Reassigning Floating IP Between Hetzner Cloud Servers

Question

Pulumi · Accepted Answer

Reassigning a floating IP between cloud servers in Hetzner Cloud can be accomplished through infrastructure as code using Pulumi. To illustrate how to perform this action, the following Pulumi program demonstrates the necessary steps in TypeScript.

Before diving into the code, let's outline what we're going to do:
1. We will create two Hetzner Cloud servers.
2. We will allocate a floating IP.
3. We will create a script that can be run to reassign the floating IP between the two servers.

To achieve these tasks, we will use the Hetzner Cloud Pulumi provider, which enables us to manage our Hetzner Cloud resources programmatically. Note that at the time of writing, there might not be direct support for Hetzner Cloud in Pulumi's official providers, so we may need to use custom resource options or external provider plugins.

Here is a conceptual program since an official Hetzner Cloud provider is not available in the Pulumi Registry. Let's assume you have set up the Pulumi provider for Hetzner Cloud, and it has similar interfaces as other cloud providers. The actual function names and properties will differ, and this program serves as an educational template.

```typescript
import * as hetzner from "@pulumi/hetzner"; // Assuming a hypothetical Hetzner Cloud provider

// Create the first Hetzner Cloud server.
const server1 = new hetzner.Server("server1", {
    name: "server1",
    image: "ubuntu-20.04",
    serverType: "cx11",
});

// Create the second Hetzner Cloud server.
const server2 = new hetzner.Server("server2", {
    name: "server2",
    image: "ubuntu-20.04",
    serverType: "cx11",
});

// Allocate a floating IP.
const floatingIp = new hetzner.FloatingIp("floatingIp", {
    homeLocation: "fsn1", // The initial home location should be specified.
    type: "ipv4",         // The type can be "ipv4" or "ipv6".
});

// Function that reassigns the floating IP to a given server.
// NOTE: This function is conceptual and does not represent real Pulumi functionality.
function reassignFloatingIp(floatingIpId: string, serverId: string) {
    const assignment = new hetzner.FloatingIpAssignment("ipAssignment", {
        floatingIpId: floatingIpId,
        serverId: serverId,
    });

return assignment;
}

// Example usage of reassigning the floating IP from `server1` to `server2`.
// You can call this function with arguments as per your requirement to switch between servers.
const ipAssignment = reassignFloatingIp(floatingIp.id, server2.id);

// Export relevant data.
export const server1Id = server1.id;
export const server2Id = server2.id;
export const floatingIpId = floatingIp.id;
export const assignedServerId = ipAssignment.serverId;
```

In this program, we create two servers and a floating IP. We then define a function to reassign the floating IP to a given server, showcasing how you might switch the floating IP between servers.

Please remember to replace the `@pulumi/hetzner` import with the actual import path of the Hetzner Cloud Pulumi provider if one is available in your development setup. In a real-world scenario, you would need to refer to the official documentation for the exact resource names, types, and properties.

This conceptual program assumes simple resource relationships, but in reality, you might have to deal with dependencies, asynchronous operations, or additional configuration parameters, which are part of Pulumi's programming model.