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EC2 Crowdstrike Repair (EXPERIMENTAL, NEEDS TESTERS)

This Terraform configuration sets up an Auto Scaling Group (ASG) that runs a PowerShell script to repair unhealthy EC2 instances across all Availability Zones in the current AWS region.

Features

  • Launches instances across all available Availability Zones in an ASG, with a single instance per AZ.
  • Each instance runs a custom PowerShell repair script, that iterates over all unhealthy instance form the current AZ:
  1. detaches the root volume from the current unhealthy instance.
  2. attaches it to the current instance.
  3. attempts to delete the broken CrowdStrike update file.
  4. detaches and re-attaches the volume to the initial instance.
  5. restarts the initial instance.

Prerequisites

  • Terraform installed (version 0.12 or later)

Usage

  1. Clone this repository

  2. Initialize the Terraform working directory:

    terraform init

  3. Review the planned changes:

    terraform plan

  4. Apply the Terraform configuration:

    terraform apply

  5. Confirm the changes by typing yes when prompted.

Customization

  • To use a different Windows Server version, modify the name parameter in the aws_ssm_parameter data source.
  • Adjust the instance_type in the launch template if you need more powerful instances.
  • Modify the min_size, max_size, and desired_capacity in the ASG resource if you want a different scaling behavior.

Clean Up

To remove all created resources:

terraform destroy

Contributing

Feel free to submit issues or pull requests if you have suggestions for improvements or bug fixes.

License

This code is (C) 2024 Cristian Magherusan-Stanciu, and released under the MIT license.

Check out more of our OSS repos at LeanerCloud.com.