Nginx as a keep-alive proxy for elasticsearch.

nginx_elasticsearch_proxy_keepalive_test.sh

# Install:
#
# brew update
# brew install elasticsearch
# brew install nginx

elasticsearch -D es.http.port='9200' -D es.cluster.name='elasticsearch_proxy_test' -D es.node.name='test-nginx-1'
#elasticsearch -D es.http.port='9201' -D es.cluster.name='elasticsearch_proxy_test' -D es.node.name='test-nginx-2'

echo '
events {
    worker_connections  1024;
}

http {

  upstream elasticsearch {
      server 127.0.0.1:9200;
      #server 127.0.0.1:9201;

      keepalive 15;
  }

  server {
      listen 8080;
      server_name elasticsearch_proxy;

      error_log   elasticsearch_proxy-errors.log;
      access_log  elasticsearch_proxy.log;

      location / {
          proxy_pass http://elasticsearch;
          proxy_http_version 1.1;
          proxy_set_header Connection "Keep-Alive";
          proxy_set_header Proxy-Connection "Keep-Alive";
      }

  }

}
' > ./nginx_elasticsearch_proxy.conf

nginx -p '/Users/karmi/Playground/ElasticSearch/Varia/' -c 'nginx_elasticsearch_proxy.conf'


# Connection to ES directly
#
curl 'localhost:9200/_cluster/nodes/stats?pretty&clear&http'
#
# => Check `http.total_opened`, increasing by 1

# Connection to nginx
#
curl 'localhost:8080/_cluster/nodes/stats?pretty&clear&http'
#
# Check `http.total_opened`, should stay put

# Multiple sequential connections
#
for i in {1..100}; do curl 'localhost:8080/_cluster/nodes/stats?pretty&clear&http'; done

# Multiple simultaneous connections
#
for i in {1..100}; do bash -c "(curl 'localhost:8080/_cluster/nodes/stats?pretty&clear&http') &"; done