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Jenkins-K8s

Project about deploying Jenkins in Kubernetes (AWS EKS) platform

Jenkins Architecture on Kubernetes EKS Cluster

Jenkins Architecture

Deploy Kubernetes EKS Cluster (AWS) using eksctl

Run in 2 steps:

eksctl create cluster --name "my-cluster" --region "us-east-1" --zones "us-east-1a,us-east-1b" --version 1.24 --node-type "t2.small" --nodes 2 --nodes-min 1 --nodes-max 2 --spot
eksctl utils associate-iam-oidc-provider --region="us-east-1" --cluster="my-cluster" --approve

Or everything in one step:

eksctl create cluster --name "my-cluster" --region "us-east-1" --zones "us-east-1a,us-east-1b" --version 1.24 --node-type "t2.small" --nodes 2 --nodes-min 1 --nodes-max 2 --with-oidc --alb-ingress-access --spot

Update your local kubeconfig file to access the EKS Cluster just created. Replace us-east-1 with the name of the AWS region you're using, and my-cluster with the name of your EKS cluster:

aws eks update-kubeconfig --region "us-east-1" --name "my-cluster"

Verify you can successfully connect to the EKS Cluster:

kubectl cluster-info
kubectl get nodes
NAME                             STATUS   ROLES    AGE    VERSION
ip-192-168-13-120.ec2.internal   Ready    <none>   149m   v1.24.7-eks-fb459a0
ip-192-168-53-51.ec2.internal    Ready    <none>   149m   v1.24.7-eks-fb459a0

Install the Amazon EBS CSI driver

Official Amazon AWS documentation: https://docs.aws.amazon.com/eks/latest/userguide/ebs-csi.html

Create the EBS CSI IAM role

In the following code, replace my-cluster with the name of your EKS Cluster and run the command:

eksctl create iamserviceaccount \
  --name ebs-csi-controller-sa \
  --namespace kube-system \
  --cluster my-cluster \
  --attach-policy-arn arn:aws:iam::aws:policy/service-role/AmazonEBSCSIDriverPolicy \
  --approve \
  --role-only \
  --role-name AmazonEKS_EBS_CSI_DriverRole

Install EBS CSI driver using eksctl

In the following code, replace my-cluster with the name of your EKS Cluster, 111122223333 with your AWS Account ID and run the command:

eksctl create addon --name aws-ebs-csi-driver --cluster my-cluster --service-account-role-arn arn:aws:iam::111122223333:role/AmazonEKS_EBS_CSI_DriverRole

Install EBS CSI driver using AWS CLI

aws eks create-addon --cluster-name my-cluster --addon-name aws-ebs-csi-driver --service-account-role-arn arn:aws:iam::111122223333:role/AmazonEKS_EBS_CSI_DriverRole

Install EBS CSI driver using AWS Console

Add the Amazon EBS CSI Driver using the AWS Console:

  • Go to your EKS Cluster, select Add-ons section and click on Get more add-ons: Get more add-ons
  • Select the Amazon EBS CSI Driver: Select the Amazon EBS CSI Driver
  • Select the AmazonEKS_EBS_CSI_DriverRole: Select the AmazonEKS_EBS_CSI_DriverRole
  • Create the AmazonEKS_EBS_CSI_DriverRole: Create the AmazonEKS_EBS_CSI_DriverRole

Install Prometheus for Cluster Monitoring

Install the Prometheus helm chart for monitoring the Kubernetes Cluster:

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

Install the AWS Load Balancer Controller

Official Amazon AWS documentation: https://docs.aws.amazon.com/eks/latest/userguide/aws-load-balancer-controller.html

Run:

curl -o iam_policy.json https://raw.githubusercontent.com/kubernetes-sigs/aws-load-balancer-controller/v2.4.4/docs/install/iam_policy.json
aws iam create-policy --policy-name AWSLoadBalancerControllerIAMPolicy --policy-document file://iam_policy.json

In the following code, replace my-cluster with the name of your EKS Cluster and 111122223333 with your AWS Account ID. Then run the command:

eksctl create iamserviceaccount \
  --cluster=my-cluster \
  --namespace=kube-system \
  --name=aws-load-balancer-controller \
  --role-name "AmazonEKSLoadBalancerControllerRole" \
  --attach-policy-arn=arn:aws:iam::111122223333:policy/AWSLoadBalancerControllerIAMPolicy \
  --approve 

helm repo add eks https://aws.github.io/eks-charts
helm repo update

In the following code, replace my-cluster with the name of your EKS Cluster, 602401143452 and us-east-1 with the values corresponding to the AWS region you're using (Check here), and run the command:

helm install aws-load-balancer-controller eks/aws-load-balancer-controller \
  -n kube-system \
  --set clusterName=my-cluster \
  --set serviceAccount.create=false \
  --set serviceAccount.name=aws-load-balancer-controller \
  --set image.repository=602401143452.dkr.ecr.us-east-1.amazonaws.com/amazon/aws-load-balancer-controller

Installing the Jenkins deployment

kubectl apply -f namespace.yaml
kubectl apply -f serviceAccount.yaml
kubectl apply -f volume.yaml
kubectl apply -f deployment.yaml
kubectl apply -f service.yaml

Setup the AWS ALB Ingress

Get the list of public subnets in the cluster.

  • Using eksctl in the console:
eksctl get cluster my-cluster
NAME            VERSION STATUS  CREATED                 VPC                     SUBNETS                                                                                                 SECURITYGROUPS          PROVIDER
my-cluster      1.24    ACTIVE  2022-12-12T14:38:34Z    vpc-0d3480fcbf26b253b   subnet-04fb2b4252c3e38b2,subnet-0c4b6807f56cbd85d,subnet-0ce7fbd629a3db193,subnet-0d4585057389798f7     sg-0c47545165b23b5d0    EKS
  • Using the AWS Management Console: List of public subnets

Edit the ingress.yaml file. In the alb.ingress.kubernetes.io/subnets param add the public subnet list. Have in account to add just one subnet por availability zone:

annotations:
  alb.ingress.kubernetes.io/subnets: subnet-0c4b6807f56cbd85d,subnet-0ce7fbd629a3db193

Create the ingress:

kubectl apply -f ingress.yaml

Verify the correct ALB creation in the AWS Management Console:

Accessing Jenkins

Access Jenkins through the DNS name of the Application Load Balancer:

Jenkins Initial Setup

To get the initial administrator password we need to check the Jenkins pod logs. To identify the Jenkins pods run:

kubectl get pods -n devops-tools
NAME                       READY   STATUS    RESTARTS   AGE
jenkins-5ddc766476-ll82g   1/1     Running   0          88m

Get the last 20 log lines of the jenkins pod:

kubectl logs jenkins-5ddc766476-ll82g --tail 20 -n devops-tools
*************************************************************
*************************************************************

Jenkins initial setup is required. An admin user has been created and a password generated.
Please use the following password to proceed to installation:

a14f39190fa44226af623ce9560b0d7b

This may also be found at: /var/jenkins_home/secrets/initialAdminPassword

*************************************************************
*************************************************************

Enter the password, install the suggested plugins, create the first administrator user and access Jenkins:

Installing plugins Jenkins Reaady