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Have a consistent naming scheme

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Christoph Jürgen König
2025-04-16 10:22:38 +02:00
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"""Example for Cloud Computing Course Master AI / GSD"""
# This script demonstrates how to use libcloud to start an instance in an OpenStack environment.
# The script will start an instance, list all instances, and then destroy the instance again.
#
# The script uses the libcloud library to interact with the OpenStack API.
# Need to install libcloud first: pip install apache-libcloud
#
# libCloud: https://libcloud.apache.org/
# libCloud API documentation: https://libcloud.readthedocs.io/en/latest/
# OpenStack API documentation: https://developer.openstack.org/
#
# this code was initially based on the former tutorial:
# https://developer.openstack.org/firstapp-libcloud/
# Only needed when using a password prompt:
# import getpass
from libcloud.compute.providers import get_driver
from libcloud.compute.types import Provider
# For our new Charmed OpenStack private cloud, we need to specify the path to the
# root CA certificate for now, until we have a valid certificate for the OpenStack API.
# This is necessary to avoid SSL certificate verification errors.
import libcloud.security
libcloud.security.CA_CERTS_PATH = ['./root-ca.crt']
# Disable SSL certificate verification (not recommended for production)
#libcloud.security.VERIFY_SSL_CERT = False
# Please use 1-29 for 0 in the following variable to specify your group number.
# (will be used for the username, project etc., as coordinated in the lab sessions)
GROUP_NUMBER = 0
###############################################################################################
#
# no changes necessary below this line in this example
#
###############################################################################################
# web service endpoint of the private cloud infrastructure
#AUTH_URL = 'https://private-cloud.informatik.hs-fulda.de:5000'
# auth_url = 'https://private-cloud2.informatik.hs-fulda.de:5000'
# using the IP address of the OpenStack API endpoint to avoid DNS resolution issues for students
# using Linux or MacOS as our VPN currently does not support IPv6
AUTH_URL = "https://10.32.4.29:5000"
# your username in OpenStack
AUTH_USERNAME = 'CloudComp' + str(GROUP_NUMBER)
# your project in OpenStack
PROJECT_NAME = 'CloudComp' + str(GROUP_NUMBER)
# A network in the project the started instance will be attached to
PROJECT_NETWORK = 'CloudComp' + str(GROUP_NUMBER) + '-net'
# The image to look for and use for the started instance
# ubuntu_image_name = "Ubuntu 18.04 - Bionic Beaver - 64-bit - Cloud Based Image"
#UBUNTU_IMAGE_NAME = "auto-sync/ubuntu-jammy-22.04-amd64-server-20240319-disk1.img"
UBUNTU_IMAGE_NAME = "ubuntu-22.04-jammy-server-cloud-image-amd64"
# default region
REGION_NAME = 'RegionOne'
# domain to use, "default" for local accounts, formerly "hsfulda" for LDAP accounts etc.
# domain_name = "default"
def main(): # noqa: C901 pylint: disable=too-many-branches,too-many-statements,too-many-locals,missing-function-docstring
# get the password from user
# auth_password = getpass.getpass("Enter your OpenStack password:")
auth_password = "demo"
# instantiate a connection to the OpenStack private cloud
# make sure to include ex_force_auth_version='3.x_password', as needed in our environment
provider = get_driver(Provider.OPENSTACK)
print(f"Opening connection to {AUTH_URL} as {AUTH_USERNAME}...")
conn = provider(AUTH_USERNAME,
auth_password,
ex_force_auth_url=AUTH_URL,
ex_force_auth_version='3.x_password',
ex_tenant_name=PROJECT_NAME,
ex_force_service_region=REGION_NAME)
# ex_domain_name=domain_name)
print("Getting images and selecting desired one...")
print("=========================================================================")
# get a list of images offered in the cloud context (e.g. Ubuntu 20.04, cirros, ...)
images = conn.list_images()
image = ''
for img in images:
if img.name == UBUNTU_IMAGE_NAME:
image = img
print(img)
print("Getting flavors...")
print("=========================================================================")
# get a list of flavors offered in the cloud context (e.g. m1.small, m1.medium, ...)
flavors = conn.list_sizes()
for flavor in flavors:
print(flavor)
print("Selecting desired flavor...")
print("=========================================================================")
# get the flavor with id 2
flavor_id = '2'
flavor = conn.ex_get_size(flavor_id)
print(flavor)
print("Selecting desired network...")
print("=========================================================================")
# get a list of networks in the cloud context
networks = conn.ex_list_networks()
network = ''
for net in networks:
if net.name == PROJECT_NETWORK:
network = net
print("Create instance 'testing'...")
print("=========================================================================")
# create a new instance with the name "testing"
# make sure to provide networks (networks={network}) the instance should be attached to
instance_name = 'testing'
testing_instance = conn.create_node(name=instance_name, image=image, size=flavor,
networks={network})
print(testing_instance)
print("Showing all running instances...")
print("=========================================================================")
# show all instances (running nodes) in the cloud context
instances = conn.list_nodes()
for instance in instances:
print(instance)
print("Destroying instance...")
print("=========================================================================")
# destroy the instance we have just created
conn.destroy_node(testing_instance)
# method that is called when the script is started from the command line
if __name__ == '__main__':
main()