feat: Add Helm Chart for NATS S3

[ashupednekar]

This PR introduces a new Helm chart for NATS S3, an S3-compatible object storage layer powered by NATS JetStream.
It enables simple, configurable deployment of NATS S3 on Kubernetes.

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📂 Chart Overview

Adds a new Helm chart for deploying NATS S3, an S3-compatible object storage layer powered by NATS JetStream.
The chart is based on the wpnpeiris/nats-s3 project and includes configurable values for image, NATS servers, authentication, and service parameters.

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⚙️ Configuration Overview

The chart is designed to make NATS S3 easily configurable through values.yaml.
Key configurable sections include:

General

• nameOverride / fullnameOverride / namespaceOverride — Customize resource names and namespaces.
• replicaCount — Number of NATS S3 pod replicas to deploy.

Image

• image.repository — Container image to use (default: ghcr.io/wpnpeiris/nats-s3).
• image.tag — Image tag (default: latest).
• image.pullPolicy — Kubernetes pull policy (IfNotPresent, Always, etc.).

Service

• service.type — Kubernetes service type (ClusterIP, NodePort, etc.).
• service.port / service.targetPort — Define the external and internal ports for NATS S3.
• service.nodePort — Optional NodePort override (used if type is NodePort).

NATS Connection

• nats.servers — Comma-separated list of NATS server URLs, e.g. nats://nats:4222.

Authentication

• auth.enabled — Enables username/password authentication.
• auth.username / auth.password — Basic credentials for S3 access (used if auth.enabled is true).
• auth.existingSecret — Optionally reference an existing Kubernetes Secret containing credentials.
  When set, this overrides inline username/password values.

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🚀 Example Usage

helm repo add nats https://nats-io.github.io/k8s/helm/charts/
helm install my-nats-s3 nats/nats-s3 -f my-values.yaml

Example my-values.yaml:

nats:
  servers: "nats://nats:4222"

auth:
  enabled: true
  username: "natsadmin"
  password: "natsadmin"

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Usage

Note

The optional dependency for s3 in the nats chart is currently an oci dependency pointing to my ghcr artifact, can be changed to file once/if merged

Right now, we need to cd into the nats chart and build the dependencies to pull in the s3 chart

helm/charts/nats on  feat_s3 !? macbook
❯ helm dependency update
Hang tight while we grab the latest from your chart repositories...
...Successfully got an update from the "nats" chart repository
Update Complete. ⎈Happy Helming!⎈
Error: could not retrieve list of tags for repository oci://ghcr.io/ashupe
dnekar/charts/nats-s3: GET "https://ghcr.io/v2/ashupednekar/charts/nats-s3
/nats-s3/tags/list": response status code 404: name unknown: repository na
me not known to registry
helm/charts/nats on  feat_s3 !? macbook
❯ helm dependency update
Hang tight while we grab the latest from your chart repositories...
...Successfully got an update from the "nats" chart repository
Update Complete. ⎈Happy Helming!⎈
Saving 1 charts
Downloading nats-s3 from repo oci://ghcr.io/ashupednekar/charts
Pulled: ghcr.io/ashupednekar/charts/nats-s3:0.1.0
Digest: sha256:95b396a38241a050b20e589ecf87d6fb274bec0496d05fd9542e2af60a9
063b4
Deleting outdated charts

The chart can then be installed by enabling the s3.enabled=true value.

❯ helm install nats . -f ~/Documents/nats.yaml --set s3.enabled=true
NAME: nats
LAST DEPLOYED: Tue Oct 28 11:03:37 2025
NAMESPACE: default
STATUS: deployed
REVISION: 1
helm/charts/nats on  feat_s3 !? macbook
❯ k get po   
NAME                        READY   STATUS    RESTARTS      AGE
nats-0                      1/1     Running   0             21s
nats-1                      1/1     Running   0             21s
nats-2                      1/1     Running   0             21s
nats-box-789cd4555d-9w2n2   1/1     Running   0             21s
nats-s3-84bb45c49b-x27gr    1/1     Running   2 (19s ago)   21s
pgo-85767cc986-d64p7        1/1     Running   1 (4d ago)    9d
helm/charts/nats on  feat_s3 !? macbook
❯ 

TODO: fetch nats credentials and auto-configure.. instead of expecting seperate values. Will to this if accepted

🧰 Future Enhancements

• Add additional authentication options, to the secret
• Integration with NATS account- and JetStream-based policies

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Maintainers:

• Community Effort (info@nats.io)
• Shoutout: wpnpeiris/nats-s3

[wallyqs]

docs here are from nats kafka?

[ashupednekar]

Thanks for pointing out, the docs commits were unpushed, my bad... updated

[ashupednekar]

Note: if this goes upstream, this can change to file:// to pick from the same repo

[wpnpeiris]

this should be version of latest nats-s3?, latest we have 0.3.3

[wpnpeiris]

it is commented as disabled by default, so this should be false?

[Jarema]

Hey!
Thanks for the contribution!

However, we should not add support for non-nats-io org project k8s chart here.
For now - probably the nats-s3 repo would make more sense.

[ashupednekar]

Yes, makes sense... will add it to the nats-s3 repo for now...

There's a proposal from its maintainer to add nats-s3 to natsio, we could come back to this if that happens

[wpnpeiris]

Yes, makes sense... will add it to the nats-s3 repo for now...

There's a proposal from its maintainer to add nats-s3 to natsio, we could come back to this if that happens

@ashupednekar could you bring this PR into nats-s3? would be great added for nats-s3.

[ashupednekar]

Yes, makes sense... will add it to the nats-s3 repo for now...

There's a proposal from its maintainer to add nats-s3 to natsio, we could come back to this if that happens

@ashupednekar could you bring this PR into nats-s3? would be great added for nats-s3.

Yeah, sure... will do