Deploying Jenkins Master and Worker Nodes in AWS Behind an ALB Using Terraform and Ansible

1. Find the details for logging in to the Terraform Controller node provided by the hands-on lab interface and log in to the node using SSH:

   ssh cloud_user@<IP-OF-TERRAFORM-CONTROLLER>
   

   Note: This instance already has an EC2 instance profile (role) attached to it and has all necessary AWS API permissions required for this lab. It also has the AWS CLI set up and configured with the AWS account attached to this lab, for which the console login credentials are also provided in the lab interface page once the lab spins up.

2. After logging in, verify the version of Terraform installed (should be 12.13). Execute the following command to check:

   terraform version
   

Use the git command to clone the GitHub repo which has the Terraform code for deploying the solution of this lab. GitHub repo URL.

1. Execute the following command:

   git clone https://github.com/ACloudGuru-Resources/content-deploying-to-aws-ansible-terraform.git
   

2. Change to the directory for lab Terraform code:

   cd content-deploying-to-aws-ansible-terraform/lab_jenkins_master_worker
   

3. Examine the contents of the directory you're in:

   ls
   

1. Run the Ansible Playbook:

   ansible-playbook ansible_templates/gen_ssh_key.yaml
   

   This Ansible Playbook will generate an SSH key pair for you user cloud_user which is required for deploying EC2 key pairs in our code.

   Note: Alternatively, you may also run the following Linux command to do the same:

   ssh-keygen -t rsa
   

   When this command prompts for input, keep pressing enter until you're returned to the prompt. Do not enter a passphrase.

1. Initialize the Terraform directory you changed into to download the required provider

   terraform init
   

2. Ensure Terraform code is formatted properly:

   terraform fmt
   

3. Ensure code has proper syntax and no errors:

   terraform validate
   

4. See the execution plan and note the number of resources that will be created:

   terraform plan
   

   Enter yes when prompted.

5. Deploy resources:

   terraform apply
   

   Enter yes when prompted.

   After terraform apply has run successfully, you can either use the AWS CLI on the Controller node to list and describe created resources or you can log in to the AWS Console to verify and investigate created resources.

6. After a successful terraform apply, you will get the DNS URL of the ALB. Test it out to see if you can reach your Jenkins deployment.

   Jenkins credentials:

   • username: admin
   • password: password

7. Finally, on the Terraform Controller node CLI, delete all resources which were created and ensure that it runs through successfully.

   terraform destroy