Author: Akshay Shinde
K8s Kind Voting App
A comprehensive guide for setting up a Kubernetes cluster using Kind on an AWS EC2 instance, installing and configuring Argo CD, and deploying applications using Argo CD.
Overview
This guide covers the steps to:
- Launch an AWS EC2 instance.
- Install Docker and Kind.
- Create a Kubernetes cluster using Kind.
- Install and access Kubectl.
- Set up the Kubernetes Dashboard.
- Install and configure Argo CD.
- Connect and manage your Kubernetes cluster with Argo CD.
- Set Up Prometheus & Grafana
Architecture
Observability
- A front-end web app in Python which lets you vote between two options
- A Redis which collects new votes
- A .NET worker which consumes votes and stores them in…
- A Postgres database backed by a Docker volume
- A Node.js web app which shows the results of the voting in real
Create Instance
Update system
sudo apt update
Install Docker
sudo apt-get install docker.io
Creating and Managing Kubernetes Clusters with Kind
Clear terminal:
clear
Create a 3-node Kubernetes cluster using Kind:
kind create cluster --config=config.yml
Check cluster information:
kubectl cluster-info --context kind-kind
kubectl get nodes
kind get clusters
Installing kubectl
curl -o kubectl https://amazon-eks.s3.us-west-2.amazonaws.com/1.19.6/2021-01-05/bin/linux/amd64/kubectl
chmod +x ./kubectl
sudo mv ./kubectl /usr/local/bin
kubectl version --short --client
Managing Docker and Kubernetes Pods
Check Docker containers running:
docker ps
List all Kubernetes pods in all namespaces:
kubectl get pods -A
Cloning and Running the Example Voting App
Clone the voting app repository:
git clone https://github.com/dockersamples/example-voting-app.git
cd example-voting-app/
Apply Kubernetes YAML specifications for the voting app:
kubectl apply -f k8s-specifications/
List all Kubernetes resources:
kubectl get all
Forward local ports for accessing the voting and result apps:
kubectl port-forward service/vote 5000:5000 --address=0.0.0.0 &
kubectl port-forward service/result 5001:5001 --address=0.0.0.0 &
Managing Files in Example Voting App
Navigate and view files:
cd ..
cd seed-data/
ls
cat Dockerfile
cat generate-votes.sh
Installing Argo CD
Create a namespace for Argo CD:
kubectl create namespace argocd
Apply the Argo CD manifest:
kubectl apply -n argocd -f https://raw.githubusercontent.com/argoproj/argo-cd/stable/manifests/install.yaml
Check services in Argo CD namespace:
kubectl get svc -n argocd
Expose Argo CD server using NodePort:
kubectl patch svc argocd-server -n argocd -p '{"spec": {"type": "NodePort"}}'
Forward ports to access Argo CD server:
kubectl port-forward -n argocd service/argocd-server 8443:443 &
Installing Kubernetes Dashboard
Deploy Kubernetes dashboard:
kubectl apply -f https://raw.githubusercontent.com/kubernetes/dashboard/v2.7.0/aio/deploy/recommended.yaml
Create a token for dashboard access:
kubectl -n kubernetes-dashboard create token admin-user
Argo CD Initial Admin Password
Retrieve Argo CD admin password:
kubectl get secret -n argocd argocd-initial-admin-secret -o jsonpath="{.data.password}" | base64 -d && echo
Install HELM
curl -fsSL -o get_helm.sh https://raw.githubusercontent.com/helm/helm/main/scripts/get-helm-3
chmod 700 get_helm.sh
./get_helm.sh
Install Kube Prometheus Stack
helm repo add prometheus-community https://prometheus-community.github.io/helm-charts
helm repo add stable https://charts.helm.sh/stable
helm repo update
kubectl create namespace monitoring
helm install kind-prometheus prometheus-community/kube-prometheus-stack --namespace monitoring --set prometheus.service.nodePort=30000 --set prometheus.service.type=NodePort --set grafana.service.nodePort=31000 --set grafana.service.type=NodePort --set alertmanager.service.nodePort=32000 --set alertmanager.service.type=NodePort --set prometheus-node-exporter.service.nodePort=32001 --set prometheus-node-exporter.service.type=NodePort
kubectl get svc -n monitoring
kubectl get namespace
kubectl port-forward svc/kind-prometheus-kube-prome-prometheus -n monitoring 9090:9090 --address=0.0.0.0 &
kubectl port-forward svc/kind-prometheus-grafana -n monitoring 31000:80 --address=0.0.0.0 &
Prometheus Queries
kubectl port-forward svc/kind-prometheus-kube-prome-prometheus -n monitoring 9090:9090 --address=0.0.0.0 &
kubectl port-forward svc/kind-prometheus-grafana -n monitoring 31000:80 --address=0.0.0.0 &
Grafana Dashboard
Grafana Monitoring
Deleting Kubernetes Cluster
kind delete cluster --name=kind
Happy Learning 😊
Author: Akshay Shinde