How to setup monitoring on Kubernetes Cluster using Prometheus and Grafana | Setup monitoring on EKS Cluster using Prometheus and Grafana

What is Prometheus?

• Prometheus is an open source monitoring tool
• Provides out-of-the-box monitoring capabilities for the Kubernetes container orchestration platform. It can monitor servers and databases as well.
• Collects and stores metrics as time-series data, recording information with a timestamp 
• It is based on pull and collects metrics from targets by scraping metrics HTTP endpoints.

What is Grafana?

• Grafana is an open source visualization and analytics software. 
• It allows you to query, visualize, alert on, and explore your metrics no matter where they are stored.

Please Watch this steps in YouTube Channel:

Prometheus Architecture

Key components:

    1. Prometheus server - Processes and stores metrics data

    2. Alert Manager - Sends alerts to any systems/channels

    3. Grafana - Visualize scraped data in UI

Installation Method

The are are many ways you can setup Prometheus and Grafana. You can install in following ways:

1. Create all configuration files of both Prometheus and Grafana and execute them in right order.

2. Prometheus Operator - to simplify and automate the configuration and management of the Prometheus monitoring stack running on a Kubernetes cluster

3. Helm chart (Recommended) - Using helm to install Prometheus Operator including Grafana

Why to use Helm?

Helm is a package manager for Kubernetes. Helm simplifies the installation of all components in one command. Install using Helm is recommended as you will not be missing any configuration steps and very efficient. 

Prerequisites

• Kubernetes cluster is setup already
• Install Helm
• EC2 instance to access EKS cluster

Implementation steps

We need to add the Helm Stable Charts for your local client. Execute the below command:

helm repo add stable https://charts.helm.sh/stable

# Add prometheus Helm repo

helm repo add prometheus-community https://prometheus-community.github.io/helm-charts

helm search repo prometheus-community

Prometheus and grafana helm chart moved to kube prometheus stack

Create Prometheus namespace

kubectl create namespace prometheus

Below is helm command to install kube-prometheus-stack. The helm repo kube-stack-prometheus (formerly prometheus-operator) comes with a grafana deployment embedded.

helm install stable prometheus-community/kube-prometheus-stack -n prometheus

Lets check if prometheus and grafana pods are running already

kubectl get pods -n prometheus

kubectl get svc -n prometheus

This confirms that prometheus and grafana have been installed successfully using Helm.

In order to make prometheus and grafana available outside the cluster, use load balancer or NodePort.

Edit Prometheus Service

kubectl edit svc stable-kube-prometheus-sta-prometheus -n prometheus

Edit Grafana Service

kubectl edit svc stable-grafana -n prometheus

Verify if service is changed to LoadBalancer and also to get the Load Balancer URL.

kubectl get svc -n prometheus

Access Grafana UI in the browser

Get the URL from the above screenshot and put in the browser

UserName: admin

Password: prom-operator

Create Dashboard in Grafana

In Grafana, we can create various kinds of dashboards as per our needs.

How to Create Kubernetes Monitoring Dashboard?

For creating a dashboard to monitor the cluster:

Click '+' button on left panel and select ‘Import’.

Enter 12740 dashboard id under Grafana.com Dashboard.

Click ‘Load’.

Select ‘Prometheus’ as the endpoint under prometheus data sources drop down.

Click ‘Import’.

This will show monitoring dashboard for all cluster nodes

How to Create Kubernetes Cluster Monitoring Dashboard?

For creating a dashboard to monitor the cluster:

Click '+' button on left panel and select ‘Import’.

Enter 3119 dashboard id under Grafana.com Dashboard.

Click ‘Load’.

Select ‘Prometheus’ as the endpoint under prometheus data sources drop down.

Click ‘Import’.

This will show monitoring dashboard for all cluster nodes

Create POD Monitoring Dashboard

For creating a dashboard to monitor the cluster:

Click '+' button on left panel and select ‘Import’.

Enter 6417 dashboard id under Grafana.com Dashboard.

Click ‘Load’.

Select ‘Prometheus’ as the endpoint under prometheus data sources drop down.

Click ‘Import’.

This will show monitoring dashboard for all cluster nodes.

No such property: docker for class: groovy.lang.Binding | Jenkins Pipeline Error Docker Build | Jenkins docker pipeline error

Jenkins Pipeline Error: 

groovy.lang.MissingPropertyException: No such property: docker for class: groovy.lang.Binding.

We most likely encountered the same issue, in order to fix it, install Docker Pipeline plugin in Jenkins:

Root Cause and Fix:

Jenkins need to have Docker Pipeline plug-in to perform Docker builds.

