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autoclean-k8s

A Babashka script to clean up Kubernetes resources associated with deleted Git branches.

Overview

This tool helps maintain clean Kubernetes clusters by automatically (it could be used from a CI pipeline) removing resources (deployments, statefulsets, services, ingresses) that were created for Git branches that no longer exist.

It works by:

  1. Checking Git repositories for existing branches
  2. Comparing with deployed resources in Kubernetes
  3. Cleaning up resources that correspond to deleted branches (assuming proper annotations and labels have already been set on kubernetes resources)

Prerequisites

  • Babashka
  • kubectl with access to your cluster
  • git command line tool
  • jq command line tool (might be removed later)

Installation

  1. Clone this repository
  2. Make the script executable:
chmod u+x autoclean.bb

Configuration

Create a configuration file in EDN format at ~/.config/autoclean-k8s/config.edn:

{:repos 
  {"app1"
    {:repo "[email protected]:org/app1.git"
     :namespace "apps"
     :labelselector {:get ["app=myapp"]
                    :delete {:labels ["app=myapp"]
                            :branch-label "branch"}}
     :branch-annotation "gitbranch"
     :resource-types ["deployments.apps" "statefulsets.apps"]
     :branchprefix ""}}}

Configuration options:

  • repo: Git SSH URL
  • namespace: Kubernetes namespace
  • labelselector.get: Labels to identify resources to check
  • labelselector.delete: Labels for resources to delete
    • labels: Base labels for resources
    • branch-label: Label key containing branch name
  • branch-annotation: Annotation key containing Git branch name
  • resource-types: Types of Kubernetes resources to check
  • branchprefix: Optional prefix added to branch names

Usage

Run in simulation mode (default, no deletions):

./autoclean.bb

Run with actual deletions:

./autoclean.bb --simulation false

Use custom config file:

./autoclean.bb --config /path/to/config.edn

How it Works

  1. For each repository in the config:

    • Clones/updates the Git repository
    • Gets list of current branches
    • Checks Kubernetes resources matching configured labels
    • Identifies resources using branches that no longer exist
    • Deletes matching resources (deployments, statefulsets, services, ingresses)

  2. Resources are identified using:

    • Namespace
    • Label selectors
    • Branch name (from annotation)

  3. Deletion is performed using kubectl with label selectors

Safety Features

  • Simulation mode enabled by default
  • Detailed logging of all operations
  • Confirmation of deletions in logs
  • Resource timeout limits
  • Error handling with descriptive messages

Contributing

Pull requests are welcome. For major changes, please open an issue first to discuss what you would like to change.

License

GPL3