libcloud/example_loadbalancer.py at 0.13.1 · apache/libcloud

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#!/usr/bin/env python

# Licensed to the Apache Software Foundation (ASF) under one or more

# contributor license agreements. See the NOTICE file distributed with

# this work for additional information regarding copyright ownership.

# The ASF licenses this file to You under the Apache License, Version 2.0

# (the "License"); you may not use this file except in compliance with

# the License. You may obtain a copy of the License at

# http://www.apache.org/licenses/LICENSE-2.0

# Unless required by applicable law or agreed to in writing, software

# distributed under the License is distributed on an "AS IS" BASIS,

# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.

# See the License for the specific language governing permissions and

# limitations under the License.

import os

import time

from libcloud.loadbalancer.base import Member, Algorithm

from libcloud.loadbalancer.types import Provider, State

from libcloud.loadbalancer.providers import get_driver

def main():

Rackspace = get_driver(Provider.RACKSPACE_US)

driver = Rackspace('username', 'api key')

balancers = driver.list_balancers()

print(balancers)

# creating a balancer which balances traffic across two

# nodes: 192.168.86.1:80 and 192.168.86.2:8080. Balancer

# itself listens on port 80/tcp

new_balancer_name = 'testlb' + os.urandom(4).encode('hex')

members = (Member(None, '192.168.86.1', 80),

Member(None, '192.168.86.2', 8080))

new_balancer = driver.create_balancer(name=new_balancer_name,

algorithm=Algorithm.ROUND_ROBIN,

port=80,

protocol='http',

members=members)

print(new_balancer)

# wait for balancer to become ready

# NOTE: in real life code add timeout to not end up in

# endless loop when things go wrong on provider side

while True:

balancer = driver.get_balancer(balancer_id=new_balancer.id)

if balancer.state == State.RUNNING:

break

print('sleeping for 30 seconds for balancers to become ready')

time.sleep(30)

# fetch list of members

members = balancer.list_members()

print(members)

# remove first member

balancer.detach_member(members[0])

# remove the balancer

driver.destroy_balancer(new_balancer)

if __name__ == "__main__":

main()

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