# Elasticsearch 5.2.0 unable to form cluster **URL:** \ **Category:** Elasticsearch\ **Created:** [March 1, 2017, 5:14pm UTC](https://discuss.elastic.co/t/elasticsearch-5-2-0-unable-to-form-cluster/77031 "2017-03-01T17:14:45Z")\ **Posts on this page:** 10\ **Page:** 1
**Author:** ![Neuron\_Ring](https://avatars.discourse-cdn.com/v4/letter/n/6a8cbe/32.png) [@Neuron\_Ring](https://discuss.elastic.co/u/Neuron_Ring)\ **Post date:** [March 1, 2017, 5:14pm UTC](https://discuss.elastic.co/t/elasticsearch-5-2-0-unable-to-form-cluster/77031/1 "2017-03-01T17:14:45Z")
Hi Team, I have difficulty setting up Elasticsearch cluster in version 5.2.0. This is the first time i am using Version 5.x. I have been happily using v2.4 so far. Please find my elasticsearch.yml file below. I have the same settings on both the nodes (trying to build a 2 node cluster) However, if i specify this setting, my node will start without any issues, but as a standalone node. > http.host: 10.1.1.10 > http.port: 9200 i understand that this transport.host setting wont form a cluster, i even tried without this setting. it still doesnt work. > transport.host: localhost > transport.tcp.port: 9300 If i remove transport.host from the setting, i am getting bootstrap errors. I have provided the full elasticsearch.yml (using the same settings on both the nodes) and my log file.... ``` cluster.name: elasticsearch cluster.routing.allocation.awareness.force.cloud.values: zone node.name: Elkprod1 node.master: true node.data: true node.max_local_storage_nodes: 1 path.conf: /usr/local/etc/elasticsearch path.data: /data/elasticsearch path.logs: /usr/local/var/log/elasticsearch network.host: 0.0.0.0 http.port: 9200 transport.host: localhost transport.tcp.port: 9300 gateway.expected_nodes: 1 ``` Log File... ``` [2017-03-01T17:05:09,618][INFO][o.e.p.PluginsService] [opselk-197323431-1-198091806.Elkprod.apps-ops.com] no plugins loaded [2017-03-01T17:05:11,358][INFO][o.e.n.Node] [opselk-197323431-1-198091806.Elkprod.apps-ops.com] initialized [2017-03-01T17:05:11,358][INFO][o.e.n.Node] [opselk-197323431-1-198091806.Elkprod.apps-ops.com] starting ... [2017-03-01T17:05:11,442][WARN][i.n.u.i.MacAddressUtil] Failed to find a usable hardware address from the network interfaces; using random bytes: bd:e2:6b:bb:af:90:b9:e9 [2017-03-01T17:05:11,497][INFO][o.e.t.TransportService] [opselk-197323431-1-198091806.Elkprod.apps-ops.com] publish_address {10.1.1.10:9300}, bound_addresses {0.0.0.0:9300} [2017-03-01T17:05:11,501][INFO][o.e.b.BootstrapChecks] [opselk-197323431-1-198091806.Elkprod.apps-ops.com] bound or publishing to a non-loopback or non-link-local address, enforcing bootstrap checks [2017-03-01T17:05:11,503][ERROR][o.e.b.Bootstrap] [opselk-197323431-1-198091806.Elkprod.apps-ops.com] node validation exception bootstrap checks failed max file descriptors [64000] for elasticsearch process is too low, increase to at least [65536] system call filters failed to install; check the logs and fix your configuration or disable system call filters at your own risk [2017-03-01T17:05:11,505][INFO][o.e.n.Node] [opselk-197323431-1-198091806.Elkprod.apps-ops.com] stopping ... [2017-03-01T17:05:11,583][INFO][o.e.n.Node] [opselk-197323431-1-198091806.Elkprod.apps-ops.com] stopped [2017-03-01T17:05:11,584][INFO][o.e.n.Node] [opselk-197323431-1-198091806.Elkprod.apps-ops.com] closing ... [2017-03-01T17:05:11,604][INFO][o.e.n.Node] [opselk-197323431-1-198091806.Elkprod.apps-ops.com] closed ``` ---
