Prints out how how many primary and secondary shards on each node in an Elasticsearch Cluster.

elasticsearch-node-shard-counter.rb

#!/usr/bin/env ruby

require "json"

state = JSON.parse `curl localhost:9200/_cluster/state`

dets = {}
state["nodes"].each do |name, details|
  dets[name] = { "name" => details["name"], "address" => details["transport_address"] }
end

nodes = {}
state["routing_nodes"]["nodes"].each do |node,shards|
  nodes[node] = {"primary" => 0, "replica" => 0 }
    shards.each do |shard|
    if shard["primary"]
      nodes[node]["primary"] += 1
    else
      nodes[node]["replica"] += 1
    end
  end
end

nodes.each do |name, status|
  puts "#{name} (#{dets[name]["name"]} - #{dets[name]["address"].gsub(/[^\d\.]/,'').sub(/930\d/,'')}):"
  puts "\tPrimary Shards: #{status["primary"]}"
  puts "\tReplica Shards: #{status["replica"]}"
end