We use cookies & other similar technology to collect data to improve your experience on our site, . I did consider using native Kubernetes jobs, but I wanted the user-friendly features that Jenkins offers like console streaming, retries, easily-visible history and a UI if things ever need to be investigated manually. Lets use configuration-as-code to define a job. You can also restrict access by specifying individual resource actions. You should now be able to see the Jenkins Getting Started page in your browser at http://localhost:3000. Destroy: The destroy command deletes all of the resources in the Terraform configuration. Go to AWS Console and search s3, and look at that! First, lets make sure our Kubernetes context is set up. The bucket will be named jenkins-artifacts-s3bucket-jason2023 and will have a private ACL. All thats left for us is to determine the IP address of the minikube VM. Step 1: Create a Namespace for Jenkins. The role of a persistent volume is to store basic Jenkins data and preserve it On the Unlock Jenkins page, paste this password into the Administrator Now, run terraform plan. improved operational excellence). A Jenkins primary instance Deployment with a replica count of one and defined resource requests. The example from the docs - with the hub_profile removed - is good enough. Like men in black neutralizer! For our Jenkins installation, we will use the handy dandy stable helm chart. I also wanted it to be fully managed through code (no clicking around on a UI if the instance needs to be rebuilt, and itd also be great if this was reusable for similar future use-cases). The app connects to Azure Cosmos DB. crash, deletion, node failure), Kubernetes will schedule a new pod to the cluster. I welcome any constructive feedback you may have, as it will help me to improve and better serve your needs. Alright. Provision Instructions Copy and paste into your Terraform configuration, insert the variables, and run terraform init : module " deployment " { source = " terraform-iaac/deployment/kubernetes " version = " 1.4.3 " # insert the 2 required variables here } Readme Inputs ( 43 ) Outputs ( 2 ) Dependency ( 1 ) Resource ( 1 ) https://www.jenkins.io/doc/book/installing/linux/. Finally, after customizing Jenkins with public_ipaddress with port8080 included at the end. You can click through the admin panel to enable the functions, but were trying to do this all through code and dont want any manual steps. Setting up Jenkins on GKE | Kubernetes Engine | Google Cloud The target port is the port to access the Pods targeted by this service. When it does, log back in with your admin credentials. Terraform - Kubernetes - Jenkins. With Jenkins as the backbone, you'll programmatically control all the pieces of your pipeline via modern APIs. It was built with immutability and declarative configuration as code in mind, to automate many of the manual tasks required The 'jenkins-admin' cluster role has all the permissions to manage the cluster components. Because weve done this, we wont have to pass the --namespace argument to all of our future commands. Configure the Kubernetes Namespace, Jenkins URL, and Pod Label like so: Once you have that configured, click Save. Neat Stuff! Its value is not important for this tutorial, but it is very important when you are actually using Jenkins in production. through which you can continue accessing Jenkins. Deploy Jenkins. 1.4.6. quick form. This is our current recommended quickstart for Azure: Create Git Repository. $ helm upgrade jenkins-1632774650 jenkins/jenkins -f values.yaml, This is caused by script security settings that limit what functions the Groovy DSL can actually execute. Now, when browsing to any one of the Node IPs on port 32000, you will be able to access the Jenkins dashboard. Terraform code got the Job DONE! Youll need to check the nodes logs to see if this config applied correctly: With that changed, I upgrade the helm release again and my test job successfully ran! A typical Jenkins deployment consists of a controller node and, optionally, one or more agents. I decided to try and bring Jenkins up from a Helm chart, applied through Terraform and configured only through Jenkins Configuration-as-Code (JCasC). Quickstart - Jenkins (JCasC) in Kubernetes - Verifa Website In general, I recommend limiting the number of plugins you install as much as possible. alphanumeric password (between the 2 sets of asterisks). . Enter the This setup wizard takes you through a few quick "one-off" steps to unlock You can get that from the pod logs either from the Kubernetes dashboard or CLI. Hopefully, your build ran successfully. This week, we have evolved to learn all about Jenkins and Terraformlol. If the page does not automatically refresh after a minute, use your web Then, we run those commands to get the IP Jenkins can be reached at, which for me evaluates to http://192.168.65.4:30155/login. See part 2 for AWS/EKS here. The Terraform life cycle is a way to manage the creation, update, and