K8s and Prometheus cluster deployment

This repository shows how to deploy an application in a kubernetes cluster, to be monitored by Prometheus, which will be installed in the cluster as well.

The deployed application will be Grafana, which already exposes metrics in Prometheus format.

Grafana demo url: http://35.196.26.65:30003

Prometheus demo url: http://35.196.26.65:30009

Cluster setup

Install docker, kubectl, kubelet and kubeadm on hosts machines:

apt udpate
curl -fsSL https://get.docker.com | bash
curl -s https://packages.cloud.google.com/apt/doc/apt-key.gpg | apt-key add -
echo "deb http://apt.kubernetes.io/ kubernetes-xenial main" > /etc/apt/sources.list.d/kubernetes.list
apt update && apt install -y kubelet kubeadm kubectl

Init kubernetes cluster on master host:

echo "source <(kubectl completion bash)" >> ~/.bashrc
kubeadm init --apiserver-advertise-address=$(hostname -i) --ignore-preflight-errors=SystemVerification
mkdir -p $HOME/.kube
cp -i /etc/kubernetes/admin.conf $HOME/.kube/config
chown $(id -u):$(id -g) $HOME/.kube/config

Note: ignore system verification means bypassing kubernetes warning about using the newest version of docker

Join cluster on other nodes:

kubeadm join <MASTER_IP_ADDRESS>:<PORT> --token <TOKEN> --discovery-token-ca-cert-hash <HASH> --ignore-preflight-errors=SystemVerification

Init network addon (wavenet) on master host:

kubectl apply -f "https://cloud.weave.works/k8s/net?k8s-version=$(kubectl version | base64 | tr -d '\n')"

Deployment

List available nodes:

kubectl get nodes -o wide

Create configuration map required to mount prometheus volume:

kubectl create -f configmap.yml

Create kubernetes deployment from configuration file:

kubectl create -f deploy.yml

List created deployments:

kubectl get deployments -o wide

Create a service to manage incoming requests:

kubectl create -f service.yml

List created services:

kubectl get services -o wide

List all created resources:

kubectl get all -o wide

References

Linux Tips

IBM FSS FCI and Counter Fraud Management

Kubernetes Interactive Tutorial

DevOps Cube