MinIO Helm Chart

MinIO is a High Performance Object Storage released under GNU Affero General Public License v3.0. It is API compatible with Amazon S3 cloud storage service. Use MinIO to build high performance infrastructure for machine learning, analytics and application data workloads.

For more detailed documentation please visit here

Introduction

This chart bootstraps MinIO Cluster on Kubernetes using the Helm package manager.

Prerequisites

• Helm cli with Kubernetes cluster configured.
• PV provisioner support in the underlying infrastructure. (We recommend using https://github.com/minio/direct-csi)
• Use Kubernetes version v1.19 and later for best experience.

Configure MinIO Helm repo

helm repo add minio https://charts.min.io/

Installing the Chart

Install this chart using:

helm install --namespace minio --set rootUser=rootuser,rootPassword=rootpass123 --generate-name minio/minio

The command deploys MinIO on the Kubernetes cluster in the default configuration. The configuration section lists the parameters that can be configured during installation.

Upgrading the Chart

You can use Helm to update MinIO version in a live release. Assuming your release is named as my-release, get the values using the command:

helm get values my-release > old_values.yaml

Then change the field image.tag in old_values.yaml file with MinIO image tag you want to use. Now update the chart using

helm upgrade -f old_values.yaml my-release minio/minio

Default upgrade strategies are specified in the values.yaml file. Update these fields if you'd like to use a different strategy.

Configuration

Refer the Values file for all the possible config fields.

You can specify each parameter using the --set key=value[,key=value] argument to helm install. For example,

helm install --name my-release --set persistence.size=1Ti minio/minio

The above command deploys MinIO server with a 1Ti backing persistent volume.

Alternately, you can provide a YAML file that specifies parameter values while installing the chart. For example,

helm install --name my-release -f values.yaml minio/minio

Persistence

This chart provisions a PersistentVolumeClaim and mounts corresponding persistent volume to default location /export. You'll need physical storage available in the Kubernetes cluster for this to work. If you'd rather use emptyDir, disable PersistentVolumeClaim by:

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

"An emptyDir volume is first created when a Pod is assigned to a Node, and exists as long as that Pod is running on that node. When a Pod is removed from a node for any reason, the data in the emptyDir is deleted forever."

Existing PersistentVolumeClaim

If a Persistent Volume Claim already exists, specify it during installation.

1. Create the PersistentVolume
2. Create the PersistentVolumeClaim
3. Install the chart

helm install --set persistence.existingClaim=PVC_NAME minio/minio

NetworkPolicy

To enable network policy for MinIO, install a networking plugin that implements the Kubernetes NetworkPolicy spec, and set networkPolicy.enabled to true.

For Kubernetes v1.5 & v1.6, you must also turn on NetworkPolicy by setting the DefaultDeny namespace annotation. Note: this will enforce policy for all pods in the namespace:

kubectl annotate namespace default "net.beta.kubernetes.io/network-policy={\"ingress\":{\"isolation\":\"DefaultDeny\"}}"

With NetworkPolicy enabled, traffic will be limited to just port 9000.

For more precise policy, set networkPolicy.allowExternal=true. This will only allow pods with the generated client label to connect to MinIO. This label will be displayed in the output of a successful install.

Existing secret

Instead of having this chart create the secret for you, you can supply a preexisting secret, much like an existing PersistentVolumeClaim.

First, create the secret:

kubectl create secret generic my-minio-secret --from-literal=rootUser=foobarbaz --from-literal=rootPassword=foobarbazqux

Then install the chart, specifying that you want to use an existing secret:

helm install --set existingSecret=my-minio-secret minio/minio

The following fields are expected in the secret:

All corresponding variables will be ignored in values file.

Configure TLS

To enable TLS for MinIO containers, acquire TLS certificates from a CA or create self-signed certificates. While creating / acquiring certificates ensure the corresponding domain names are set as per the standard DNS naming conventions in a Kubernetes StatefulSet (for a distributed MinIO setup). Then create a secret using

kubectl create secret generic tls-ssl-minio --from-file=path/to/private.key --from-file=path/to/public.crt

Then install the chart, specifying that you want to use the TLS secret:

helm install --set tls.enabled=true,tls.certSecret=tls-ssl-minio minio/minio

Installing certificates from third party CAs

MinIO can connect to other servers, including MinIO nodes or other server types such as NATs and Redis. If these servers use certificates that were not registered with a known CA, add trust for these certificates to MinIO Server by bundling these certificates into a Kubernetes secret and providing it to Helm via the trustedCertsSecret value. If .Values.tls.enabled is true and you're installing certificates for third party CAs, remember to include MinIO's own certificate with key public.crt, if it also needs to be trusted.

For instance, given that TLS is enabled and you need to add trust for MinIO's own CA and for the CA of a Keycloak server, a Kubernetes secret can be created from the certificate files using kubectl:

kubectl -n minio create secret generic minio-trusted-certs --from-file=public.crt --from-file=keycloak.crt

If TLS is not enabled, you would need only the third party CA:

kubectl -n minio create secret generic minio-trusted-certs --from-file=keycloak.crt

The name of the generated secret can then be passed to Helm using a values file or the --set parameter:

trustedCertsSecret: "minio-trusted-certs"

or

--set trustedCertsSecret=minio-trusted-certs

Create buckets after install

Install the chart, specifying the buckets you want to create after install:

helm install --set buckets[0].name=bucket1,buckets[0].policy=none,buckets[0].purge=false minio/minio

Description of the configuration parameters used above -

• buckets[].name - name of the bucket to create, must be a string with length > 0
• buckets[].policy - can be one of none|download|upload|public
• buckets[].purge - purge if bucket exists already

Create policies after install

Install the chart, specifying the policies you want to create after install:

helm install --set policies[0].name=mypolicy,policies[0].statements[0].resources[0]='arn:aws:s3:::bucket1',policies[0].statements[0].actions[0]='s3:ListBucket',policies[0].statements[0].actions[1]='s3:GetObject' minio/minio

Description of the configuration parameters used above -

• policies[].name - name of the policy to create, must be a string with length > 0
• policies[].statements[] - list of statements, includes actions and resources
• policies[].statements[].resources[] - list of resources that applies the statement
• policies[].statements[].actions[] - list of actions granted

Create user after install

Install the chart, specifying the users you want to create after install:

helm install --set users[0].accessKey=accessKey,users[0].secretKey=secretKey,users[0].policy=none,users[1].accessKey=accessKey2,users[1].secretRef=existingSecret,users[1].secretKey=password,users[1].policy=none minio/minio

Description of the configuration parameters used above -

• users[].accessKey - accessKey of user
• users[].secretKey - secretKey of usersecretRef
• users[].existingSecret - secret name that contains the secretKey of user
• users[].existingSecretKey - data key in existingSecret secret containing the secretKey
• users[].policy - name of the policy to assign to user

Uninstalling the Chart

Assuming your release is named as my-release, delete it using the command:

helm delete my-release

or

helm uninstall my-release

The command removes all the Kubernetes components associated with the chart and deletes the release.