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Install and Deploy NeonAI Diana

Device Independent API for Neon Applications (Diana) is a collection of microservices that add functionality to NeonAI systems. Diana microservices are deployed in a Kubernetes cluster.

After you have installed Diana, use diana --help to get detailed help.

For more information about using NeonAI, see the NeonAI documentation site.

Prerequisites

To install Diana:

  • Ubuntu 20.04 or later.
  • Diana will most likely work on other flavors of Linux, but we have not yet verified this.
  • Python 3.8 or later.
  • Pip Python package installer.

To deploy Diana:

  • Kubectl Kubernetes command-line tool.
  • Helm package manager for Kubernetes.
  • A Kubernetes installation.
  • The following instructions assume a local installation using Microk8s version 1.26/stable or later.
  • You can likely deploy Diana on a Kubernetes cluster in the cloud, but we have not yet verified this.

Use a Python virtual environment

We recommend you use a Python virtual environment for installing and testing Diana. In addition to the usual benefits, using a virtual environment makes it easier to ensure you are using the correct versions of Python and Diana.

  1. Create a Python virtual environment:

    python3.10 -m venv venv

  2. Open a new terminal window. Activate the Python virtual environment in this new window:

    . venv/bin/activate

    Using this new window, proceed with the instructions.

Install Diana

  1. Use Pip to install Diana:

    pip install --pre neon-diana-utils

    This command installs the newest pre-release version, which is described in this tutorial.

    Warning: You can use pip install neon-diana-utils to install the current stable version. Version 1.0.0 includes Helm chart support. For information on installing and running older versions, see the archived documentation in the README file.

    For more information on the available versions of Diana, see the Python Package Index repo for Neon Diana.

  2. Verify Diana is installed:

    diana --version

    Tip: If your computer does not recognize this command, you may need to add ~/.local/bin to your $PATH with a command like export PATH=$PATH:/home/${USER}/.local/bin.

Use diana --help for detailed information about Diana and its commands.

The output of diana --help looks like:

Usage: diana [OPTIONS] COMMAND [ARGS]...

  Diana: Device Independent API for Neon Applications.

  See also: diana COMMAND --help

Options:
  -v, --version  Print the current version
  --help         Show this message and exit.

Commands:
  configure-backend     Configure a Diana Backend
  configure-mq-backend  Configure RabbitMQ and export user credentials
  make-github-secret    Generate Kubernetes secret for Github images
  make-keys-config      Generate a configuration file with access keys
  make-rmq-config       Generate RabbitMQ definitions
  start-backend         Start a Diana Backend
  stop-backend          Stop a Diana Backend

Deploy NeonAI Diana

This example deploys Diana in a local Microk8s Kubernetes cluster.

Install and Run Microk8s

If you don't have Microk8s installed, you can install it and create the necessary user with:

sudo snap install microk8s --classic
sudo usermod -aG microk8s $USER
newgrp microk8s

  1. Start Microk8s:

    microk8s start

  2. Enable the services for persistent storage, DNS, and the Kubernetes dashboard:

    microk8s enable hostpath-storage microk8s enable dns microk8s enable dashboard

  3. Enable the MetalLB service:

    microk8s enable metallb

    At the prompt, enter a subnet which is not being used by your router. For example:

    10.10.10.10-10.10.10.10

    Note: Unless you plan on adding multiple nodes, this range only needs one address.

  4. After Microk8s is running, use microk8s kubectl create token default to create a Microk8s token.

  5. In the new terminal window, use microk8s kubectl port-forward -n kube-system service/kubernetes-dashboard 1443:443 to forward the dashboard port.

    You can now access your Kubernetes dashboard in a browser at https://localhost:1443/ using the token you created in step 2.

  6. The process in this terminal needs to keep running. Either background the process, or leave this terminal window open and open a new terminal window to continue working.

Set Up DNS

The ingress controller needs URLs to be mapped to services. There are a number of different ways you can accomplish this, depending on your networking setup.

For this guide, we will use the simple case of editing the /etc/hosts file.

  1. Edit the /etc/hosts file. Add one entry for the domain name of each service you intend to run. Add the canonical domain and point it to the IP address you gave MetalLB in step 3.

    For example, if you plan to run a service named test-service on the diana.k8s domain, add the following line:

    10.10.10.10 test-service.diana.k8s

    This tells your computer that test-service.diana.k8s is at IP address 10.10.10.10. Your computer will route all requests for test-service.diana.k8s to the Kubernetes cluster you set up at 10.10.10.10, instead of looking for it on the public internet.

    Add one line for each service. Point each service to the same IP address.

Prepare for Deployment

  1. After you set up your Kubernetes cluster and configure DNS, configure the Diana backend with:

    diana configure-mq-backend OUTPUT_PATH

    Replace OUTPUT_PATH with the directory where you want Diana to store its Helm charts and configurations. For example:

    diana configure-mq-backend ~/neon_diana

    Follow the prompts to provide any necessary configuration parameters.

  2. Optional: To add extra TCP ports (i.e. for RabbitMQ), update the OUTPUT_PATH/ingress-nginx/values.yaml file accordingly.

  3. Deploy the NGINX ingress:

    helm install ingress-nginx OUTPUT_PATH/ingress-common --namespace ingress-nginx --create-namespace

  4. Edit OUTPUT_PATH/diana-backend-values.yaml and update any necessary configuration. At minimum, you need to update the following parameters:

    • domain Change this to the domain you added to the /etc/hosts file in step 11.
    • letsencrypt.email If you are using a "real" domain, change this to the email address you want to use for the Let's Encrypt SSL certificate. For local testing, leave this as is.
    • letsencrypt.server If you are using a "real" domain, change this to a valid Let's Encrypt server address, such as https://acme-v02.api.letsencrypt.org/directory. For local testing, leave this as is.

Deploy the Diana Backend

  1. Update the Helm dependency:

    helm dependency update OUTPUT_PATH/diana-backend

  2. Use Helm to launch Diana:

    helm install diana-backend OUTPUT_PATH/test/diana-backend --namespace backend --create-namespace

    This creates the backend namespace and launches Diana into that namespace. You can change this to any namespace name you prefer. You may want to use separate namespaces for test versus production deployments, to separate the Diana backend from other deployments, or both.