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Project Name: End to end deployment of Application to Kubernetes using a Jenkins CI/CD Pipeline and Terraform

Steps for the project

This project consist of setting up a CICD pipeline using Jenkins to provision AWS VPC and jenkins EC2 server and a kubernetes cluster in which our testapp will be deployed to using terraform (IaC tool). feel free to clone this repository, contribute to this project and comment. We can either use terraform commands manually to provision our servers and resources or use a configure a jenkins job to run and provision the resources and deploy our application automatically. If not, use the aws configure command (to use this command, ensure aws-cli is installed on your local machine) use this links below to install aws-cli and terraform:

https://docs.aws.amazon.com/cli/latest/userguide/cli-chap-welcome.html

https://developer.hashicorp.com/terraform/tutorials/aws-get-started/install-cli

1. Create a Keypair that matches your keypair

Login to your AWS console and navigate to EC2 Dashboard and create a keypair tobe used to connect to our jenkins server. Make sure to rename the keypair in main.tf file under the aws_instance resource section to match the keypair you just created. Create an S3 buckeck and rename the s3 bucket name in "backend.tf" file found in the terraform folder in our repository. We used S3 to securely store our terraform state file which is crucial to the terraform stack.

jenkins-pipeline-deploy-to-eks

This pipeline uses terraform to provision resources in aws cloud and automatically setup our jenkins server using the "jenkins-server.sh script found in the terraform folder in our directory". We can change into the terraform directory in our root folder and use the terraform init, terraform validate and terraform plan commands to see the resources that will be provisioned. We assume that your AWS_ACCESS_KEY_ID and AWS_SECRET_KEY and REGION have been configured.

aws configure

While in the terraform directory, we initialize terraform using the terraform init command.

terraform init

Use the terraform validate command to validate our HL synthax and structure of our resources to be provision

terraform validate

To view the resources to be pprovisioned, use the terraform plan command.

terraform plan

Use terraform apply command to apply the resources creation.

terraform apply

Our jenkins server public IP will be displayed on screen when terraform complets the resource creation. Use it to login to our server and grap the admin password using the following command.

sudo cat /var/lib/jenkins/secrets/initialAdminPassword

Provision eks-cluster for our testapp deployment. NB: We're required to ssh into our jenkins serveer to obtain our admin password as well as setup a jenkins pipeline and installing necessary plugins to run using the Jenkinsfile in our root repository. Our jenkins pipeline will pull our code from github repository and Do dependency checks, scan vulnerability and quality gates and build docker image using Dockerfile in our repository and push it to dockerhub. Be sure to configure your jenkins aws and dockerhub credentials in our jenkins server.

2. Create a Jenkins Server with all the dependencies, libraries and packagies needed.

2. Once completed, access the Jenkins server and Set it up

Use Jenkins credentials under "Manage Jenkins" to setup our aws_access_key_id and aws_secret_key on jenkins. This credentials are necessary and are used as environment variables in our Jenkins files. Use the exact match as found in the Jenkins files. Configure necessary credentials and install plugins on our jenkins server.

4. Run the jenkins-pipeline-deploy-to-eks to create Kubernetes Cluster, create deployments and Services

Note:

A. If you initially used terraform init, plan and apply commands to provission resources at the beginning of this project, use the "Jenkinsfile2" to deploy to our EKS cluster skipping the steps of attemting to provission resources that already exist.

B. If you already have your jenkins server setup and and wish to provission just the EKS cluster and deploy using Jenkins Pipeline, use "Jenkinsfile1" in your pipeline.

5. Test the application.

Access our application using the loadbalancer endpoint on our eks-cluster. Navigate to EC2 Dashboard and select Load Balancers, you should see the one created by the application in our EKS cluster. Use the Load Balancer's endpoint to access our application. NB: You can use Route53 to point a Cname records and domain to the your desire website dns if you're planning to use this project as a starting point for your production Workload.

6. Destroy infrastructure

tear down all resources provision by using terraform to avoid unnecessary charges using the terraform destroy command

terraform destroy --auto-approve

7. This step explains Jenkinsfille3 and how to use it

If you wish to use the "src" folder containing HTML, CSS and JavaScript template downloaded freely from https://www.free-css.com/free-css-templates. Use Jenkinsfile3 and set up a separate job. This will use the Dockerfile to build a docker image of the src content using ngin:latest as based image. The pipeline consist of pulling code from github repository, running Dependency Checks, building a docker image and pushing it to dockerhub registry. Make sure you configure your github credentials in jenkins as used in the environment variable in the jenkinsfile3, install Dependency Check plugin using plugin manager on jenkins. Set a webhook from github to jenkins to automate the pipeline when changes are pushed to our repository or use use a Chrone Expression to periodically check out the gihub repository for code changes.

link https://medium.com/@desmondotutu93

Happy coding!!!

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