**Author:** ![dadoonet](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/dadoonet/32/137187_2.png) [@dadoonet](https://discuss.elastic.co/u/dadoonet)\ **Post date:** [March 1, 2017, 8:58pm UTC](https://discuss.elastic.co/t/elasticsearch-5-2-0-unable-to-form-cluster/77031/2 "2017-03-01T20:58:42Z")
- max file descriptors: [https://www.elastic.co/guide/en/elasticsearch/reference/current/\_file\_descriptor\_check.html](https://www.elastic.co/guide/en/elasticsearch/reference/current/_file_descriptor_check.html) - system call filters: [https://www.elastic.co/guide/en/elasticsearch/reference/current/system-call-filter-check.html](https://www.elastic.co/guide/en/elasticsearch/reference/current/system-call-filter-check.html) ---
**Author:** ![Neuron\_Ring](https://avatars.discourse-cdn.com/v4/letter/n/6a8cbe/32.png) [@Neuron\_Ring](https://discuss.elastic.co/u/Neuron_Ring)\ **Post date:** [March 1, 2017, 10:01pm UTC](https://discuss.elastic.co/t/elasticsearch-5-2-0-unable-to-form-cluster/77031/3 "2017-03-01T22:01:04Z")
@dadoonet 1. I have fixed the file descriptor problem 2. The Linux kernel i am using does not have SecComp. So i have disabled system call filter checks. `bootstrap.system_call_filter` So, both the problems are fixed now. Now i am able to start my node without any bootstrap check errors. But still the cluster mode is not working as expected. This is my config file now.. ``` cluster.name: elasticsearch cluster.routing.allocation.awareness.force.cloud.values: zone node.name: elknode-1 node.master: true node.data: true node.max_local_storage_nodes: 1 path.conf: /usr/local/etc/elasticsearch path.data: /data/elasticsearch path.logs: /usr/local/var/log/elasticsearch bootstrap.system_call_filter: false http.host: 10.1.1.10 http.port: 9200 gateway.expected_nodes: 1 bootstrap.memory_lock: true discovery.zen.minimum_master_nodes: 2 discovery.zen.ping.unicast.hosts: ["10.1.1.10","10.1.1.11"] ``` Getting the below in the log file.. Doesnt seem to working in a master-client cluster > [2017-03-01T21:53:21,060][INFO][o.e.n.Node] [[opselk-197323431-1-198091806.Elkprod.apps-ops.boitop.com](http://opselk-197323431-1-198091806.Elkprod.apps-ops.boitop.com)] initializing ... > [2017-03-01T21:53:21,143][INFO][o.e.e.NodeEnvironment] [[opselk-197323431-1-198091806.Elkprod.apps-ops.boitop.com](http://opselk-197323431-1-198091806.Elkprod.apps-ops.boitop.com)] using [1] data paths, mounts [[/data (/dev/mapper/opselk-volume--197323431--1)]], net usable\_space [700.5gb], net total\_space [738.1gb], spins? [possibly], types [ext4] > [2017-03-01T21:53:21,144][INFO][o.e.e.NodeEnvironment] [[opselk-197323431-1-198091806.Elkprod.apps-ops.com](http://opselk-197323431-1-198091806.Elkprod.apps-ops.com)] heap size [11.4gb], compressed ordinary object pointers [true] > [2017-03-01T21:53:21,145][INFO][o.e.n.Node] [[opselk-197323431-1-198091806.Elkprod.apps-ops.com](http://opselk-197323431-1-198091806.Elkprod.apps-ops.com)] node name [[opselk-197323431-1-198091806.Elkprod.apps-ops.boitop.cdcprod5.prod.walmart.com](http://opselk-197323431-1-198091806.Elkprod.apps-ops.boitop.cdcprod5.prod.walmart.com)], node ID [IUd6bgP-TPmv8NFfwv1tcA] > [2017-03-01T21:53:21,146][INFO][o.e.n.Node] [[opselk-197323431-1-198091806.Elkprod.apps-ops.com](http://opselk-197323431-1-198091806.Elkprod.apps-ops.com)] version[5.2.0], pid[4538], build[24e05b9/2017-01-24T19:52:35.800Z], OS[Linux/2.6.32-642.el6.x86\_64/amd64], JVM[Oracle Corporation/Java HotSpot(TM) 64-Bit Server VM/1.8.0\_51/25.51-b03] > [2017-03-01T21:53:21,936][INFO][o.e.p.PluginsService] [[opselk-197323431-1-198091806.Elkprod.apps-ops.com](http://opselk-197323431-1-198091806.Elkprod.apps-ops.com)] loaded