Provision a Kubernetes / CoreOS Cluster on Linode

Automatically provision a scalable CoreOS/Kubernetes cluster on Linode with zero configuration.

The cluster will comprise of a single Kubernetes master host with a custom number of worker nodes.

What’s included

• Kubernetes 1.11.0 with Bootkube
• Load Balancer and automatic SSL/TLS renewal using Traefik
• Distributed block storage with Rook
• Pre-configured Grafana dashboard using Kube-Prometheus with Rook and Traefik monitoring
• Basic auth protected subdomains (assuming you are using example.com):
  • https://kube.example.com (Kubernetes Dashboard)
  • https://grafana.example.com (Grafana)
  • https://alertmanager.example.com (Alert Manager)
  • https://prometheus.example.com (Prometheus Web UI)
  • https://traefik.example.com (Traefik Web UI)

    Usage

    git clone https://github.com/kahkhang/kube-linode
    cd kube-linode
    chmod +x kube-linode.sh

    Just run ./kube-linode.sh create into your console, key in your configuration, then sit back and have a !
    Settings are stored in settings.env, or you can pass them in as key-value flags as such:

    ./kube-linode.sh --no_of_workers=3 --api_key=12345

    To increase the number of workers, modify NO_OF_WORKERS in settings.env as desired and run ./kube-linode.sh again.
    Use kubectl to control the cluster (e.g. kubectl get nodes)

    ---

If you want to destroy the cluster created by kube-linode, you can run the following command:

./kube-linode.sh destroy

A prompt will be given listing all the nodes which will be destroyed upon confirmation .

Dependencies

You should have a Linode account, which you can get here.
You should also have an API Key with a valid domain that uses Linode’s DNS servers.

OSX: brew install jq openssl curl kubectl

Arch Linux: Follow the instructions here

Acknowledgements

This script uses Bootkube to bootstrap the initial cluster using Linode’s API.