# Object Lock and Immutablity Guide [![Slack](https://slack.min.io/slack?type=svg)](https://slack.min.io)

MinIO server allows WORM for specific objects or by configuring a bucket with default object lock configuration that applies default retention mode and retention duration to all objects. This makes objects in the bucket immutable i.e. delete of the version are not allowed until an expiry specified in the bucket's object lock configuration or object retention.

WARNING: when installing over an existing deployment, the two deployments will be merged together by Helm, which may lead to unexpected results.

#### Legacy Gateway Helm charts

Istio historically offered two different charts - `manifests/charts/gateways/istio-ingress` and `manifests/charts/gateways/istio-egress`.
These are replaced by this chart.

                out <- []byte("response")

                // Return the request for reuse
                grid.PutByteBuffer(req)
            }
        }
        // out is closed by the caller and should never be closed by the handler.
        return nil
    }

    err := manager.RegisterStreamingHandler(grid.HandlerDiskInfo, StreamHandler{
        Handle: handler,
        Subroute: "asubroute",

## 3. Update deployment yaml file

Whether you are planning to use Kubernetes StatefulSet or Kubernetes Deployment, the steps remain the same.

If you're using certificates provided by a CA, add the below section in your yaml file under `spec.volumes[]`

```yaml
    volumes:
      - name: secret-volume
        secret:
          secretName: tls-ssl-minio
          items:
          - key: public.crt

MinIO uses a key-management-system (KMS) to support SSE-S3. If a client requests SSE-S3, or auto-encryption is enabled, the MinIO server encrypts each object with an unique object key which is protected by a master key managed by the KMS.

## Quick Start

Constructor injection is particularly concise in Kotlin:

```
class MyTest(
  private val server: MockWebServer
) {
  @Test
  fun test() {
    ...
  }
}
```

Multiple instances can be obtained by naming additional ones:

```
class MyTest(
  private val server: MockWebServer,
  @MockWebServerInstance("server2") private val server2: MockWebServer,
  @MockWebServerInstance("server3") private val server3: MockWebServer

MinIO needs a persistent volume to store configuration and application data. For testing purposes, you can launch MinIO by simply passing a directory (`/data` in the example below). This directory gets created in the container filesystem at the time of container start. But all the data is lost after container exits.

```sh
docker run \
  -p 9000:9000 \

```bash
helm install --set persistence.enabled=false minio/minio
```

   functions.

  > Note: The service mesh is not an overlay network. It
  > simplifies and enhances how microservices in an application talk to each
  > other over the network provided by the underlying platform.

- **Istiod** - The Istio control plane. It provides service discovery, configuration and certificate management. It consists of the following sub-components:

If you have traditional spinning (hdd) drives, some applications with high concurrency might require MinIO cluster to be tuned such that to avoid random I/O on the drives. The way to convert high concurrent I/O into a sequential I/O is by reducing the number of concurrent operations allowed per cluster. This allows MinIO cluster to be operationally resilient to such workloads, while also making sure the drives are at optimal efficiency and responsive.