module [aggs-matrix-stats] > [2017-03-01T21:53:21,936][INFO][o.e.p.PluginsService] [[opselk-197323431-1-198091806.Elkprod.apps-ops.com](http://opselk-197323431-1-198091806.Elkprod.apps-ops.com)] loaded module [ingest-common] > [2017-03-01T21:53:21,936][INFO][o.e.p.PluginsService] [[opselk-197323431-1-198091806.Elkprod.apps-ops.com](http://opselk-197323431-1-198091806.Elkprod.apps-ops.com)] loaded module [lang-expression] > [2017-03-01T21:53:21,936][INFO][o.e.p.PluginsService] [[opselk-197323431-1-198091806.Elkprod.apps-ops.com](http://opselk-197323431-1-198091806.Elkprod.apps-ops.com)] loaded module [lang-groovy] > [2017-03-01T21:53:21,936][INFO][o.e.p.PluginsService] [[opselk-197323431-1-198091806.Elkprod.apps-ops.com](http://opselk-197323431-1-198091806.Elkprod.apps-ops.com)] loaded module [lang-mustache] > [2017-03-01T21:53:21,936][INFO][o.e.p.PluginsService] [[opselk-197323431-1-198091806.Elkprod.apps-ops.com](http://opselk-197323431-1-198091806.Elkprod.apps-ops.com)] loaded module [lang-painless] > [2017-03-01T21:53:21,936][INFO][o.e.p.PluginsService] [[opselk-197323431-1-198091806.Elkprod.apps-ops.com](http://opselk-197323431-1-198091806.Elkprod.apps-ops.com)] loaded module [percolator] > [2017-03-01T21:53:21,936][INFO][o.e.p.PluginsService] [[opselk-197323431-1-198091806.Elkprod.apps-ops.com](http://opselk-197323431-1-198091806.Elkprod.apps-ops.com)] loaded module [reindex] > [2017-03-01T21:53:21,936][INFO][o.e.p.PluginsService] [[opselk-197323431-1-198091806.Elkprod.apps-ops.com](http://opselk-197323431-1-198091806.Elkprod.apps-ops.com)] loaded module [transport-netty3] > [2017-03-01T21:53:21,936][INFO][o.e.p.PluginsService] [[opselk-197323431-1-198091806.Elkprod.apps-ops.com](http://opselk-197323431-1-198091806.Elkprod.apps-ops.com)] loaded module [transport-netty4] > [2017-03-01T21:53:21,937][INFO][o.e.p.PluginsService] [[opselk-197323431-1-198091806.Elkprod.apps-ops.com](http://opselk-197323431-1-198091806.Elkprod.apps-ops.com)] no plugins loaded > [2017-03-01T21:53:23,854][INFO][o.e.n.Node] [[opselk-197323431-1-198091806.Elkprod.apps-ops.com](http://opselk-197323431-1-198091806.Elkprod.apps-ops.com)] initialized > [2017-03-01T21:53:23,854][INFO][o.e.n.Node] [[opselk-197323431-1-198091806.Elkprod.apps-ops.com](http://opselk-197323431-1-198091806.Elkprod.apps-ops.com)] starting ... > [2017-03-01T21:53:23,940][WARN][i.n.u.i.MacAddressUtil] Failed to find a usable hardware address from the network interfaces; using random bytes: 34:be:ba:27:d4:93:a9:27 > [2017-03-01T21:53:24,003][INFO][o.e.t.TransportService] [[opselk-197323431-1-198091806.Elkprod.apps-ops.boitop.com](http://opselk-197323431-1-198091806.Elkprod.apps-ops.boitop.com)] publish\_address {127.0.0.1:9300}, bound\_addresses {127.0.0.1:9300} > [2017-03-01T21:53:54,047][WARN][o.e.n.Node] [[opselk-197323431-1-198091806.Elkprod.apps-ops.boitop.com](http://opselk-197323431-1-198091806.Elkprod.apps-ops.boitop.com)] timed out while waiting for initial discovery state - timeout: 30s > [2017-03-01T21:53:54,057][INFO][o.e.h.HttpServer] [[opselk-197323431-1-198091806.Elkprod.apps-ops.boitop.com](http://opselk-197323431-1-198091806.Elkprod.apps-ops.boitop.com)] publish\_address {10.1.1.10:9200}, bound\_addresses {10.1.1.10:9200} > [2017-03-01T21:53:54,058][INFO][o.e.n.Node] [[opselk-197323431-1-198091806.Elkprod.apps-ops.boitop.com](http://opselk-197323431-1-198091806.Elkprod.apps-ops.boitop.com)] started ---
