Connection refused on new RHEL7 installation

Elastic Stack Elasticsearch
1

Hi, I'm new to ELK and just installed elasticsearch on RHEL7 with default configs. I can run curl successfully to http://127.0.0.1:9200 or http://localhost:9200, but not with http://host1:9200:
$ curl http://host1 --verbose

  • About to connect() to host1 port 9200 (#0)
  • Trying nn.nn.nn.nn...
  • Connection refused
  • Failed connect to host1:9200; Connection refused
  • Closing connection 0
    curl: (7) Failed connect to host1:9200; Connection refused

Here's how the log looks like:
[2018-02-19T15:29:08,589][INFO ][o.e.n.Node ] [] initializing ...
[2018-02-19T15:29:08,682][INFO ][o.e.e.NodeEnvironment ] [lGXEuBD] using [1] data paths, mounts [[/app (/dev/mapper/vg_root-lv_app)]], net usable_space [44.7gb], net total_space [49gb], spins? [possibly], types [ext4]
[2018-02-19T15:29:08,682][INFO ][o.e.e.NodeEnvironment ] [lGXEuBD] heap size [1.9gb], compressed ordinary object pointers [true]
[2018-02-19T15:29:08,683][INFO ][o.e.n.Node ] node name [lGXEuBD] derived from node ID [lGXEuBDvStyhHnM2dumb9A]; set [node.name] to override
[2018-02-19T15:29:08,684][INFO ][o.e.n.Node ] version[5.6.7], pid[42651], build[4669214/2018-01-25T21:14:50.776Z], OS[Linux/3.10.0-693.17.1.el7.x86_64/amd64], JVM[Oracle Corporation/Java HotSpot(TM) 64-Bit Server VM/1.8.0_144/25.144-b01]
[2018-02-19T15:29:08,684][INFO ][o.e.n.Node ] JVM arguments [-Xms2g, -Xmx2g, -XX:+UseConcMarkSweepGC, -XX:CMSInitiatingOccupancyFraction=75, -XX:+UseCMSInitiatingOccupancyOnly, -XX:+AlwaysPreTouch, -Xss1m, -Djava.awt.headless=true, -Dfile.encoding=UTF-8, -Djna.nosys=true, -Djdk.io.permissionsUseCanonicalPath=true, -Dio.netty.noUnsafe=true, -Dio.netty.noKeySetOptimization=true, -Dio.netty.recycler.maxCapacityPerThread=0, -Dlog4j.shutdownHookEnabled=false, -Dlog4j2.disable.jmx=true, -Dlog4j.skipJansi=true, -XX:+HeapDumpOnOutOfMemoryError, -Des.path.home=/app/elk-stack/elasticsearch/elasticsearch-5.6.7]
[2018-02-19T15:29:09,603][INFO ][o.e.p.PluginsService ] [lGXEuBD] loaded module [aggs-matrix-stats]
[2018-02-19T15:29:09,603][INFO ][o.e.p.PluginsService ] [lGXEuBD] loaded module [ingest-common]
[2018-02-19T15:29:09,603][INFO ][o.e.p.PluginsService ] [lGXEuBD] loaded module [lang-expression]
[2018-02-19T15:29:09,603][INFO ][o.e.p.PluginsService ] [lGXEuBD] loaded module [lang-groovy]
[2018-02-19T15:29:09,603][INFO ][o.e.p.PluginsService ] [lGXEuBD] loaded module [lang-mustache]
[2018-02-19T15:29:09,603][INFO ][o.e.p.PluginsService ] [lGXEuBD] loaded module [lang-painless]
[2018-02-19T15:29:09,603][INFO ][o.e.p.PluginsService ] [lGXEuBD] loaded module [parent-join]
[2018-02-19T15:29:09,604][INFO ][o.e.p.PluginsService ] [lGXEuBD] loaded module [percolator]
[2018-02-19T15:29:09,604][INFO ][o.e.p.PluginsService ] [lGXEuBD] loaded module [reindex]
[2018-02-19T15:29:09,604][INFO ][o.e.p.PluginsService ] [lGXEuBD] loaded module [transport-netty3]
[2018-02-19T15:29:09,604][INFO ][o.e.p.PluginsService ] [lGXEuBD] loaded module [transport-netty4]
[2018-02-19T15:29:09,605][INFO ][o.e.p.PluginsService ] [lGXEuBD] no plugins loaded
[2018-02-19T15:29:11,058][INFO ][o.e.d.DiscoveryModule ] [lGXEuBD] using discovery type [zen]
[2018-02-19T15:29:11,615][INFO ][o.e.n.Node ] initialized
[2018-02-19T15:29:11,615][INFO ][o.e.n.Node ] [lGXEuBD] starting ...
[2018-02-19T15:29:11,846][INFO ][o.e.t.TransportService ] [lGXEuBD] publish_address {127.0.0.1:9300}, bound_addresses {127.0.0.1:9300}
[2018-02-19T15:29:11,859][WARN ][o.e.b.BootstrapChecks ] [lGXEuBD] max virtual memory areas vm.max_map_count [65530] is too low, increase to at least [262144]
[2018-02-19T15:29:14,934][INFO ][o.e.c.s.ClusterService ] [lGXEuBD] new_master {lGXEuBD}{lGXEuBDvStyhHnM2dumb9A}{qj8ixIPzTvW-EHmcyALW0A}{127.0.0.1}{127.0.0.1:9300}, reason: zen-disco-elected-as-master ([0] nodes joined)
[2018-02-19T15:29:14,986][INFO ][o.e.g.GatewayService ] [lGXEuBD] recovered [0] indices into cluster_state
[2018-02-19T15:29:14,988][INFO ][o.e.h.n.Netty4HttpServerTransport] [lGXEuBD] publish_address {127.0.0.1:9200}, bound_addresses {127.0.0.1:9200}
[2018-02-19T15:29:14,988][INFO ][o.e.n.Node ] [lGXEuBD] started

There is no firewall on the server.

Any suggestions on what else to look at?

Thanks!

2

Look at the network.host config variable.

3

Thanks for the quick response...
I did try adding network.host and still got the error bootstrap checks failed:
[2018-02-19T16:00:47,659][INFO ][o.e.n.Node ] [lGXEuBD] starting ...
[2018-02-19T16:00:47,874][INFO ][o.e.t.TransportService ] [lGXEuBD] publish_address {192.168.41.6:9300}, bound_addresses {192.168.41.6:9300}
[2018-02-19T16:00:47,889][INFO ][o.e.b.BootstrapChecks ] [lGXEuBD] bound or publishing to a non-loopback address, enforcing bootstrap checks
ERROR: [1] bootstrap checks failed
[1]: max virtual memory areas vm.max_map_count [65530] is too low, increase to at least [262144]
[2018-02-19T16:00:47,896][INFO ][o.e.n.Node ] [lGXEuBD] stopping ...
[2018-02-19T16:00:47,936][INFO ][o.e.n.Node ] [lGXEuBD] stopped
[2018-02-19T16:00:47,936][INFO ][o.e.n.Node ] [lGXEuBD] closing ...
[2018-02-19T16:00:47,948][INFO ][o.e.n.Node ] [lGXEuBD] closed

Thanks!

4

Yep. You should also read https://www.elastic.co/guide/en/elasticsearch/reference/6.2/setup.html

5

Thank you!

We are now able to connect to elasticsearch after explicitly setting the following params:
transport.host
transport.tcp.port
network.host

6

You only need to set network.host the rest will inherit that.

7

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