node-mysql pool experiences ETIMEDOUT

Question

I have a node-mysql pool configuration of

var db_init={
            host     : \'ip_address_of_GCS_SQL\',
            user     : \'user_name_of_GCS_SQL\',
               


        

Answer 1

I suspect the reason is that keepalive is not enabled on the connection to the MySQL server.

node-mysql does not have an option to enable keepalive and neither does node-mysql2, but node-mysql2 provides a way to supply a custom function for creating sockets which we can use to enable keepalive:

var mysql = require('mysql2');
var net = require('net');

var pool  = mysql.createPool({
  connectionLimit : 100,
  host            : '123.123.123.123',
  user            : 'foo',
  password        : 'bar',
  database        : 'baz',
  stream          : function(opts) {
    var socket = net.connect(opts.config.port, opts.config.host);
    socket.setKeepAlive(true);
    return socket;
  }
});