Kor - Kubernetes Orphaned Resources Finder

Kor is a tool to discover unused Kubernetes resources. Currently, Kor can identify and list unused:

• ConfigMaps
• Secrets.
• Services
• ServiceAccounts
• Deployments
• Statefulsets
• Roles
• Hpas
• Pvcs
• Ingresses
• Pdbs

Installation

Download the binary for your operating system from the releases page and add it to your system's PATH.

For MacOS users, you can install Kor using Homebrew:

brew install kor

Usage

Kor provides various subcommands to identify and list unused resources. The available commands are:

• all: Gets all unused resources for the specified namespace or all namespaces.
• configmap: Gets unused configmaps for the specified namespace or all namespaces.
• secret: Gets unused secrets for the specified namespace or all namespaces.
• services: Gets unused services for the specified namespace or all namespaces.
• serviceaccount: Gets unused service accounts for the specified namespace or all namespaces.
• deployments: Gets unused service accounts for the specified namespace or all namespaces.
• statefulsets: Gets unused service accounts for the specified namespace or all namespaces.
• role: Gets unused roles for the specified namespace or all namespaces.
• hps: Gets unused hpa for the specified namespace or all namespaces.
• pvc: Gets unused pvcs for the specified namespace or all namespaces.
• ingress: Gets unused ingresses for the specified namespace or all namespaces.
• pdb: Gets unused pdbs for the specified namespace or all namespaces.

Supported Flags

-h, --help                help for role
-k, --kubeconfig string   Path to kubeconfig file (optional)
-n, --namespace string    Namespace to run on
--output string       Output format (table or json) (default "table")

To use a specific subcommand, run kor [subcommand] [flags].

kor all --namespace my-namespace

For more information about each subcommand and its available flags, you can use the --help flag.

kor [subcommand] --help

Supported resources and limitations

Resource	What it looks for	Known False Positives ⚠️
Configmaps	Configmaps not used in the following places: - Pods - Containers - Configmaps used through volumes - Configmaps used through environment variables	Configmaps used by resources which don't explicitly state them in the config. e.g Grafana dashboards loaded dynamically opa policies fluentd configs
Secrets	Secrets not used in the following places: - Pods - Containers - Secrets used through volumes - Secrets used through environment variables - Secrets used by ingress TLS -Secrets used by ServiceAccounts	Secrets used by resources which don't explicitly state them in the config
Services	Services with no endpoints
Deployments	Deployments with 0 Replicas
ServiceAccounts	ServiceAccounts unused by pods ServiceAccounts unused by roleBinding or clusterRoleBinding
Statefulsets	Statefulsets with 0 Replicas
Roles	Roles not used in roleBinding
Pvcs	Pvcs not used in pods
Ingresses	Ingresses not pointing at any service.
Hpas	Hpas not used in Deployments Hpas not used in Statefulsets
Pdbs	Pdbs not used in Deployments Pdbs not used in Statefulsets

Import Option

You can also use kor as a Go library to programmatically discover unused resources. By importing the github.com/yonahd/kor/pkg/kor package, you can call the relevant functions to retrieve unused resources. The library provides the option to get the results in JSON format by specifying the outputFormat parameter.

import (
"github.com/yonahd/kor/pkg/kor"
)

func main() {
namespace := "my-namespace"
outputFormat := "json" // Set to "json" for JSON output

    if outputFormat == "json" {
        jsonResponse, err := kor.GetUnusedDeploymentsJSON(namespace, kubeconfig)
        if err != nil {
            // Handle error
        }
        // Process the JSON response
        // ...
    } else {
        kor.GetUnusedDeployments(namespace)
    }
}

Contributing

Contributions are welcome! If you encounter any bugs or have suggestions for improvements, please open an issue in the issue tracker.

License

This project is open-source and available under the MIT License. Feel free to use, modify, and distribute it as per the terms of the license.