How to Clean Up AWS VPC Resources

When deleting AWS VPCs, dependent network resources are sometimes left behind.

Resoto's cleanup_aws_vpcs plugin can find and delete these orphaned resources, which include:

• AWS VPC Peering Connections
• AWS EC2 Network ACLs
• AWS EC2 Network Interfaces
• AWS ELB
• AWS ALB
• AWS ALB Target Groups
• AWS EC2 Subnets
• AWS EC2 Security Groups
• AWS EC2 Internet Gateways
• AWS EC2 NAT Gateways
• AWS EC2 Route Tables

Prerequisites

This guide assumes that you have already installed and configured Resoto to collect your AWS resources.

Directions

1. Execute the following command in Resoto Shell to open the Resoto Worker configuration for editing:

   > config edit resoto.worker

2. Enable cleanup by modifying the resotoworker section of the configuration as follows:

   resotoworker:
     # Enable cleanup of resources
     cleanup: true
     # Do not actually cleanup resources, just create log messages
     cleanup_dry_run: false
     # How many cleanup threads to run in parallel
     cleanup_pool_size: 16

   When cleanup is enabled, marked resources will be deleted as a part of the collect_and_cleanup workflow, which runs each hour by default.

   tip

   Set cleanup_dry_run to true to simulate cleanup without actually deleting resources.

3. Update the plugin_cleanup_aws_vpcs section with the desired target cloud account IDs and setting the enabled property to true:

   cleanup_aws_vpcs plugin configuration

   plugin_cleanup_aws_vpcs:
     # Dictionary of key cloud with list of account IDs for which the plugin should be active as value
     config:
       aws:
         - '1234567'
         - '567890'
     # Enable plugin?
     enabled: true

The plugin will now run each time Resoto emits the post_cleanup_plan event. The post_cleanup_plan event is emitted in the cleanup phase of the collect_and_cleanup workflow.

Each time the cleanup_aws_vpcs plugin runs, network resources associated with VPCs that have been deleted or marked for cleanup will also be flagged for removal during the next cleanup run.

Further Reading

• cleanup_aws_vpcs Plugin
• Resource Cleanup
• Cloud Data Sync
• Configuration
• Command-Line Interface