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# kube-stale-resources
This is a utility to detect stale resources in [Kubernetes](https://kubernetes.io/) clusters between resources from YAML manifests supplied via local file or stdin (target state) and a Kubernetes cluster (live state).
All resources that exist in the live state but not in the target state are considered *stale* as they deviate from the intended state of the Kubernetes cluster (closed world assumption). It is intended as a complement to [kubectl diff](https://kubernetes.io/blog/2019/01/14/apiserver-dry-run-and-kubectl-diff/).
Using a blacklist you can ignore resources from the live state from the comparison so they are not considered *stale* even though they do not exist in the given target state. This is useful when those resources are created by Kubernetes itself (e.g. the `kubernetes` service in the default namespace), managed by the Kubernetes cluster provider or another tool outside the scope.
A use case for `kube-stale-resources` is using it alongside `kubectl diff` on locally present YAML manifests so `kubectl diff` can detect newly created Kubernetes resources and changes to those resources and `kube-stale-resources` can alert the user on stale resources that should be deleted from the cluster.
Limitations:
- currently only works on namespaced resources
- currently requires explicit `metadata.namespace` field even for resources in default namespace
- requires unauthenticated HTTP(S) access to Kubernetes apiserver, e.g. via `kubectl proxy`
- only accounts for `apiVersion` deprecations up until Kubernetes 1.16
## Usage
You need Python 3.8 or higher.
Assuming you have a properly setup `.kube/config` (e.g. using [minikube](https://github.com/kubernetes/minikube) after a successful `minikube start`) running:
```bash
kubectl proxy &
# ignore minikube resources
cat <<EOF > blacklist.txt
^kubernetes-dashboard:.*$
^default:events.k8s.io/v1beta1:Event:minikube..*$
EOF
# orderly created resource using YAML manifest in e.g. git
cat <<EOF > version-controlled-resources.yml
---
apiVersion: v1
kind: Service
metadata:
name: foo
namespace: default
spec:
type: ClusterIP
ports:
- port: 80
name: http
targetPort: 80
selector:
app: foo
EOF
kubectl apply -f version-controlled-resources.yml
# on-the-fly created resource using imperative command
kubectl create service clusterip bar --tcp='8080:8080'
cat version-controlled-resources.yml | python kube-stale-resources.py -f - --blacklist blacklist.txt
```
This should yield a similar output to as we ignored what minikube sets up by default (e.g. the whole `kubernetes-dashboard` namespace):
```
Reading blacklist file blacklist.txt...
Retrieving target state...
Retrieving live state from http://localhost:8001...
Live dynamic configmaps that are not in target (stale):
.. 0 entries
Live resources w/o dynamic configmaps that are not in target (stale):
default:v1:Service:bar
.. 1 entries
```
Run `python kube-stale-resources.py -h` for full list of options.
## Blacklisting
Example blacklist file for a cluster on [GKE](https://cloud.google.com/kubernetes-engine/) that also uses [cert-manager](https://github.com/jetstack/cert-manager):
```
^.*:v1:ResourceQuota:gke-resource-quotas$
^default:v1:LimitRange:limits$
^.*:certmanager.k8s.io/v1alpha1:Order:.*$
```
In general a blacklist file contains one regular expression per line that are matched against a string of format `<namespace-name>:<apiVersion>:<kind>:<resource-name>` for each resource.
