On macOS Big Sur
and later, use this command:
sudo lsof -i -P | grep LISTEN
or to just see just IPv4:
sudo lsof -nP -i4TCP:$PORT | grep LISTEN
On older versions, use one of the following forms:
sudo lsof -nP -iTCP:$PORT | grep LISTEN
sudo lsof -nP -i:$PORT | grep LISTEN
Substitute $PORT
with the port number or a comma-separated list of port numbers.
Prepend sudo
(followed by a space) if you need information on ports below #1024.
The -n
flag is for displaying IP addresses instead of host names. This makes the command execute much faster, because DNS lookups to get the host names can be slow (several seconds or a minute for many hosts).
The -P
flag is for displaying raw port numbers instead of resolved names like http
, ftp
or more esoteric service names like dpserve
, socalia
.
See the comments for more options.
For completeness, because frequently used together:
To kill the PID:
sudo kill -9 <PID>
# kill -9 60401
Nginx works as a front end server, which in this case proxies the requests to a node.js server. Therefore you need to setup an nginx config file for node.
This is what I have done in my Ubuntu box:
Create the file yourdomain.com
at /etc/nginx/sites-available/
:
vim /etc/nginx/sites-available/yourdomain.com
In it you should have something like:
# the IP(s) on which your node server is running. I chose port 3000.
upstream app_yourdomain {
server 127.0.0.1:3000;
keepalive 8;
}
# the nginx server instance
server {
listen 80;
listen [::]:80;
server_name yourdomain.com www.yourdomain.com;
access_log /var/log/nginx/yourdomain.com.log;
# pass the request to the node.js server with the correct headers
# and much more can be added, see nginx config options
location / {
proxy_set_header X-Real-IP $remote_addr;
proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
proxy_set_header Host $http_host;
proxy_set_header X-NginX-Proxy true;
proxy_pass http://app_yourdomain/;
proxy_redirect off;
}
}
If you want nginx (>= 1.3.13) to handle websocket requests as well, add the following lines in the location /
section:
proxy_http_version 1.1;
proxy_set_header Upgrade $http_upgrade;
proxy_set_header Connection "upgrade";
Once you have this setup you must enable the site defined in the config file above:
cd /etc/nginx/sites-enabled/
ln -s /etc/nginx/sites-available/yourdomain.com yourdomain.com
Create your node server app at /var/www/yourdomain/app.js
and run it at localhost:3000
var http = require('http');
http.createServer(function (req, res) {
res.writeHead(200, {'Content-Type': 'text/plain'});
res.end('Hello World\n');
}).listen(3000, "127.0.0.1");
console.log('Server running at http://127.0.0.1:3000/');
Test for syntax mistakes:
nginx -t
Restart nginx:
sudo /etc/init.d/nginx restart
Lastly start the node server:
cd /var/www/yourdomain/ && node app.js
Now you should see "Hello World" at yourdomain.com
One last note with regards to starting the node server: you should use some kind of monitoring system for the node daemon. There is an awesome tutorial on node with upstart and monit.
Best Answer
This is now possible with the addition of the ngx_stream_ssl_preread module added in Nginx 1.11.5 and the ngx_stream_map module added in 1.11.2.
This allows Nginx to read the TLS Client Hello and decide based on the SNI extension which backend to use.