How Datree Secures Your Kubernetes Configurations: A Hands‑On Guide

What is Datree?

It is an open‑source CLI utility that prevents misconfigurations of Kubernetes workloads and SaaS platforms by managing policies. It validates your Kubernetes YAML files.

Why use Datree?

It helps owners and developers enforce policy execution, automatically checks for rule violations, and does not require a connection to a production cluster. Policies and rules can be applied from the online Datree dashboard.

How does Datree work?

Checks that the YAML file is syntactically correct.

Validates the Kubernetes version against the schema.

Runs policy checks such as memory limits, CPU limits, or any custom policy.

Provides a summary of the YAML file after applying Datree policies.

Quickly try Datree

Install Datree following the official documentation.

Example deployment.yaml for an Nginx deployment:

apiVersion: apps/v1
kind: Deployment
metadata:
  name: nginx-deployment
spec:
  selector:
    matchLabels:
      app: nginx
  replicas: 2
  template:
    metadata:
      labels:
        app: nginx
    spec:
      containers:
      - name: nginx
        image: nginx:1.14.2
        ports:
        - containerPort: 80

Validate the file with:

$ datree test deployment.yaml

The dashboard shows 21 passed rules and 9 failed rules. After configuring 30 default policies in the Datree dashboard, the rule set can be edited and re‑run.

After fixing the first four errors, the updated deployment.yaml includes memory and CPU requests and limits:

apiVersion: apps/v1
kind: Deployment
metadata:
  name: nginx-deployment
spec:
  selector:
    matchLabels:
      app: nginx
  replicas: 2
  template:
    metadata:
      labels:
        app: nginx
    spec:
      containers:
      - name: nginx
        image: nginx:1.14.2
        resources:
          limits:
            memory: 200Mi
            cpu: 1
          requests:
            memory: 100Mi
            cpu: 100m
        ports:
        - containerPort: 80

Running the test again yields:

$ datree test deployment.yaml

The total failed rules drop from 9 to 5, confirming that the memory and CPU requests/limits have been correctly configured.

Thus, Datree can be used to standardize and avoid configuration errors in Kubernetes.