Docker – Bind for 0.0.0.0:4000 failed: port is already allocated
You need to make sure that the previous container you launched is killed, before launching a new one that uses the same port. docker container ls docker rm -f <container-name>
port
Can I map a hostname *and* a port with /etc/hosts? [closed]
No, that’s not possible. The port is not part of the hostname, so it has no meaning in the hosts-file.
How do I change the default port (9000) that Play uses when I execute the “run” command?
Play 2.x In Play 2, these are implemented with an sbt plugin, so the following instructions are really just sbt tasks. You can use any sbt runner (e In Play 2, these are implemented with an sbt plugin, so the following are really just sbt tasks. You can use any sbt runner (e.g. sbt, play, … Read more
How to find an available port?
If you don’t mind the port used, specify a port of 0 to the ServerSocket constructor and it will listen on any free port. ServerSocket s = new ServerSocket(0); System.out.println(“listening on port: ” + s.getLocalPort()); If you want to use a specific set of ports, then the easiest way is probably to iterate through them … Read more
ssh -L forward multiple ports
The -L option can be specified multiple times within the same command. Every time with different ports. I.e. ssh -L localPort0:ip:remotePort0 -L localPort1:ip:remotePort1 …
Forward host port to docker container
A simple but relatively insecure way would be to use the –net=host option to docker run. This option makes it so that the container uses the networking stack of the host. Then you can connect to services running on the host simply by using “localhost” as the hostname. This is easier to configure because you … Read more
What is process.env.PORT in Node.js?
In many environments (e.g. Heroku), and as a convention, you can set the environment variable PORT to tell your web server what port to listen on. So process.env.PORT || 3000 means: whatever is in the environment variable PORT, or 3000 if there’s nothing there. So you pass that to app.listen, or to app.set(‘port’, …), and … Read more
How to open a specific port such as 9090 in Google Compute Engine
Answer recommended by Google Cloud
Difference between targetPort and port in Kubernetes Service definition
Service: This directs the traffic to a pod. TargetPort: This is the actual port on which your application is running inside the container. Port: Some times your application inside container serves different services on a different port. Example: The actual application can run 8080 and health checks for this application can run on 8089 port … Read more
What is the difference between ports 465 and 587?
SMTP protocol: smtps (port 465) v. msa (port 587) Ports 465 and 587 are intended for email client to email server communication – sending out email using SMTP protocol. Port 465 is for smtps SSL encryption is started automatically before any SMTP level communication. Port 587 is for msa It is almost like standard SMTP … Read more