Training VM

EC2 instances pre-configured with training tools, one per student.

Pre-installed tools

• AWS CLI v2
• kubectl
• OpenTofu
• gotemplate
• Docker
• Claude Code CLI
• Nullplatform CLI

Requirements

• OpenTofu >= 1.6
• AWS credentials configured
• Students' SSH public keys

Usage

1. Initialize

tofu init

2. Add students

Edit terraform.tfvars and add each student with their SSH public key:

students = {
  agustin = {
    ssh_public_key = "ssh-ed25519 AAAA... agustin@email.com"
  }
  maria = {
    ssh_public_key = "ssh-ed25519 AAAA... maria@email.com"
  }
  juan = {
    ssh_public_key = "ssh-rsa AAAA... juan@email.com"
  }
}

Each student needs to provide their public key. They can get it with:

cat ~/.ssh/id_ed25519.pub
# or
cat ~/.ssh/id_rsa.pub

3. Deploy

tofu plan    # review what will be created
tofu apply   # create the instances

The output shows the SSH command for each student:

student_connections = {
  agustin = { public_ip = "3.x.x.x", ssh_command = "ssh ubuntu@3.x.x.x" }
  maria   = { public_ip = "3.x.x.y", ssh_command = "ssh ubuntu@3.x.x.y" }
}

4. Connect

Each student connects with:

ssh ubuntu@<their-ip>

Tools are ready after ~3 minutes (cloud-init runs on first boot). Check progress with:

tail -f /var/log/cloud-init-output.log

5. Cleanup

tofu destroy