node.js - nodejs cluster中server是由谁创建的

Question

简要代码如下：
if(cluster.isMaster){

   cluster.fork();
   cluster.fork();

}else{

http.createServer(function(){
    ...
}).bind(8080);

}
想问一下，为什么server的创建要写在else里面？那意思不就是 在子进程中创建server，运行了两次，就是创建了2个server？而且都是绑定的同样的端口号？求指点。

Answer 1

This is how I understand it:
When the file starts to be executed
cluster.isMaster is true
Then enter the true branch to fork
Create a new thread for each fork. This thread will execute the file from the beginning
At this time cluster.isMaster is false
Enter false branch
Execute to create the server
As for why the same port is listened to
In fact, only the main thread listens to this port
cluster The main thread will implement the distributor
distribute the request to other threads on this port

Answer 2

Created and listened to the port by the master process. When the request reaches the server master process, it accepts it and distributes it to the worker process