deletion of infrastructure resources. If the pod gets deleted or restarted, the data will get persisted in the node volume. and underlying infrastructure are not overloaded. A Service for the Jenkins primary instance Deployment that exposes ports 8080 and 50000. The plan includes the resources that will be created, modified, or destroyed, as well as the actions that will be taken to make those changes. When deploying applications and services, configure Jenkins jobs to perform zero-downtime and blue-green deployments. Once you are logged back in, go to http://localhost:3000/configureClouds/. First, well bring you into our world through in depth technical articles, ground breaking statistical analysis and tales of epic and annual nerf wars. Local persistent volume based on local storage class that holds the Jenkins data path '/var/jenkins_home'. In Pipeline as Code, you will master: Building and deploying a Jenkins cluster from scratch Writing pipeline as code for cloud-native applications Automating the deployment of Dockerized and Serverless applications Containerizing applications with Docker and Kubernetes Deploying Jenkins on AWS, GCP and Azure Managing, securing and monitoring a . Helm CLI. This document describes the process of using Terraform to deploy Jenkins onto a Kubernetes cluster on the managed Kubernetes service of Google Cloud Platform (GCP), Google Kubernetes Engine (GKE). T: Its Declarative. When it comes to creating Jenkins jobs . Kubernetes (K8s) is an open-source system for automating deployment, scaling, and management of containerized applications. Pro tip: To run the examples in this post efficiently, I recommend opening up two shell instances. Kubernetes vs. Jenkins: Key Differences. The pods it brought up, called agents, run a different Docker container than the controller does, which brings me to the last section of this post. This will create a Jenkins primary instance Deployment from the jenkins/jenkins:lts Docker image with a replica count of one. Lets get that up and running in our cluster. What this ultimately provides us with is scalability and a clean workspace for each build (i.e. AKS container CI/CD with Jenkins and Kubernetes - Azure Architecture The easy option is just to turn that setting off, with the. I looked through the charts values and decided on a small set of my own values to start with: The last section (LOCAL ONLY) is there because my local Kubernetes cluster didnt have an ingress controller installed. Helm and Terraform are used to make the process simple, robust, and easy to repeat . Jenkins, customize it with plugins and create the first administrator user Here is my main.tf: Create 'service.yaml' and copy the following service manifest: Create the Jenkins service using kubectl. This example uses the Jenkins deployment pod name. When I deploy this to a real cluster, I remove this section and use the default ClusterIP type (which does not expose the service directly) and configure the ingress properly. That is not a good idea if your pipeline is open for editing by others, but here, everything will be controlled through code. There sure are roadblocks and troubleshooting encountered during this project, for one not understanding the Terraform syntax (still got a lot to learn) and misconfigure the resources like VPC, Aws instances. In your environment it might work as-is, but for me, I needed to hit http://localhost:30155/login, to load: Log in with my extra-secret password and: Not a bad start! T: Its Secure. Ideally, you should use a persistent volume using the available storage class with the cloud provider, or the one provided by the cluster administrator to persist data on node failures. jenkins installation is in the form of docker in docker which is on official documentation. This will create a Helm release named jenkins that contains all of the aforementioned default features. To apply the new configuration, upgrade the Helm release: This defines the job successfully, but I get a permission error when it actually executes: This is caused by script security settings that limit what functions the Groovy DSL can actually execute. How to connect to a minikube cluster using terraform on jenkins pipeline? making sure to clean up the file system by clearing up workspaces). terraform apply -var="key=value". Click Add Container > Container Template and use the following values: Run terraform init in the directory where you put 7-terraform-config.tf. ''' There are multiple ways to customize your job, including changing the agent image itself, but it might be easiest to bring up a second (or third, or fourth) container using an image of your choice. The service is accessed through the Node IP address and the service nodePort. Okay, lets create a simple Jenkins pipeline to make sure our Jenkins instance actually works. This post outlines a path to getting an enterprise-grade Jenkins instance up and running on Kubernetes. The variables needed to be passed to Terraform files