Host Deep Learning Models on DigitalOcean Droplets.

Question

Pulumi · Accepted Answer

To host deep learning models on DigitalOcean droplets using Pulumi, you'll need to address a few core components. Here is what you need to do, explained step-by-step:

1. **Create a DigitalOcean Droplet**: A droplet is a virtual server (VM) where you can deploy your applications and services. It's the foundation for hosting anything on DigitalOcean.

2. **Select an appropriate image**: You need to select an operating system image that has the necessary libraries and dependencies for deep learning. DigitalOcean provides base images for common operating systems, but you may also use a custom image pre-built with deep learning frameworks like TensorFlow or PyTorch.

3. **Configure Networking and Security**: Assign a public IP, set up a firewall to control the access to the droplet, and use SSH keys for secure access.

4. **Attach Extra Storage (if necessary)**: For large deep learning models and datasets, you may need additional block storage beyond what comes standard with a droplet.

5. **Deploy Your Model**: Upload your model and any associated data. If you're using a custom image that already contains the model, this step may just involve launching some services.

Here is a program written in Python using Pulumi which outlines the steps above:

```python
import pulumi
import pulumi_digitalocean as digitalocean

# Step 1: Create a new SSH key for secure access to our droplet
ssh_key = digitalocean.SshKey("my-ssh-key",
    public_key="ssh-rsa AAAAB3Nza... user@example.com") # Replace with your actual public SSH key

# Step 2: Create a DigitalOcean Droplet with an image that has deep learning libraries
# Such as a custom image or marketplace images like TensorFlow or PyTorch,
# or use a base image and configure it using `user_data`.
droplet = digitalocean.Droplet("deep-learning-droplet",
    image="ubuntu-20-04-x64",  # Replace with your chosen image
    region="nyc3",
    size="s-4vcpu-8gb",  # Choose the size based on your model's requirements
    ssh_keys=[ssh_key.fingerprint],
    backups=False,
    ipv6=True,
    user_data="""#cloud-config
        runcmd:
        - echo 'Hello, Deep Learning on DigitalOcean!' > /root/hello
    """)  # This script runs on first boot, use it to install libraries/frameworks

# Step 3: Set up a firewall to only allow SSH access
firewall = digitalocean.Firewall("deep-learning-firewall",
    droplet_ids=[droplet.id],
    inbound_rules=[
        {
            "protocol": "tcp",
            "port_range": "22",
            "source_addresses": ["0.0.0.0/0"],
        }
    ],
    outbound_rules=[
        {
            "protocol": "tcp",
            "port_range": "All",
            "destination_addresses": ["0.0.0.0/0"],
        },
        {
            "protocol": "udp",
            "port_range": "All",
            "destination_addresses": ["0.0.0.0/0"],
        },
    ])

# Optional Step 4: Attach a block storage volume if additional storage is needed for models
volume = digitalocean.Volume("deep-learning-volume",
    region=droplet.region,
    size=100,  # Specify the size in gigabytes
    tags=["deep-learning-storage"])

# Attach the storage volume to the droplet
volume_attachment = digitalocean.VolumeAttachment("deep-learning-volume-attachment",
    droplet_id=droplet.id,
    volume_id=volume.id)

# Export the droplet IP address so we know where to connect
pulumi.export('droplet_ip', droplet.ipv4_address)

# Export the Volume ID for reference
pulumi.export('volume_id', volume.id)
```

### Explanation of the Resources:

- **`digitalocean.SshKey`**: This resource manages the SSH keys for DigitalOcean, allowing you to securely access your droplet via SSH.

- **`digitalocean.Droplet`**: This is the core resource that represents a virtual machine in DigitalOcean. Here, we set up the droplet with a predefined image (in this case, a placeholder for an actual Ubuntu image). You would select or customize one that contains your deep learning libraries and dependencies.

- **`user_data`**: This is a script that runs on the first boot of the droplet. This can be used to install deep learning libraries or any other setup tasks. The placeholder example simply creates a file with a hello message.

- **`digitalocean.Firewall`**: This resource sets up firewall rules to control access to your droplets. We've allowed only SSH access here, but you might need to configure additional rules depending on your requirements, such as opening ports for a web server.

- **`digitalocean.Volume` and `digitalocean.VolumeAttachment`**: These resources manage additional block storage volumes. These are useful if you have large datasets or models that require more storage than the droplet provides by default.

After running this program with the Pulumi CLI, you will have a DigitalOcean Droplet ready for deploying your deep learning models. You can also modify the `user_data` script to install any required libraries or dependencies automatically when the droplet is created.