Jenkins > Manage Jenkins > Manage Plugins > Available tab

Search for Docker Pipeline install it, restart Jenkins and you are ready to go.

How to check whether my user data passing to EC2 instance is working | AWS EC2 bootstrap script log

The cloud-init output log file (/var/log/cloud-init-output.log) captures console output so it is easy to debug your scripts following a launch if the instance does not behave the way you intended.

Check the Logs in EC2 instance

Login to EC2 instance, and type the below command:

tail -f /var/log/cloud-init-output.log

This will give the output of bootstrap execution

Automate EKS Cluster using Bootstrap Script | Bootstrap script for setting up Jenkins, Docker and EKS Cluster in AWS cloud

Pre-requistes:

You need to create an IAM role with Administrator Access policy and attach that IAM role to EC2 instance while you provision.

Click on Advanced Details and under user data:

Script for setting up Jenkins, Docker and setting EKS cluster using eksctl command:

#!/bin/bash

# Shell script for installing Java,  Maven, Jenkins, EKS Cluster in Ubuntu EC2 instance

# Command for installing Java 11

sudo apt-get update

sudo apt-get install default-jdk -y

# Command for installing maven

sudo apt-get install maven -y

# Script for Jenkins installation

#Add Repository key to the system

wget -q -O - https://pkg.jenkins.io/debian/jenkins.io.key | sudo apt-key add -

#  Append debian package repo address to the system

echo deb http://pkg.jenkins.io/debian-stable binary/ | sudo tee /etc/apt/sources.list.d/jenkins.list

sudo apt-get update

# Install Jenkins

sudo apt-get install jenkins -y

echo "Jenkins installed successfully.."

#Install Docker

sudo apt-get update

#Install the below packages

sudo apt install gnupg2 pass -y

#Install docker

sudo apt install docker.io -y

#Add Ubuntu user to Docker group

sudo usermod -aG docker $USER

# start Docker

sudo systemctl start docker

sudo systemctl enable docker

sudo systemctl status docker

sudo usermod -a -G docker jenkins

sudo service jenkins restart

#Reload system daemon files

sudo systemctl daemon-reload

#Restart Docker service as well

sudo service docker stop

sudo service docker start

# Install AWS CLI

curl "https://awscli.amazonaws.com/awscli-exe-linux-x86_64.zip" -o "awscliv2.zip" 

sudo apt install unzip

sudo unzip awscliv2.zip  

sudo ./aws/install

aws --version

#Install eksctl on Linux

curl --silent --location "https://github.com/weaveworks/eksctl/releases/latest/download/eksctl_$(uname -s)_amd64.tar.gz" | tar xz -C /tmp

#Move the extracted binary to /usr/local/bin. 

sudo mv /tmp/eksctl /usr/local/bin

eksctl version

# Install Kubectl

sudo curl --silent --location -o /usr/local/bin/kubectl https://s3.us-west-2.amazonaws.com/amazon-eks/1.22.6/2022-03-09/bin/linux/amd64/kubectl

sudo chmod +x /usr/local/bin/kubectl

kubectl version --short --client

# Install HELM

curl -fsSL -o get_helm.sh https://raw.githubusercontent.com/helm/helm/master/scripts/get-helm-3

sudo chmod 700 get_helm.sh

sudo ./get_helm.sh

helm version --client

sudo su - jenkins

#Create EKS cluster using eksctl command

eksctl create cluster --name demo-eks --region us-east-2 --nodegroup-name my-nodes --node-type t3.small --managed --nodes 2 

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Install kubectl on Ubuntu Instance | How to install kubectl in Ubuntu | Install kubectl on Linux Instance

Kubernetes uses a command line utility called kubectl for communicating with the cluster API server. It is tool for controlling Kubernetes clusters. kubectl looks for a file named config in the $HOME directory.

sudo curl --silent --location -o /usr/local/bin/kubectl   https://s3.us-west-2.amazonaws.com/amazon-eks/1.22.6/2022-03-09/bin/linux/amd64/kubectl

sudo chmod +x /usr/local/bin/kubectl 

Verify if kubectl got installed

kubectl version --short --client

error: exec plugin: invalid apiVersion "client.authentication.k8s.io/v1alpha1"

Kubectl Error:

you may get this error when ever you are running kubectl command

error: exec plugin: invalid apiVersion "client.authentication.k8s.io/v1alpha1"

Solution: 

Make sure you update kubeconfig with below command:

aws eks update-kubeconfig --name ${EKS_CLUSTER_NAME} --region ${REGION}

How to install AWS CLI: 

Please click on the below link:

https://www.coachdevops.com/2020/10/install-aws-cli-version-2-on-linux-how.html