## License
kube-stale-resources is licensed under the Apache License, Version 2.0. See [LICENSE](LICENSE) for more information

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#!/usr/bin/env python
import argparse
import re
import sys
import requests
import yaml
from typing import (List, Any, Dict, Tuple, IO)
K8sResourceIdentifier = Tuple[str, str, str, str]
HEADERS = {"Content-Type": "application/json"}
BLACKLIST_REGEXS = [
# Kubernetes inherent blacklist (should apply to every k8s cluster out there)
r'^.*:apps/v1:ControllerRevision:.*$',
r'^.*:apps/v1:ReplicaSet:.*$',
r'^.*:batch/v1:Job:.*-\d{10,}$', # jobs created by cron jobs with unix timestamp suffix
r'^.*:metrics.k8s.io/v1beta1:PodMetrics:.*$',
r'^.*:v1:Endpoints:.*$',
r'^.*:v1:Event:.*$',
r'^.*:v1:Pod:.*$',
r'^.*:v1:Secret:.*-token-\S{5}$', # secrets with token for service accounts
r'^.*:v1:ServiceAccount:default$',
r'^default:v1:Service:kubernetes$',
r'^kube-node-lease:.*$',
r'^kube-public:.*$',
r'^kube-system:.*$',
# GKE specific parts (should apply to every GKE-managed k8s cluster)
# '^.*:v1:ResourceQuota:gke-resource-quotas$',
# '^default:v1:LimitRange:limits$,
]
def get_live_namespaced_resources(url: str) -> List[K8sResourceIdentifier]:
result = []
# merges https://kubernetes.io/docs/reference/using-api/#api-groups
# legacy API group
apiVersions = requests.get(url + '/api', headers=HEADERS).json()['versions']
for apiVersion in apiVersions:
apiResources = requests.get(url + '/api/' + apiVersion, headers=HEADERS).json()['resources']
for apiResource in apiResources:
if not ('list' in apiResource['verbs'] and apiResource['namespaced']):
continue
items = requests.get(url + '/api/' + apiVersion + '/' + apiResource['name'],
headers=HEADERS).json()['items']
for item in items:
result.append(
(item['metadata']['namespace'], apiVersion, apiResource['kind'], item['metadata']['name']))
# named API groups
apiGroups = requests.get(url + '/apis', headers=HEADERS).json()['groups']
for apiGroup in apiGroups:
apiResources = requests.get(url + '/apis/' + apiGroup['preferredVersion']['groupVersion'],
headers=HEADERS).json()['resources']
for apiResource in apiResources:
if not ('list' in apiResource['verbs'] and apiResource['namespaced']):
continue
if apiGroup['preferredVersion']['groupVersion'] == 'extensions/v1beta1' and apiResource['kind'] != 'Ingress':
# everything else in extensions/v1beta1 should be migrated to the preferred version
# except ingresses, see https://kubernetes.io/blog/2019/07/18/api-deprecations-in-1-16/
continue
items = requests.get(url + '/apis/' + apiGroup['preferredVersion']['groupVersion'] + '/' +
apiResource['name'],
headers=HEADERS).json()['items']
for item in items:
result.append((item['metadata']['namespace'], apiGroup['preferredVersion']['groupVersion'],
apiResource['kind'], item['metadata']['name']))
return result
def get_target_namespaced_resources(stream: IO) -> List[K8sResourceIdentifier]:
result = []
target_documents = list(yaml.load_all(stream, Loader=yaml.SafeLoader))
for document in target_documents:
if not document:
continue
if not 'namespace' in document['metadata']:
continue
result.append(
(document['metadata']['namespace'], document['apiVersion'], document['kind'], document['metadata']['name']))
return result
def get_compact_resource_identifiers(tuples: List[K8sResourceIdentifier]) -> List[str]:
return [namespace + ':' + apiVersion + ':' + kind + ':' + name for namespace, apiVersion, kind, name in tuples]
if __name__ == "__main__":
parser = argparse.ArgumentParser(description='Utility to detect k8s configuration drift.')
parser.add_argument('-f',
dest='target_manifests_file',
required=True,
help='File path (or - for stdin) to read Kubernetes manifests from for target state.')
parser.add_argument('--url',
dest='k8s_apiserver_url',
default='http://localhost:8001',
help='URL of Kubernetes apiserver to retrieve live state.')
parser.add_argument('--blacklist',
dest='blacklist_file',
help='File path to read blacklist regex entries from that will be used to filter live state.')
args = parser.parse_args()
blacklist_regexs = []
blacklist_regexs += BLACKLIST_REGEXS
if args.blacklist_file:
print(f'Reading blacklist file {args.blacklist_file}...')
with open(args.blacklist_file, 'r') as f:
blacklist_regexs += filter(lambda x: not re.match(r'^\s*$', x), f.read().split('\n'))
print('Retrieving target state...')
if args.target_manifests_file == '-':
target_tuples = get_target_namespaced_resources(sys.stdin)
else:
with open(args.target_manifests_file, 'r') as f:
target_tuples = get_target_namespaced_resources(f)
print(f'Retrieving live state from {args.k8s_apiserver_url}...')
raw_live_strings = get_compact_resource_identifiers(get_live_namespaced_resources(args.k8s_apiserver_url))
live_strings = list(filter(lambda s: not re.match('|'.join(blacklist_regexs), s), raw_live_strings))
starget = set(get_compact_resource_identifiers(target_tuples))
slive = set(live_strings)
print('Live dynamic configmaps that are not in target (stale):')
counter = 0
for x in sorted(list(slive - starget)):
if re.match('^.*:v1:ConfigMap:.*-[a-z0-9]{10}', x):
counter += 1
print(' ' + x)
print("..", counter, "entries")
print()
print('Live resources w/o dynamic configmaps that are not in target (stale):')
counter = 0
for x in sorted(list(slive - starget)):
if not re.match('^.*:v1:ConfigMap:.*-[a-z0-9]{10}', x):
counter += 1
print(' ' + x)
print("..", counter, "entries")