DPZC-4-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, LoadBalancerServiceHttp, LoadBalancerHealthCheck, LoadBalancerHealtCheckHttp
from pathlib import Path

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

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

client = Client(token=api_token)

PREFIX = "s444354"

try:
    ssh_key = client.ssh_keys.create(name=f"{PREFIX}-pzc-ssh-key", 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")
    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}",
        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}",
    )
    print(f"Network in use: {vnet.data_model.name} ({vnet.data_model.ip_range})")

webservice_init=r'''#cloud-config
packages:
  - apt-transport-https
  - ca-certificates
  - curl
  - gnupg-agent
  - software-properties-common

write_files:
  - path: /root/Dockerfile
    content: |
        FROM ubuntu
        COPY ./webservice /
        RUN chmod +x ./webservice
        EXPOSE 80:8080/tcp
        CMD ./webservice

runcmd:
  - curl -fsSL https://download.docker.com/linux/ubuntu/gpg | apt-key add -
  - add-apt-repository "deb [arch=amd64] https://download.docker.com/linux/ubuntu $(lsb_release -cs) stable"
  - apt-get update -y
  - apt-get install -y docker-ce docker-ce-cli containerd.io
  - curl -L "https://github.com/docker/compose/releases/download/1.29.2/docker-compose-$(uname -s)-$(uname -m)" -o /usr/local/bin/docker-compose
  - chmod +x /usr/local/bin/docker-compose
  - curl -fsSL https://git.wmi.amu.edu.pl/s444498/cloud/raw/branch/master/Public_cloud/webservice > /root/webservice
  - systemctl start docker
  - systemctl enable docker
  - cd /root/
  - docker build -t webservice .
  - docker run -d -p 80:8080 -t 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=False))

loadbalancer = client.load_balancers.create(
    name= f"{PREFIX}-loadbalancer",
    load_balancer_type=LoadBalancerType(name="lb11"),
    location=Location("hel1"),
    targets=loadbalancer_targets,
    public_interface=True,
    services=[
        LoadBalancerService(
            protocol="http",
            listen_port=80,
            destination_port=80,
            proxyprotocol=False,
            health_check=LoadBalancerHealthCheck(
                protocol="http",
                port=80,
                interval=15,
                timeout=10,
                retries=3,
                http=LoadBalancerHealtCheckHttp(
                    path="/factors/32",
                    status_codes=["2??", "3??"],
                    tls=False
                )
            ),
            http=LoadBalancerServiceHttp(
                cookie_name='HCLBSTICKY',
                cookie_lifetime=300,
                sticky_sessions=True,
                certificates=[],
            ),
        ),
    ],
)

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}:80/factors/")

with open('url.txt', 'w') as f:
    url = 'http://'+load_balancer.data_model.public_net.ipv4.ip
    f.write(url)