Merge pull request #29 from simonostendorf/dev

Fix/readme and script (#28)

README.md

@@ -17,7 +17,7 @@ This repository only holds the code for the documentation and deployments.
 [![GitHub release](https://img.shields.io/github/release/simonostendorf/k3s-hetzner?include_prereleases=&sort=semver&color=blue)](https://github.com/simonostendorf/k3s-hetzner/releases/)
 
 ### license
-[![License](https://img.shields.io/badge/License-MIT-blue)](#license)
+[![License](https://img.shields.io/badge/License-CC--BY--SA--4.0%20license-blue)](#license)
 
 ### issues
 [![issues - k3s-hetzner](https://img.shields.io/github/issues/simonostendorf/k3s-hetzner)](https://github.com/simonostendorf/k3s-hetzner/issues)
@@ -35,7 +35,7 @@ Be shure to read the [contribution guidelines](CONTRIBUTING.md) and the [code of
 ## License
 
 Copyright © 2020 Simon Ostendorf  
-This project is licensed under the [MIT License](LICENSE).
+This project is licensed under the [CC-BY-4.0 license](LICENSE).
 
 ## Credits
 Huge thank you to many people and git repos where I got my information and commands from.  

docs/prerequisites/container-registry.md

@@ -0,0 +1,29 @@
+# Container Registry
+To provide docker container images for the cluster you will need a container registry.  
+In this example i will use the [docker-hub](https://hub.docker.com/) but feel free to use other platforms like [github-container-registry](https://docs.github.com/en/packages/working-with-a-github-packages-registry/working-with-the-container-registry) or something else.  
+
+## Create Account
+First, create an account at your container-registry provider. If you already have one, you can skip this step.  
+If you want to use a docker-hub account, you can register [here](https://hub.docker.com/signup).
+
+<img src="../../assets/prerequisites/container-repository/create-account.png" width=40%>
+
+## Create Token
+To access the registry and push or pull images (pull only of you use private images) you will need a token.
+
+If you use the docker-hub, move to your [security-profile-page](https://hub.docker.com/settings/security) for the token creation.  
+The names of the tokens are not important, but you should know which token is for which purpose.  
+
+!!! note "Reminder"
+    Be shure to save the token in a save place because you need it later in the setup.  
+    The token is only shown once. 
+
+You will need to create the following tokens:
+
+  * `local-machine` with **write-access** used for your local machine to push the created images
+
+If you want to use private images you also need to create a token for the cluster to pull the images: 
+
+  * `k8s-hetzner` with **read-access** used on the kubernetes hosts to pull the images from the container registry
+
+<img src="../../assets/prerequisites/container-repository/create-token.png" width=60%>

scripts/setup-agent-nodes.py

@@ -0,0 +1,39 @@
+import argparse
+from hcloud import Client
+
+def find_used_ips(network, ip_begin):
+    max_ip = 0
+    for srv in network.data_model.servers:
+        server_id = srv.data_model.id
+        server_obj = client.servers.get_by_id(server_id)
+        private_net = server_obj.data_model.private_net[0]
+
+        if private_net.ip.startswith(ip_begin):
+            curr_ip = int(private_net.ip.split('.')[3])
+            if curr_ip > max_ip:
+                max_ip = curr_ip
+    return max_ip
+
+parser = argparse.ArgumentParser()
+
+parser.add_argument('--token', help='Hetzner Cloud API Token', required=True)
+parser.add_argument('--server_name', help='Server Name', required=True)
+parser.add_argument('--network_id', help='Private Network ID', required=True)
+
+args = parser.parse_args()
+
+client = Client(token=args.token)
+
+server = client.servers.get_by_name(args.server_name)
+
+network = client.networks.get_by_id(args.network_id)
+
+if server.data_model.datacenter.location.name == "hel1":
+    max_ip = find_used_ips(network, "10.2.0.")
+    server.attach_to_network(network=client.networks.get_by_id(args.network_id), ip="10.2.0." + str(max_ip + 1))
+elif server.data_model.datacenter.location.name == "fsn1":
+    max_ip = find_used_ips(network, "10.2.1.")
+    server.attach_to_network(network=client.networks.get_by_id(args.network_id), ip="10.2.1." + str(max_ip + 1))
+elif server.data_model.datacenter.location.name == "nbg1":
+    max_ip = find_used_ips(network, "10.2.2.")
+    server.attach_to_network(network=client.networks.get_by_id(args.network_id), ip="10.2.2." + str(max_ip + 1))