What is the kubectl apply?

Question

Accepted Answer

**kubectl apply** — **applying configuration**.

```bash
# Apply
kubectl apply -f deployment.yaml
kubectl apply -f k8s/  # Entire directory
kubectl apply -f k8s/ -R  # Recursively

# Validation
kubectl apply -f deployment.yaml --dry-run=client
kubectl apply -f deployment.yaml --dry-run=server
kubectl apply -f deployment.yaml --validate=true

# Diff
kubectl diff -f deployment.yaml

# Automatic labeling
kubectl apply -f deployment.yaml --prune -l app=myapp

# Last-applied configuration
kubectl get deployment myapp -o yaml | grep -A 5 "kubectl.kubernetes.io/last-applied-configuration"

# Delete
kubectl delete -f deployment.yaml
kubectl delete -f deployment.yaml --ignore-not-found
kubectl delete -f deployment.yaml -n production
```

**Advantages:**
- Idempotent.
- Declarative.
- Diff before apply.

DevOps: What is the kubectl apply?