Namshi Coding Challenge

Problem Statement

• To write terraform code to launch single node kubernetes cluster using terraform and ansible.

Setup

• Install prerequisites.
  • Terraform
• Clone repo. [https://github.com/jyotibhanot30/namshi-coding-challenge.git]
• Fill in variables.tf
  • aws_access_key
  • aws_secret_key
  • key_name
  • aws_region
• Launch one master and one worker node with Terraform.
  • Kubernetes components are installed using Ansible.
  • Ansible playbook run is done through userdata.
• Create cluster join command on master.
  • kubeadm token create --print-join-command
• Run cluster join command on worker.

Commands:

• On local Linux System:

  • wget https://releases.hashicorp.com/terraform/0.12.3/terraform_0.12.3_linux_amd64.zip
  • sudo apt-get install git unzip
  • unzip terraform_0.12.3_linux_amd64.zip
  • mv terraform /usr/local/bin
  • terraform --version
  • git clone https://github.com/jyotibhanot30/namshi-coding-challenge.git
  • cd namshi-coding-challenge/terraform/ec2-terraform
  • terraform init
  • terraform plan
  • terraform apply

• Terraform Output gives us:

  1. Master IP
  2. Worker IP
  3. Key Name
  4. SSH User

• On Master

  • kubectl get nodes --all-namespaces
  • kubeadm token create --print-join-command [Copy the join-command]

• On Worker [Run join-command with sudo]

Cluster Validation Command:

• On Master
  • kubectl get nodes --all-namspaces
    • [Should output master and workes status as Ready]

Package Versions:

• Terraform: v0.12.3
• Ansible: 2.7.10

Further Scope:

• Terraform state files can be stored in S3 bucket.
• Output of kubeadm token create command can be moved to SQS which would be the single source of the join command for all worker nodes.