How to connect to elasticsearch using boost asio? - c++

Question

I'm trying to write a C++ snippet to make a POST to an elasticsearch server. The server is running on ip 172.20.1.160, and I can PUT data using curl, like in the Elasticsearch tutorial:
curl -XPUT 'localhost:9200/twitter/tweet/1?op_type=create&pretty' -H 'Content-Type: application/json' -d'
{
"user" : "kimchy",
"post_date" : "2009-11-15T14:12:12",
"message" : "trying out Elasticsearch"
}
'
But when I try to do something similar with boost ASIO, my connection is apparently refused.
Here's minimal compileable code showing how I try to create the connection, and which produces the error:
/// Compiled with:
/// g++ --std=c++14 foo.cpp -lboost_system -lpthread
#include <boost/asio.hpp>
constexpr const char *carbon_port = "2003";
constexpr const char *ES_port = "9200";
constexpr const char *server_ip = "172.20.1.160";
int main()
{
boost::asio::io_service io_service;
boost::asio::ip::tcp::resolver resolver(io_service);
boost::asio::ip::tcp::resolver::query query(server_ip, ES_port);
auto endpoint = *resolver.resolve(query);
boost::asio::ip::tcp::socket socket (io_service);
socket.connect(endpoint);
}
For what it's worth, I also have a carbon-graphite server running on the same machine, and I can connect and send data there via the plain-text protocol, but I am unable to make a socket connection to elasticsearch, I get the exception:
terminate called after throwing an instance of 'boost::exception_detail::clone_impl<boost::exception_detail::error_info_injector<boost::system::system_error> >'
what(): connect: Connection refused
Can someone enlighten me to what I need to know to get this working?

Answer 1

by default elasticsearch listens to localhost only , if you want it to listen to all ports , in config/elasticsearch.yml add the line network.host: 0.0.0.0 and restart elasticsearch.