli.Command.mainWithoutErrorHandling(Command.java:88)
at org.elasticsearch.cli.Command.main(Command.java:54)
at org.elasticsearch.bootstrap.Elasticsearch.main(Elasticsearch.java:75)
at org.elasticsearch.bootstrap.Elasticsearch.main(Elasticsearch.java:68)
Caused by: java.lang.RuntimeException: bootstrap checks failed
initial heap size [268435456] not equal to maximum heap size
[2147483648]; this can cause resize pauses and prevents mlockall from
locking the entire heap
please set [discovery.zen.minimum_master_nodes] to a majority of the
number of master eligible nodes in your cluster
at org.elasticsearch.bootstrap.BootstrapCheck.check(BootstrapCheck.java:132)
at org.elasticsearch.bootstrap.BootstrapCheck.check(BootstrapCheck.java:85)
at org.elasticsearch.bootstrap.BootstrapCheck.check(BootstrapCheck.java:65)
at org.elasticsearch.bootstrap.Bootstrap$5.validateNodeBeforeAcceptingRequests(Bootstrap.java:178)
at org.elasticsearch.node.Node.start(Node.java:471)
at org.elasticsearch.bootstrap.Bootstrap.start(Bootstrap.java:193)
at org.elasticsearch.bootstrap.Bootstrap.init(Bootstrap.java:257)
at org.elasticsearch.bootstrap.Elasticsearch.init(Elasticsearch.java:101)
... 6 more
Suppressed: java.lang.IllegalStateException: initial heap size
[268435456] not equal to maximum heap size [2147483648]; this can
cause resize pauses and prevents mlockall from locking the entire heap
at java.util.stream.ReferencePipeline$3$1.accept(Unknown Source)
at java.util.ArrayList$ArrayListSpliterator.forEachRemaining(Unknown
Source)
at java.util.stream.AbstractPipeline.copyInto(Unknown Source)
at java.util.stream.AbstractPipeline.wrapAndCopyInto(Unknown Source)
at java.util.stream.ForEachOps$ForEachOp.evaluateSequential(Unknown
Source)
at java.util.stream.ForEachOps$ForEachOp$OfRef.evaluateSequential(Unknown
Source)
at java.util.stream.AbstractPipeline.evaluate(Unknown Source)
at java.util.stream.ReferencePipeline.forEach(Unknown Source)
at org.elasticsearch.bootstrap.BootstrapCheck.check(BootstrapCheck.java:133)
... 13 more
Suppressed: java.lang.IllegalStateException: please set
[discovery.zen.minimum_master_nodes] to a majority of the number of
master eligible nodes in your cluster
at java.util.stream.ReferencePipeline$3$1.accept(Unknown Source)
at java.util.ArrayList$ArrayListSpliterator.forEachRemaining(Unknown
Source)
at java.util.stream.AbstractPipeline.copyInto(Unknown Source)
at java.util.stream.AbstractPipeline.wrapAndCopyInto(Unknown Source)
at java.util.stream.ForEachOps$ForEachOp.evaluateSequential(Unknown
Source)
at java.util.stream.ForEachOps$ForEachOp$OfRef.evaluateSequential(Unknown
Source)
at java.util.stream.AbstractPipeline.evaluate(Unknown Source)
at java.util.stream.ReferencePipeline.forEach(Unknown Source)
at org.elasticsearch.bootstrap.BootstrapCheck.check(BootstrapCheck.java:133)
... 13 more
[2016-08-14 01:48:56,203][INFO ][node ] [egvE2n6]
stopping ...
[2016-08-14 01:48:56,217][INFO ][node ] [egvE2n6] stopped
[2016-08-14 01:48:56,217][INFO ][node ] [egvE2n6]
closing ...
[2016-08-14 01:48:56,229][INFO ][node ] [egvE2n6] closed

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nik9000 picture nik9000 on 14 Aug 2016
👎49 👀1

