I have 3 nodes of Elasticsearch in my cluster. how they connect to each other and how to set output filter of my logstash to send data to ES cluster(actually which node is responsible for gathering data)?
actually Logstash send data to cluster and you can check it from /etc/logstash/conf.d/*. ingest node is responsible for indexing documents on cluster. by default all nodes are ingest. you can have dedicated ingest node but with 3 nodes you don't need.
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I have 3 nodes elasticsearch cluster. If more than one node goes down then I can easily check them manually. Suppose nodes in the cluster got increased then it will be difficult to check them manually. So, how can I get all the nodes(specifically name of the nodes) of the cluster even if they are down?
To get live/healthy nodes I hit the api endpoint:
curl -X GET "hostname/ip:port/_cat/nodes?v&pretty"
Is there any endpoint by using which I can get total nodes and unhealthy/down nodes in elasticsearch cluster?
I was trying to list all the nodes using discovery.seed.hosts present in elasticsearch.yml config file. But I don't know how to do it or is it the right approach or not.
I don't think there is any API to know about offline nodes. If your entire cluster is down or single node down, then Elastic doesn't provide any way to check the node's health. You need to depend on an external script or code or monitoring tool which will ping all your nodes and print status.
You can write a custom script which will call below API and it will return all the nodes which are available in the cluster. Once you have received response, you can filter out IP or hostname of the node and whichever are not coming in response you can consider it as down node.
GET _cat/nodes?format=json&filter_path=ip,name
Another option is to enable cluster monitoring which will give you status of entire cluster but again it will show information about running node only.
Please check this answer for how Kibana show offline node in Cluster Monitoring.
I have multiple nodes in my elasticsearch cluster. How can I route traffic to the multiple nodes in my metricbeat configuration file?
In the Elasticsearch Output in your metricbeat configuration file, you can give multiple node output in an array format like this,
hosts: ["https://IP_Node_01:9200","https://IP_Node_02:9200","https://IP_Node_03:9200"]
This gives failover capability, where beats can connect to other nodes in case of failed nodes.
We have a cluster running with 6 nodes. Now when I add a Kafka consumer, each cluster node should pull unique data, as in each node should fetch from a diff partition: https://bryanbende.com/development/2016/09/15/apache-nifi-and-apache-kafka.
The same is also mentioned in the nifi docs. However in our case each node is pulling the same data from Kafka leading to duplication. Can someone please help. Are there any specific configurations required to get the same done?
I am new in handling elasticsearch cluster .
My question is where to put indices. settings.
In
Data nodes
Both master and data
All the nodes
For eg
indices.memory.index_buffer_size : 20%
On which all nodes i need to add this setting?
Currently I have existing
1. Elastic search
2. Logstash
3. Kibana
I have existing data on them.
Now i have setup ELK cluster with 3 Master nodes , 5 data nodes 3 client nodes.
But i am not sure how can i get existing data into them.
Is it possible that if i make the existing ES node as data node and then attach it to the cluster . Then will that data gets replicated to other data nodes as well? and then take that node offline
Option 1
How about just try with fewer nodes? It is not hard to test if it is supported if you setup one node, feed some data, and add one more and configure them as a cluster to see if data get synchronized.
Option 2
Another option is to use an elasticsearch migration tool like https://github.com/taskrabbit/elasticsearch-dump, basically, you could setup a clean cluster and migrate all your data in old node to this cluster.