**Author:** ![dadoonet](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/dadoonet/32/137187_2.png) [@dadoonet](https://discuss.elastic.co/u/dadoonet)\ **Post date:** [March 1, 2017, 10:35pm UTC](https://discuss.elastic.co/t/elasticsearch-5-2-0-unable-to-form-cluster/77031/4 "2017-03-01T22:35:27Z")
I'd probably change http.host by network.host ---
**Author:** ![Neuron\_Ring](https://avatars.discourse-cdn.com/v4/letter/n/6a8cbe/32.png) [@Neuron\_Ring](https://discuss.elastic.co/u/Neuron_Ring)\ **Post date:** [March 1, 2017, 10:52pm UTC](https://discuss.elastic.co/t/elasticsearch-5-2-0-unable-to-form-cluster/77031/5 "2017-03-01T22:52:05Z")
@dadoonet changing it to http.host to network.host worked !!! Thank You very much ! Is it a good idea to have both the nodes in the cluster as MASTER nodes? ---
**Author:** ![warkolm](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/warkolm/32/39224_2.png) [@warkolm](https://discuss.elastic.co/u/warkolm)\ **Post date:** [March 1, 2017, 11:19pm UTC](https://discuss.elastic.co/t/elasticsearch-5-2-0-unable-to-form-cluster/77031/6 "2017-03-01T23:19:46Z")
Ideally you should have 3 nodes, see [https://www.elastic.co/guide/en/elasticsearch/guide/2.x/important-configuration-changes.html#\_minimum\_master\_nodes](https://www.elastic.co/guide/en/elasticsearch/guide/2.x/important-configuration-changes.html#_minimum_master_nodes) ---
**Author:** ![Neuron\_Ring](https://avatars.discourse-cdn.com/v4/letter/n/6a8cbe/32.png) [@Neuron\_Ring](https://discuss.elastic.co/u/Neuron_Ring)\ **Post date:** [March 1, 2017, 11:32pm UTC](https://discuss.elastic.co/t/elasticsearch-5-2-0-unable-to-form-cluster/77031/7 "2017-03-01T23:32:04Z")
Can you please help me to understand this better ? When you say minimum three nodes ? 2 master and 1 client node ? What is the downside if i have only 2 nodes in a cluster and both the nodes act master ? What is the problem if i dont have the third node. > If you have two regular nodes, you are in a conundrum. A quorum would be 2, but this means a loss of one node will make your cluster inoperable. A setting of 1 will allow your cluster to function, but doesn’t protect against split brain. It is best to have a minimum of three nodes in situations like this. ---
**Author:** ![warkolm](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/warkolm/32/39224_2.png) [@warkolm](https://discuss.elastic.co/u/warkolm)\ **Post date:** [March 2, 2017, 1:23am UTC](https://discuss.elastic.co/t/elasticsearch-5-2-0-unable-to-form-cluster/77031/8 "2017-03-02T01:23:07Z")
> [@Neuron\_Ring](#): > > If you have two regular nodes, you are in a conundrum. A quorum would be 2, but this means a loss of one node will make your cluster inoperable. A setting of 1 will allow your cluster to function, but doesn’t protect against split brain. It is best to have a minimum of three nodes in situations like this. That's exactly what will happen. ---
**Author:** ![Neuron\_Ring](https://avatars.discourse-cdn.com/v4/letter/n/6a8cbe/32.png) [@Neuron\_Ring](https://discuss.elastic.co/u/Neuron_Ring)\ **Post date:** [March 2, 2017, 4:08pm UTC](https://discuss.elastic.co/t/elasticsearch-5-2-0-unable-to-form-cluster/77031/9 "2017-03-02T16:08:14Z")
Ok. Thank You. ! ---
**Author:** ![system](https://us1.discourse-cdn.com/elastic/original/3X/1/a/1ac57faf039f6b580b3f104ef42a2a89e41014de.png) [@system](https://discuss.elastic.co/u/system)\ **Post date:** [March 30, 2017, 4:08pm UTC](https://discuss.elastic.co/t/elasticsearch-5-2-0-unable-to-form-cluster/77031/10 "2017-03-30T16:08:24Z")
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