networking - Unable to bind elasticsearch transport service to external interface

Question

I am trying to setup elasticsearch cluster with 2 virtual machines. I am not able to configure the cluster transport service with an external interface. I could able to use localhost:9300 as transport service, but I cannot use localhost URL to join the cluster. It is throwing an error when I use external interface name/IP to configure the cluster.

[2017-12-22T06:58:56,979][INFO ][o.e.t.TransportService   ] [node-1] publish_address {10.0.1.33:9300}, bound_addresses {10.0.1.33:9300}
[2017-12-22T06:58:56,997][INFO ][o.e.b.BootstrapChecks    ] [node-1] bound or publishing to a non-loopback or non-link-local address, enforcing bootstrap checks
[2017-12-22T06:58:57,002][ERROR][o.e.b.Bootstrap          ] [node-1] node validation exception
[2] bootstrap checks failed

My configuration:

cluster.name: ProductionCluster
node.name: node-1
network.host: 10.0.1.33
http.port: 9200
discovery.zen.ping.unicast.hosts: ["10.0.1.33","10.0.1.34"]
bootstrap.system_call_filter: false
path.data: /var/lib/elasticsearch
path.logs: /var/log/elasticsearch

Elasticsearch Version: 6.1

Answer 1

If you configure an external interface, you're considered to be in "production mode" and bootstrap checks are automatically enforced. Can you show which bootstrap checks are failing?

The error mentions that the max number of threads [2048] for user [elasticsearch] is too low and you need to increase to at least [4096]

You can find how to do it here: https://www.elastic.co/guide/en/elasticsearch/reference/current/max-number-threads-check.html