Kubent: A Tool to Detect Deprecated APIs in Kubernetes

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Welcome to an exploration of Kubent, an invaluable tool in the realm of Kubernetes. In this blog post, we will delve into the capabilities of Kubent and its role in simplifying the management of Kubernetes clusters. Whether you are a seasoned developer or a curious newcomer, join us on this informative journey as we uncover the benefits and features of Kubent.

An Introduction to Kubent

Kubent, an abbreviation for “Kube No Trouble,” is a user-friendly tool designed to assist users in ensuring API version compatibility within their Kubernetes clusters. Before we explore the importance of upgrading API versions, let’s take a moment to familiarize ourselves with the core features and functionalities of Kubent. With Kubent, you can expect:

Upgrading the API Version in Kubernetes

Upgrading the API version in Kubernetes is crucial for several reasons:

How To Install

To install kubent simply run the following command. This will download the latest kubent version and put it under the /usr/local/bin directory.

$ sh -c "$(curl -sSL https://git.io/install-kubent)"

Kubent is also available as a docker image:

$ docker run -it --rm \
  -v "${HOME}/.kube/config:/.kubeconfig" \
  ghcr.io/doitintl/kube-no-trouble:latest \
  -k /.kubeconfig

How To Run It

Once installed and configured, run the following command to execute Kubent:

$ kubent

This is an example of the outcome:

6:25PM INF >>> Kube No Trouble `kubent` <<<
6:25PM INF Initializing collectors and retrieving data
6:25PM INF Retrieved 103 resources from collector name=Cluster
6:25PM INF Retrieved 0 resources from collector name="Helm v3"
6:25PM INF Loaded ruleset name=deprecated-1-16.rego
6:25PM INF Loaded ruleset name=deprecated-1-20.rego
>>> 1.16 Deprecated APIs <<<
KIND         NAMESPACE     NAME                    API_VERSION
Deployment   default       nginx-deployment-old    apps/v1beta1
Deployment   kube-system   event-exporter-v0.2.5   apps/v1beta1
Deployment   kube-system   k8s-snapshots           extensions/v1beta1
Deployment   kube-system   kube-dns                extensions/v1beta1
>>> 1.20 Deprecated APIs <<<
Ingress   default     test-ingress   extensions/v1beta1


Kubent emerges as a reliable tool for simplifying Kubernetes cluster management, specifically in terms of issue detection and API version compatibility checks. Its seamless integration with Kubectl, comprehensive analysis capabilities, and insightful reporting make it a valuable asset for both newcomers and experienced administrators in the Kubernetes ecosystem. However, it’s important to note that while Kubent streamlines the process of identifying calls to deprecated API endpoints, it does not provide automatic solutions or perform corrective actions. It serves as a powerful tool that empowers you to make informed decisions and take necessary steps to maintain a healthy and up-to-date Kubernetes environment.