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# Fluss Helm Chart
This chart deploys an Apache Fluss cluster on Kubernetes, following Helm best practices.
It requires a Zookeeper ensemble to be running in the same Kubernetes cluster. In future releases, we may add support for an embedded Zookeeper cluster.
## Development environment
| component | version |
| ------------------------------------------------------------------------------ | ------- |
| [Docker](https://docs.docker.com/) | v28.3.2 |
| [Minikube](https://minikube.sigs.k8s.io/docs/) | v1.36.0 |
| [Kubernetes](https://kubernetes.io) | v1.25.3 |
| [Helm](https://helm.sh) | v3.18.6 |
| [Apache Fluss](https://fluss.apache.org/docs/) | v0.9.0-incubating |
## Image requirements
A container image for Fluss is available on DockerHub as `fluss/fluss`. You can use it directly or build your own from this repo. To use your own image you need to build the project with [Maven](https://fluss.apache.org/community/dev/building/) and build it with Docker.
The Maven build will create all required artifacts in the `build-target` directory. You need to copy it into the `docker` directory. The Dockerfile in this directory will copy these artifacts into the image.
In minikube, you can use the local Docker daemon to build the image without pushing it to a registry:
```bash
eval $(minikube -p minikube docker-env)
docker build -t fluss/fluss:0.9.0-incubating .
```
## Overview
It creates:
- 1x CoordinatorServer as a StatefulSet with a headless Service (stable per‑pod DNS)
- 3x TabletServers as a StatefulSet with a headless Service (stable per‑pod DNS)
- ConfigMap for server.yaml (CoordinatorServer and TabletServers) to override default Fluss configuration
- Optional PersistentVolumes for data directories
## Quick start
1) ZooKeeper deployment:
To start Zookeeper use Bitnami’s chart or your own deployment. If you have an existing Zookeeper cluster, you can skip this step. Example with Bitnami’s chart:
```bash
helm repo add bitnami https://charts.bitnami.com/bitnami
helm repo update
helm install zk bitnami/zookeeper \
--set replicaCount=3 \
--set auth.enabled=false \
--set persistence.size=5Gi
```
2) Default (Zookeeper available in-cluster):
```bash
helm install fluss ./fluss-helm
```
With an optional namespace flag `--namespace <your-namespace>` if you want to install it in a specific namespace.
This assumes, that Zookeeper is reachable at `zk-zookeeper.<your-namespace>.svc.cluster.local:2181`. If your Zookeeper address is different, you can override it with:
```bash
helm install fluss ./fluss-helm \
--set zookeeper.address=<your-zk-address>
```
## Configuration reference
Important Fluss options surfaced by the chart:
- zookeeper.address: CoordinatorServer and TabletServer point to your ZK ensemble.
- data.dir, remote.data.dir: Local persistent path for data; remote path for snapshots (OSS/HDFS). TabletServers default to a PVC mounted at data.dir.
- bind.listeners: Where the server actually binds.
- advertised.listeners: Externally advertised endpoints for clients and intra‑cluster communication. In K8s, advertise stable names.
- internal.listener.name: Which listener is used for internal communication (defaults to INTERNAL).
- tablet-server.id: Required to be unique per TabletServer. The chart auto‑derives this from the StatefulSet pod ordinal at runtime.
### Zookeeper and storage
- zookeeper.address must point to a reachable ensemble.
- data.dir defaults to /tmp/fluss/data; use a PVC if persistence.enabled=true.
## Resource management
Set resources with requests/limits as appropriate for production. There are no defaults to make it also run on environments with little resources such as Minikube.
## Troubleshooting
- Image pull errors:
- If using a private registry, configure image.pullSecrets and ensure the image repository/tag are correct.
- Pods not ready: ensure ZooKeeper is reachable and ports 9123 are open.
- Connection failures: check advertised.listeners configuration and DNS resolution within the cluster by using kubectl exec to get a shell in a pod and test connectivity (using nc).