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Nomad configuration for single node to act as production server and client


By : Bibhu Panigrahi
Date : October 18 2020, 06:10 AM
help you fix your problem Production Nomad does not really "persist" data in the expected sense. It shares data within a cluster through a consensus protocol. Each server keeps its own copy of the "state of the world" and then "gossips" with its peers to notice any changes that it needs to make. If there is some measure of confusion or a tie-break is required, a "leader" provides the answer. This pattern creates redundancy and resiliency in the event that a server in the cluster goes down. Consul is designed to work in an almost identical fashion as well.
The "dev" mode is essentially a one-server cluster that is also a client. You really do not want to do this in production for a number of reasons. Mainly, the server cluster is designed to oversee and manage the resources and allocations on its associated clients. Colocating them in production on the same machine could create all kinds of problems as you increase the number and resource requirements of your jobs. The last thing you want is your job competing for resources with the process overseeing it.
code :


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node + socket.io: multiple server emits for single client emit?


By : Kameron Perkins
Date : March 29 2020, 07:55 AM
hop of those help? This is likely due to having your registration for connections inside of a route handler.
Each time a request comes in that is handled by that route, the code is adding a new listener for connections.
code :
function handler (request, response) {

  var uri = url.parse(request.url).pathname,    
  filename = path.join(process.cwd(), uri);      

  console.log(uri);

  path.exists(filename, function(exists) {  
    if(!exists) {
      response.writeHead(404, {"Content-Type": "text/plain"});
      response.write("404 Not Found\n");
      response.end();
      return;   //these returns get you out of the function I think
    }

    if (fs.statSync(filename).isDirectory()) filename += '/index.html';  

    fs.readFile(filename, "binary", function(err, file) {       
      if(err) {        
        response.writeHead(500, {"Content-Type": "text/plain"});
        response.write(err + "\n");
        response.end();
        return;
      }

      response.writeHead(200);
      response.write(file, "binary");  //otherwise here's where the file gets finally served
      response.end();
    }); //fs.readFile

  }); //path.exists
};

io.sockets.on('connection',function(socket) {
  socket.on('btn_api_call', function() {
    socket.emit('serverMessage', 'Server heard you.');
  });
});
var commentapp={
    init: function(){
        var commentapp=this;
        commentapp.btn_api=$('#btn_api'); 
        commentapp.btn_api.click(this.get_comment_data);        

        console.log('trying to connect');
        commentapp.socket=io.connect('http://localhost:8080');

        commentapp.socket.on('connect', function() {
            commentapp.socket.emit('btn_api_call');
        });  //commentapp.socket.on 'connect',

        commentapp.socket.on('serverMessage', function(content){
            console.log(content);
            }
        ); //commentapp.socket.on('serverMessage'
    },
    get_comment_data: function(btn_event){
        var commentapp=this;

        commentapp.socket.emit('btn_api_call');
    }

};

Aerospike heartbeat configuration for single server, error "Unable to find any suitable network device for node ID&


By : Azaharuddin
Date : March 29 2020, 07:55 AM
will be helpful for those in need The Node ID is generated using the MAC id of the interface on the host.
https://github.com/aerospike/aerospike-server/blob/master/cf/src/socket.c#L2470

database(mongoose) configuration for production in node


By : Gwenaël Yap
Date : March 29 2020, 07:55 AM
Does that help I recommend using node-config
as best practice, you will have to create a config folder with config files corresponding to your NODE_ENV
code :
module.exports = {
  // node port
  port: 3000
  // other default settings
};
module.exports = {
  // mongo url
  mongoUrl: "mongodb://localhost/db"
};
module.exports = {
  // mongo url
  mongoUrl: "mongodb://production.mongo.host/db"
};
module.exports = {
  // mongo url
  mongoUrl: "mongodb://staging.mongo.host/db"
};

Production grade Cassandra client configuration for Java application


By : Petric Smile
Date : March 29 2020, 07:55 AM
this will help The Java driver defaults are quite good, especially for that load. You need to use DCAware/TokenAware load balancing policy that is default. You may tune the connection pooling to allow more "in-flight" requests per single connection. You need to have only single instance of the Session class per application to avoid opening too many connections to cluster. The real performance gain comes from using the asynchronous operations, and having lower consistency level, like, LOCAL_ONE (but this is application specific).

How to setup a single node Consul server/client?


By : user3194565
Date : March 29 2020, 07:55 AM
this will help No "client" agent is required to run for an operational Consul cluster.
I had to set this server / master with the bootstrap_expect set to 1(number of nodes for boostrap process):
code :
{
  "retry_join" : ["127.0.0.1"],
  "data_dir": "/tmp2/consul",
  "log_level": "INFO",
  "server": true,
  "node_name": "master",
  "addresses": {
    "https": "127.0.0.1"
  },
  "bind_addr": "127.0.0.1",
  "ui": true,
  "bootstrap_expect": 1
}
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