FreePort
Get a free open TCP port that is ready to use.
Command Line Example:
# Ask the kernel to give us an open port.
export port=$(freeport)
# Start standalone httpd server for testing
httpd -X -c "Listen $port" &
# Curl local server on the selected port
curl localhost:$portGolang example:
package main
import "github.com/phayes/freeport"
func main() {
port, err := freeport.GetFreePort()
if err != nil {
log.Fatal(err)
}
// port is ready to listen on
}Installation
Mac OSX
brew install phayes/repo/freeportCentOS and other RPM based systems
wget https://github.com/phayes/freeport/releases/download/1.0.2/freeport_1.0.2_linux_386.rpm
rpm -Uvh freeport_1.0.2_linux_386.rpmUbuntu and other DEB based systems
wget wget https://github.com/phayes/freeport/releases/download/1.0.2/freeport_1.0.2_linux_amd64.deb
dpkg -i freeport_1.0.2_linux_amd64.debBuilding From Source
sudo apt-get install golang # Download go. Alternativly build from source: https://golang.org/doc/install/source
go get github.com/phayes/freeport