HowTO Elasticsearch

API Rest

Get node cluster info

  curl http://${NODE_NAME}:9200/

Get nodes

  curl http://${NODE_NAME}:9200/_nodes

Allocate shards to an node

curl -XPOST -d '{ "commands" : [ {
  "allocate" : {
       "index" : "${INDEX_NAME}", 
       "shard" : ${SHARD_ID}, 
       "node" : "${NODE_NAME}-${CLUSTER_NAME}",
       "allow_primary":true 
     } 
  } ] }' http://${NODE_NAME}:9200/_cluster/reroute?pretty

Change/Where: - NODE_NAME - CLUSTER_NAME - SHARD_ID - INDEX_NAME

• Refs and credits:
• https://www.elastic.co/guide/en/elasticsearch/reference/current/disk-allocator.html
• https://www.datadoghq.com/blog/elasticsearch-unassigned-shards/

Remove nodes from an Cluster "gracefully"

curl -XPUT ONE_ES_NODE:9200/_cluster/settings -d '{
  "transient" :{
    "cluster.routing.allocation.exclude._ip" : "ES_NODE_IP_TO_REMOVE"
  }
}';echo

• Refs and credits:
• https://logz.io/blog/elasticsearch-cheat-sheet/

settings.index.routing.allocation.disable_allocation - Get all

ES_FQDN=myServer.com
for I in $(curl -s "http://$ES_FQDN:9200/_all/_settings" |jq 'keys[]'); 
do 
  I=$(echo $I |tr -d '"')
  echo $I/disable_allocation=$(curl  -s "http://$ES_FQDN:9200/$I/_settings/index.routing.allocation.disable_allocation" |jq .$I.settings.index.routing.allocation.disable_allocation)
done

settings.index.routing.allocation.disable_allocation - Change all to false

TODO

PLUGINS

Install kopf

TODO