Yes. See also https://github.com/elastic/elasticsearch/issues/19868

dadoonet picture dadoonet on 14 Aug 2016

why do you people keep making these pointless changes and then make others sound stupid for reporting it!

mingfang picture mingfang on 10 Nov 2016
👍40 🎉28 😄7

@mingfang The checks have a point; we've explained their purpose on our blog and in our docs.

jasontedor picture jasontedor on 10 Nov 2016
👍1

@jasontedor Thanks for the links.

mingfang picture mingfang on 10 Nov 2016

@mingfang You are very welcome. :smile:

jasontedor picture jasontedor on 10 Nov 2016

I don't care about what the doc or explain, just one question:
will listening on 0.0.0.0, and how to do that?

junjiemars picture junjiemars on 30 Dec 2016
👍32 🎉11 😄7 😕2

Worked on my AWS Linux Machine

cluster.name: myES_Cluster
node.name: ESNODE_CYR
node.master: true
node.data: true
transport.host: localhost
transport.tcp.port: 9300
http.port: 9200
network.host: 0.0.0.0
discovery.zen.minimum_master_nodes: 2

I have tried with this on the elasticsearch.yml (key:value) and worked fine for me. But it takes 2 days to fix it :wink: :slight_smile: , going on with ES Doc is so tough.

cyrilcyril70 picture cyrilcyril70 on 1 Feb 2017
👍65 🎉19 ❤16 🚀7

thanks a lot cyrilcyril70, this saved days of frustration for me :)

Question to the developers: Couldn't a minimal, working (but unsafe and inefficient) configuration (like the one presented) be included in the standard installations? Possibly a warning before using it could be implemented...

treue picture treue on 9 Feb 2017
👍3

Thank you cyrilcyril70. You really saved me from going into frustration mode :)

mallan-patil picture mallan-patil on 17 Feb 2017

Thanks cyrilcyril70! works like a charm!

BTW I have tried it out locally and found out that the problem occurs due to settings of transport host/tcp.port.
configuration can be reduced to
transport.host: localhost
transport.tcp.port: 9300
http.port: 9200
network.host: 0.0.0.0

dmitrygrig picture dmitrygrig on 3 Mar 2017
👍40 ❤19 🎉10

Thanks @cyrilcyril70 Is there a way I can change transport.host to non-local?

CuriousVini picture CuriousVini on 11 Mar 2017

yah I totally don't get this non-local-address who thought is was a good idea. anywah.

I can add localhost but when I add in the ip I want it bound to it says it is a non-loopback whicih is correct non-link-local address which is false.

The config works in 5.1 and now with this Bootcheck change it is causing me problems. Waz sup?

[2017-03-19T17:03:51,399][INFO ][o.e.t.TransportService ] [hd1melk24lx-es-client-1] publish_address {10.32.42.204:9305}, bound_addresses {10.32.42.204:9305}
[2017-03-19T17:03:51,403][INFO ][o.e.b.BootstrapChecks ] [hd1melk24lx-es-client-1] bound or publishing to a non-loopback or non-link-local address, enforcing bootstrap checks
[2017-03-19T17:03:51,405][ERROR][o.e.b.Bootstrap ] [hd1melk24lx-es-client-1] node validation exception
bootstrap checks failed
system call filters failed to install; check the logs and fix your configuration or disable system call filters at your own risk

bond0 Link encap:Ethernet HWaddr 00:17:A4:77:08:04
inet addr:10.32.42.204 Bcast:10.32.42.255 Mask:255.255.255.0
inet6 addr: fe80::217:a4ff:fe77:804/64 Scope:Link
UP BROADCAST RUNNING MASTER MULTICAST MTU:1500 Metric:1

network.host: 10.32.42.204
transport.host: 10.32.42.204
transport.tcp.port: 9305-9310
http.port: 9205-9210

eperry picture eperry on 19 Mar 2017
👍1

@eperry It's here:

system call filters failed to install; check the logs and fix your configuration or disable system call filters at your own risk

If you look higher in your logs, you'll see a message explaining why the system call filters failed to install. You can read more about this bootstrap check in the docs.

