If you need to find the first available http proxy and use it for a process,
you can use a python snippet to discover it and use it.
https://gitlab.com/bgstack15/former-
gists/tree/master/get_first_open_port.py
vars:
http_proxies:
- 192.168.1.5:3128
- proxy5.internal.example.com:3128
tasks:
- name: learn which proxy to use
script: get_first_open_port.py {{ http_proxies | join( " " ) }}
changed_when: false
register: open_ports
- set_fact:
http_proxy: "{{ open_ports.stdout_lines[0] }}"
when:
- 'open_ports.stdout | length > 0'
failed_when:
- 'open_ports.stdout | length = 0'
- name: use http_proxy environment variable
script: script_needing_internet.sh -i {{ inputvar }}
environment:
http_proxy: "http://{{ http_proxy | default(omit) }}"
The sole output is the first hostname and port available.
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#!/usr/bin/python2
# Filename: get_first_open_port.py
# Location: /etc/ansible/roles/install_sccm/files/
# Author: bgstack15
# Startdate: 2018-10-02 10:13
# Title: Script that Gets the First Open Port
# Purpose: Return to standard output the first valid host and port to use as a http proxy
# Project: projects derived from ansible role certreq
# History:
# Usage:
# in ansible
# Reference:
# https://stackoverflow.com/questions/19196105/python-how-to-check-if-a-network-port-is-open-on-linux
# string split https://stackoverflow.com/questions/6670290/split-string-into-different-variables-instead-of-array-in-python
# Improve:
# Documentation:
import socket, sys
from contextlib import closing
GFOP_VERSION="2018-10-02a"
def check_socket(host, port):
with closing(socket.socket(socket.AF_INET, socket.SOCK_STREAM)) as sock:
sock.settimeout(2)
if sock.connect_ex((host,port)) == 0:
print host + ":" + str(port)
return True
return False
x = 0
for myarg in sys.argv:
# show version
if myarg == "--version" or myarg == "-V":
print(sys.argv[0]+" "+GFOP_VERSION)
sys.exit(0)
x = x + 1
# skip the script $0 name itself
if x > 1:
# split on the colon
host, port = myarg.split(":",2)
# short-circuit upon first successful one
if check_socket(host,int(port)):
sys.exit(0)
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