CODEWITHSUNDEEP
node.js
Xeos
Xeos

Reputation: 6487

Node.js listen() throws 'EADDRINUSE' after server.close()

I am trying to terminate cluster workers when they are not needed to free up some resources. Here is the code I use in worker:

server.on("close", function() {
    process.exit();
});
server.close();

This code is executed when the worker gets the command from master. The "close" callback IS called, but I can't access any ports that the workers were using. So I have this code

var server = require('http').createServer(function(req, res) {
    res.writeHead(200);
    res.end('');
});
server.listen(8080);

And if I restart the worker after it exits, I get 'EADDRINUSE' for the listen() on 8080 port.

Upvotes: 0

Views: 877

Answers (2)

Xeos
Xeos

Reputation: 6487

It turns out Socket.io (what is getting listening on the port) is not releasing the port until it is terminated. It is done in order to allow port-reuse. I was able to re-create a socket.io instance using the exactly same port as was used before. So if I use port 8080 for socket.io connection to shopping cart and port 8081 for socket responsible for the recommendations, I would have to call listen(8080) the next time I create the shopping cart socket instance.

I wanted to use different ports for different connections at different times. I was trying to announce the connections as they were available, but I guess I will have to hardcode the ports for different services now. At least the EADDRINUSE does not show up any more.

Upvotes: 0

pawatify
pawatify

Reputation: 51

Please run this script to kill node related process. and run your code again

(function(){
   "use strict";  
    var exec    = require('child_process').exec,
    lCmd    = 'kill -9'             +   ' ' + /* kill finded process */
              '`ps ax'              +   '|' + /* show all process    */
              'grep node-openshift' +   '|' + /* find node-openshift */
              'grep -v grep'        +   '|' + /* exlude grep command */
              'awk "{print $1}"`';            /* show first collumn  */

     exec(lCmd, function(error, stdout, stderr){
    console.log(error || stdout || stderr);
 }); 
})();

Upvotes: 1

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