can either be statically defined in ".tfvars" file or they can be set as env variables or as a switch (-var) with Terraform apply command. The apply command will only create or update resources that are not already present. The NodePort service type will bypass the ingress and just expose the service at a port directly. How to Setup Jenkins Build Agents on Kubernetes Pods - DevOpsCube To validate that creating the deployment was successful you can invoke: We have a Jenkins instance deployed but it is still not accessible. see official documentation of Jenkins Operator. We will create a service account called jenkins: A ClusterRole is a set of permissions that can be assigned to resources within a given cluster. The command: sudo cat /var/lib/jenkins/secrets/initialAdminPassword will print the password at console. What is Terraform | Terraform | HashiCorp Developer, https://developer.hashicorp.com/terraform/downloads, Docs overview | hashicorp/aws | Terraform Registry, https://senthilnayagan.com/assets/images/posts/terraform-lifecycle.png. This process may take a few Kubernetes makes sure that resources are used effectively and that your servers apiVersion: v1 Note that, for most use cases, youll want to configure Jenkins with an actual authentication system (and not a single administrator username/password), but I wont explore that in this post. Throughout this post, the commonly-used terms master and slave are substituted with primary and executor to be more inclusive. This will print out what is going to change in the cluster based on the configuration you have defined. Looks good! Both the Jenkins Controller and the Agents are defined as code; our Jenkins Controller using JCasC (Jenkins Configuration as Code), and our Jenkins Agents as part of our Declarative Pipelines. To get the admin password for your Jenkins instance, run printf $(kubectl get secret --namespace jenkins jenkins -o jsonpath="{.data.jenkins-admin-password}" | base64 --decode);echo. Enjoys solving challenging problems, building things, and playing gigs at bars around Chicago with his heavy metal band. Jenkins vs. Kubernetes: What Is the Difference? - phoenixNAP This will give you one more chance to make sure you want to apply your changes. This means that Kubernetes noticed a missing Pod and created a new one to return the Deployment to the right number of replicas. If you are not sure what plugins you need, choose. First, lets delete our existing helm release: helm delete jenkins. It shows that the Jenkins service is running, and that it is using the default configuration. #1: LEARN 6 DevOps Tools - Docker, Kubernetes, Azure DevOps, Jenkins, Terraform, and Ansible #2: LEARN 3 Different Clouds - AWS, Azure, and Google Cloud #3: ONE of the HIGHEST RATED DEVOPS courses (JUNE 2021) #4: IMPLEMENT DEVOPS with a HANDS-ON approach Architecture. the namespace they are running in. If required, log in to Jenkins with the credentials of the user you just So I created a minikube cluster on the same machine on which jenkins is installed. The deployment file uses local storage class persistent volume for Jenkins data. Create your infrastructure. Select the box next to the plugin named Kubernetes and click Download now and install after restart at the bottom of the page. Enjoy this tune Evolve on SoundCloud while you are reading the article. Whenever you trigger a Jenkins job, the Jenkins Kubernetes plugin will make an API call to create a Kubernetes agent pod. That doesnt actually load for me because the IP is wrong Im on OS X where Docker has to run containers inside a VM, so its returning the IP as the VM thats running the k8s pods sees it. It just defines a fragment of yaml text, again passed in plaintext with the pipe syntax, that will get used as the configuration-as-code. After a few minutes, you should have an enterprise-grade Jenkins up and running again! I want to use terraform to provision a kubernetes cluster on minikube. This official minikube doc explains which directories we can use to mount or data. spec: The backend configuration is used to store the Terraform state file, which contains information about the infrastructure that has been created or modified by Terraform. increased consistency across builds). Here's a how-to guide for building a CICD pipeline with Jenkins and Kubernetes. TL;DR. The above step is a recommended practice to store your secrets. Hosting Jenkins on a Kubernetes Cluster is beneficial for Kubernetes-based deployments and dynamic container-based scalable Jenkins agents. IaC creates and manages system resources through configuration files instead of manipulating hardware resources manually or with interactive tools. Deploy a basic standalone Jenkins primary instance via a Kubernetes Deployment. jenkins-sa.yaml. This post outlines a path to getting an enterprise-grade Jenkins instance up and running on Kubernetes. sh 'pwd' Once that Deployment is in a Ready state, we can forward a port to the container in our pod to see the Jenkins UI