cloud/Public_cloud/loadbalancer-init.py

from hcloud import Client
from hcloud.images.domain import Image
from hcloud.server_types.domain import ServerType
from hcloud.networks.domain import NetworkSubnet
from hcloud.locations.domain import Location
from hcloud.load_balancer_types.domain import LoadBalancerType
from hcloud.load_balancers.domain import LoadBalancerTarget, LoadBalancerService, LoadBalancerHealthCheck, LoadBalancerHealtCheckHttp
from pathlib import Path

with open("../token.txt", "r") as file:
    api_token = file.read().strip()

with open(f'{str(Path.home())}/.ssh/id_ed25519.pub', 'r') as file:
    ssh_key = file.readline()

client = Client(token=api_token)

PREFIX = "s444498"

try:
    ssh_key = client.ssh_keys.create(name=f"{PREFIX}-pzc-ssh-key-2", public_key=ssh_key)
    print(f"Key {ssh_key.data_model.name} created: {ssh_key.data_model.public_key}")
except:
    ssh_key = client.ssh_keys.get_by_name(f"{PREFIX}-pzc-ssh-key-2")
    print(f"Key {ssh_key.data_model.name} already in use: {ssh_key.data_model.public_key}")

NUM_OF_SERVERS = 5
loadbalancer_targets = []

try:
    vnet = client.networks.create(
        name=f"{PREFIX}-pzc-test-vnet", 
        ip_range="10.10.10.0/24", 
        subnets=[
            NetworkSubnet(ip_range="10.10.10.0/24", network_zone="eu-central", type="cloud")
        ]
    )
    print(f"Created network: {vnet.data_model.name} ({vnet.data_model.ip_range})")
except:
    vnet = client.networks.get_by_name(
        f"{PREFIX}-pzc-test-vnet", 
    )
    print(f"Network in use: {vnet.data_model.name} ({vnet.data_model.ip_range})")

webservice_init=r'''
#cloud-config
runcmd:
  - git clone https://git.wmi.amu.edu.pl/s444498/cloud
  - cd Public_cloud
  - chmod +x webservice
  - ./webservice
'''
for i in range(NUM_OF_SERVERS):
    webservice_server = client.servers.create(
        name=f"{PREFIX}-webservice-{i+1}",
        server_type=ServerType("cx11"),
        image=Image(name="ubuntu-22.04"),
        ssh_keys=[ssh_key],
        networks=[vnet],
        location=Location("hel1"),
        user_data=webservice_init
    )

    webservice_server.action.wait_until_finished()
    print(f"Creating webservice {i+1}: {webservice_server.action.complete}")
    loadbalancer_targets.append(LoadBalancerTarget(type="server", server=webservice_server.server, use_private_ip=True))

try:
    loadbalancer = client.load_balancers.create(
        name= f"{PREFIX}-loadbalancer",
        load_balancer_type=LoadBalancerType(name="lb11"),
        location=Location("hel1"),
        services=[
            LoadBalancerService(
                protocol="http",
                listen_port=8080,
                destination_port=8080,
                proxyprotocol=False,
                health_check=LoadBalancerHealthCheck(
                    protocol="http",
                    port="8080",
                    interval=15,
                    timeout=10,
                    retries=3,
                    http=LoadBalancerHealtCheckHttp(
                        path="/factors/32",
                        status_codes=["2??", "3??"],
                        tls=False
                    )
                ),
            )
        ],
        targets=loadbalancer_targets,
        public_interface=True,
        network=vnet
    )
except:
    loadbalancer = client.load_balancers.get_by_name(f"{PREFIX}-loadbalancer")

loadbalancer.action.wait_until_finished()
print(f"Loadbalancer creating...: {loadbalancer.action.complete}")

load_balancer = client.load_balancers.get_by_name(f"{PREFIX}-loadbalancer")
print(f"Webserwis: http://{load_balancer.data_model.public_net.ipv4.ip}:8080/factors/")