Enable/Disable HAproxy Backend Servers via Python

Sometimes we may want to automatically enable/disable machines behind our HAproxy automatically (during a deploy or maintenance), this is how it's done via Python code. The idea is to use HAproxy Unix Socket based API.

	import socket
	import os
	def haproxy_ctrl(command, socket_path, backend, machine):
	command_str = ''
	if os.path.exists(socket_path):
	client = socket.socket( socket.AF_UNIX, socket.SOCK_STREAM )
	print socket_path
	client.connect(socket_path)
	command_str+=command+' server '+backend+'/'+machine+"\n"
	try:
	print '[debug] executing =>',command_str
	client.send(command_str)
	except Exception, e:
	print str(e)
	client.close()
	#invoke
	command = 'disable'
	ha_socket = '/var/lib/run/haproxystat'
	backend = 'tomcats'
	machine = 'tomcat01.domain.local'
	haproxy_ctrl (command, ha_socket, backend, machine)

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