Kubernetes Gatekeeper is a popular open-source tool that enforces admission policies on Kubernetes clusters. It provides a declarative way to define and enforce policies for objects created or updated in a cluster. While Gatekeeper is a useful tool, it may not be the right fit for every organization.
In this article, we will explore some Kubernetes Gatekeeper alternatives that you can use to enforce policies on your Kubernetes clusters.
- OPA Gatekeeper
OPA Gatekeeper is an open-source tool that provides policy enforcement capabilities for Kubernetes clusters. It is built on top of the Open Policy Agent (OPA), a popular policy engine used in the industry. OPA Gatekeeper enables you to write policies in Rego, a declarative language used to express policies, and enforce them on Kubernetes objects.
To use OPA Gatekeeper, you need to install it on your Kubernetes cluster. You can follow these steps:
- Clone the OPA Gatekeeper repository:
git clone https://github.com/open-policy-agent/gatekeeper.git - Install the Gatekeeper CRDs:
kubectl apply -f gatekeeper/deploy/gatekeeper.yaml - Install the Gatekeeper controller:
kubectl apply -f gatekeeper/deploy/gatekeeper-mutation.yaml
Once installed, you can define your policies using the Gatekeeper CRDs and apply them to your Kubernetes objects. For example, you can define a policy that enforces that all Pods in a namespace have a specific label.
- Kyverno
Kyverno is a Kubernetes-native policy engine that provides policy enforcement capabilities for Kubernetes clusters. It allows you to define policies using YAML files and apply them to your Kubernetes objects. Kyverno supports a wide range of policies, including PodSecurityPolicies, NetworkPolicies, and ResourceQuotas.
To use Kyverno, you need to install it on your Kubernetes cluster. You can follow these steps:
- Install Kyverno using Helm:
helm repo add kyverno https://kyverno.github.io/kyverno/ && helm repo update && helm install kyverno/kyverno --namespace kyverno --create-namespace
Once installed, you can define your policies using YAML files and apply them to your Kubernetes objects. For example, you can define a policy that enforces that all Deployments have a specific label.
- Conftest
Conftest is an open-source tool that enables you to test your Kubernetes configuration files against a set of policies. It provides a way to write policies using Rego and test them against your Kubernetes objects. Conftest can be used as part of a CI/CD pipeline to ensure that your Kubernetes objects adhere to a specific set of policies.
To use Conftest, you need to install it on your local machine or your Kubernetes cluster. You can follow these steps:
- Download the Conftest binary for your platform:
https://github.com/instrumenta/conftest/releases - Add the Conftest binary to your PATH
- Write policies using Rego
- Test your Kubernetes objects against the policies:
conftest test <path-to-kubernetes-objects>
Kubernetes Gatekeeper is a popular tool for policy enforcement on Kubernetes clusters, but it may not be the right fit for every organization. In this article, we explored some Kubernetes Gatekeeper alternatives that you can use to enforce policies on your Kubernetes clusters.
OPA Gatekeeper, Kyverno, and Conftest are all open-source tools that provide policy enforcement capabilities for Kubernetes clusters. Choose the tool that best fits your organization's needs and start enforcing policies on your Kubernetes clusters today.
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