Can Bamboo give a free port number to use in a build variable?

I just want to ask Bamboo for a port number that is free of use (on the box the agent is running) that I can pass to my build. It seems that having that port available in a variable would be useful.

2 answers

You could use netstat to show you what is in use. The port range you want to utilize is upto to you and there are some standards depending on what you're trying to use it for.

If you use a scripting language like Python for building you get bind on port 0 on the remote agent. Binding on that port allows the os to tell which port is available for use.

def GetFreePort():
	"""Returns an available port"""
	sock = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
	sock.bind((socket.gethostbyname(socket.gethostname()), 0))
	return sock.getsockname()[1]

Yep I've done similar things in Java in the past as well. What I'm looking for though is a way for Bamboo to do that and make that available to my build in a variable. This way I can integrate various tools in my build easily.

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