# Kustomize and Kubernetes Commands

## Generate and Apply Manifests

To build a Kubernetes manifest using Kustomize and apply it to the `kafka` namespace:

```bash
kustomize build overlay/test/ > manifest.yaml | kubectl kustomize overlay/test/ > manifest.yaml
kubectl -n kafka apply -f manifest.yaml
```

## Viewing the Kustomize Directory

You can view the configuration for a Kustomize directory as follows:

```bash
kubectl kustomize argo-cd-work/base/kafka-core
```

---

## Kustomize Documentation

For detailed documentation on Kustomization, visit: [Kustomize Documentation](https://kubectl.docs.kubernetes.io/references/kustomize/kustomization/)

---

## Applying Overlays

To apply a specific overlay (e.g., `dev`), first build the configuration and apply it to the `kafka` namespace:

```bash
kustomize build overlay/dev/ > dev.yml
kubectl -n kafka apply -f dev.yml
```

---

## Preparing for Kafka Connect

Before setting up Kafka Connect, ensure the following steps are completed:

1. **Create a Docker Image**  
   Build and push the Docker image required for Kafka Connect.

2. **Create Docker Secrets for Authentication**  
   Generate secrets for S3 login or other credentials.

3. **Create Platform and S3 Credentials**  
   Create the following Kubernetes secrets for authentication:
   - `docker-platform-creds`
   - `s3-minio-creds`

   Verify the secrets are present in the `kafka` namespace:

   ```bash
   kubectl -n kafka get secrets
   ```

   Example output:

   ```plaintext
   NAME                    TYPE                              DATA   AGE
   docker-platform-creds   kubernetes.io/dockerconfigjson    1     15d
   s3-minio-creds          Opaque                            2     13d
   ```