locally in our browser: kubectl port-forward deployment/jenkins-standalone-deployment 3000:8080. I appreciate your interest in the exciting field of cloud computing and look forward to continuing our journey together. If you enjoy working with Kubernetes or solving challenging problems. Deploying Jenkins on Kubernetes with Helm and Terraform - Innovation Kubernetes' ability to orchestrate container deployment ensures that Jenkins always If the Jenkins primary instance goes down, the volume holding its data will persist and attach to the new instance that Kubernetes schedules in the cluster. In your environment it might work as-is, but for me, I needed to hit. A Kubernetes cluster adds a new automation layer to Jenkins. If you run into any issues, please submit a pull request to that repo, and I will do my best to respond. ServiceAccounts, Roles, and RoleBindings) to give the primary instance Deployment the permissions it needs to launch executors. Kubernetes makes sure that resources are used effectively and that your servers and underlying infrastructure are not overloaded. References. Wait a few seconds for the plugin to download. If you find it helpful, go ahead and give it a star. terraform init. Get your 'admin' user password by running: Get the Jenkins URL to visit by running these commands in the same shell: Login with the password from step 1 and the username: admin. kind: Pod instead and if so, click Jenkins will ask for the initial Admin password when you access the dashboard for the first time. Now, lets test our release and make sure we can run builds. To do this, save the following configuration to your file system as 1-basic-rbac.yaml: Navigate to the folder containing that configuration on your file system and run the following command: kubectl apply -f 1-basic-rbac.yaml. It is a wonderful tool that helps us build and manage computer infrastructure by using a blueprint, just like building with LEGO pieces. I learn that it is a better practice is to use multiple files, each of which contains a specific type of resource or configuration. This is meant to be a starting point for you to build on and explore. You can grab that password quickly by running the following: kubectl exec -it deployment/jenkins-standalone-deployment -- cat /var/jenkins_home/secrets/initialAdminPassword. See the official chart for more details. SampathSivaKumar Boddeti on LinkedIn: #eks #kubernetes #argocd #gitops Helm is a package manager for Kubernetes and its package format is called a chart. This will allow you to manage changes to the chart over time and make sure you have more control over its lifecycle. built-in backup functionality) that we dont take advantage of here with the default chart configuration. setup wizard on new Jenkins installations before you can access Jenkinss main The instance will be assigned the Project4EC2 SSH key and will be tagged with the Name tag JenkinsTerraformInstance2023. Running Jenkins on Kubernetes In this article, I will take you through the steps required to setup and configure Jenkins on a Managed Kubernetes cluster such as AKS and running a simple pipeline with agent pods dynamically provisioned. Terraform and Jenkins: IaC from Your Build | CloudBees requests made to any node on this port to the Jenkins pod. Now, go to http://localhost:3000/restart and click Yes. Depending on your environment, it can take a bit of time for Jenkins to start up. It just defines a fragment of yaml text, again passed in plaintext with the pipe syntax, that will get used as the configuration-as-code. The last step is to execute the tf scripts in sequence. Hooray! Terraform is the infrastructure as code solution I see used most in industry, so lets use it here. What we have deployed is roughly the equivalent of a Jenkins instance deployed on a VM with ephemeral storage. That is not a good idea if your pipeline is open for editing by others, but here, everything will be controlled through code. As a response to the limitations of the current Kubernetes provider the Hashicorp team recently released an alpha version of a new provider. Go to http://localhost:3000/pluginManager/available and search Kubernetes in the search box. By default, out of the box, this helm chart provides us with: Sounds a lot more robust than what we just built ourselves, doesnt it? Important Note: Replace 'worker-node01' with any one of your cluster worker nodes hostname. It could be a patching activity or a downscaling activity. The following code provided defines two resources: an AWS EC2 instance and an AWS S3 bucket. We have now created a deployment. To do so, save the following to a file named 6-helm-values.yaml: Now we are good to deploy Jenkins using Helm. For the purposes of brevity, we will just focus on a few key elements of reliability and operational excellence in this post, namely high availability, data durability, scalability, and management of configuration and infrastructure as code.
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