If you have additional questions, please start a topic on the forum. Elastic reserves GitHub for verified bug reports and feature requests and prefers to keep general discussion off of issues, especially closed issues.

jasontedor picture jasontedor on 19 Mar 2017

opps did not see that this was closed but still very POOR messages there are no errors and if you can log that it failed to load you can repeat the actual problem validation.

But anyway it is a closed issue I will go create a new thread.

eperry picture eperry on 19 Mar 2017

Reduced to this:

transport.host: localhost
network.host: 0.0.0.0
ChipmunkV picture ChipmunkV on 2 May 2017
👍35 🎉10 ❤6 🚀2

Díky moc cyrilcyril70

chomenko picture chomenko on 1 Aug 2017

This worked for me:
in elasticsearch.yml

http.port: 9201
#http.bind_host: 192.168.1.172 #works
http.publish_host: 192.168.1.172 #by itself does not work
http.host: 192.168.1.172 #works alone

on /etc/hosts

192.168.1.172 mytestnode
pedrosk picture pedrosk on 28 Nov 2017

Basically, you need to comment network.host to be able to use elasticsearch on non-loopback address.

StrikerASD picture StrikerASD on 6 Apr 2018

What a stupid configuration !!!! How do you think about developer's user experience?

liuzexin picture liuzexin on 25 Jun 2018
👎8 😕4 👍1

There really needs to be an option for (if there isn't one already):

bootstrapCheck.enforcing: 0
AddoSolutions picture AddoSolutions on 6 May 2019
👍4

In my setup problem was here:

wrong config

environment:
  discovery.type: single-node
  transport.host: localhost
  transport.tcp.port: 9300
  http.port: 9200
  http.host: 0.0.0.0

correct config

environment:
  - discovery.type=single-node
  - transport.host=localhost
  - transport.tcp.port=9300
  - http.port=9200
  - http.host=0.0.0.0
desprit picture desprit on 29 Jul 2019
👍5 ❤2 🎉2

Elastisearch comes "broken by default". In order to have it listen on a network socket, you have to add two entries to your elastisearch.yml file:

C:ProgramDataElasticElasticsearchconfigelasticsearch.yml:

network.host: 0.0.0.0
discovery.seed_hosts: []

The first option will have Elastisearch open an actual network listening socket.
The second option is needed to satisfy something. Nobody cares what the option is; it's just needed to make it shut up and do its job.

JackTrapper picture JackTrapper on 31 Jan 2020
👍1

The second option is needed to satisfy _something_. Nobody cares what the option is; it's just needed to make it shut up and do its job.

That's not really true. It is needed as an explicit indication whether you intend this node to join a larger cluster or not. Elasticsearch cannot know this for certain either way, and it cannot guess without risking data loss. In the default "development mode" configuration it does guess and risks data loss as a result, but this is not appropriate behaviour for production clusters.

DaveCTurner picture DaveCTurner on 31 Jan 2020

It is needed as an explicit indication whether you intend this node to join a larger cluster or not. Elasticsearch cannot know this for certain either way, and it cannot guess without risking data loss.

Elastisearch can know this for certain:

  • there is only one node
  • therefore there is only one node

If there was more than one node then: there would be more than one node.

It's not a technical issue: it's a user-interface one:

  • The developers would like to remind users that they only have one copy of the data.
  • Which i already know: because i only have one copy of Elastisearch running

So i have to dutifully tell Elastisearch what it already knew. I know it knew this because it told me. And we end up being circular:

  • [Me]: What are you telling me?
  • [Elastisearch]: Something you already know.
  • [Me]: Then why are you telling me?
  • [Elastisearch]: Because I don't know.
JackTrapper picture JackTrapper on 1 Feb 2020
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