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Kubernetes on DigitalOcean with CoreOS

Let's look at an example of how to launch a Kubernetes cluster from scratch on DigitalOcean, including kubeadm, an Nginx Ingress controller, and Letsencrypt certificates.

Overview

Environment

We'll be creating a four-node cluster (k8s-master, k8s-000...k8s-002), load balancer, and ssl certificates.

Table of Contents

1. Install Kubernetes

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#!/bin/bash

sudo su
echo "Initializing docker service ..."
systemctl enable docker && systemctl start docker
echo "Docker service initialized successfully."

echo "Installing CNI ..."
CNI_VERSION="v0.6.0"
mkdir -p /opt/cni/bin

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PUBLIC_IP=$(ip -f inet -o addr show eth0|cut -d\  -f 7 | cut -d/ -f 1 | head -n 1)
sudo kubeadm init --apiserver-advertise-address=$PUBLIC_IP  --pod-network-cidr=10.244.0.0/16

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sudo sysctl net.bridge.bridge-nf-call-iptables=1
kubectl apply -f https://raw.githubusercontent.com/coreos/flannel/v0.10.0/Documentation/kube-flannel.yml

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kubectl apply -f https://raw.githubusercontent.com/kubernetes/ingress-nginx/master/deploy/namespace.yaml
kubectl apply -f https://raw.githubusercontent.com/kubernetes/ingress-nginx/master/deploy/default-backend.yaml
kubectl apply -f https://raw.githubusercontent.com/kubernetes/ingress-nginx/master/deploy/configmap.yaml
kubectl apply -f https://raw.githubusercontent.com/kubernetes/ingress-nginx/master/deploy/tcp-services-configmap.yaml
kubectl apply -f https://raw.githubusercontent.com/kubernetes/ingress-nginx/master/deploy/udp-services-configmap.yaml
kubectl apply -f https://raw.githubusercontent.com/kubernetes/ingress-nginx/master/deploy/rbac.yaml
kubectl apply -f https://raw.githubusercontent.com/kubernetes/ingress-nginx/master/deploy/with-rbac.yaml
kubectl apply -f https://raw.githubusercontent.com/kubernetes/ingress-nginx/master/deploy/provider/baremetal/service-nodeport.yaml

kubectl get svc -n ingress-nginx

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   {
        "name": "answer_and_sources",
        "description": "Gets an answer and cites the relevant sources used to provide the answer.",
        "parameters": {
            "type": "object",
            "properties": {
                "answer": {
                    "type": "string",
                    "description": "The answer to the user's question.",
                },

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$ python hours.py image.jpg
{
  "day_hours": [
    {
      "day": "Mon - Fri",
      "hours": "7 AM - 5 PM"
    },
    {
 "day": "Saturday",

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