MinIO

MinIO is a High Performance Object Storage released under Apache License v2.0. 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.

MinIO supports distributed mode. In distributed mode, you can pool multiple drives (even on different machines) into a single object storage server.

For more detailed documentation please visit here

Introduction

This chart bootstraps MinIO deployment on a Kubernetes cluster using the Helm package manager.

Prerequisites

• Kubernetes 1.4+ with Beta APIs enabled for default standalone mode.
• Kubernetes 1.5+ with Beta APIs enabled to run MinIO in distributed mode.
• PV provisioner support in the underlying infrastructure.

Configure MinIO Helm repo

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

Installing the Chart

Install this chart using:

$ helm install --namespace minio --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.

Release name

An instance of a chart running in a Kubernetes cluster is called a release. Each release is identified by a unique name within the cluster. Helm automatically assigns a unique release name after installing the chart. You can also set your preferred name by:

$ helm install my-release minio/minio

Access and Secret keys

By default a pre-generated access and secret key will be used. To override the default keys, pass the access and secret keys as arguments to helm install.

$ helm install --set accessKey=myaccesskey,secretKey=mysecretkey --generate-name minio/minio

Updating MinIO configuration via Helm

ConfigMap allows injecting containers with configuration data even while a Helm release is deployed.

To update your MinIO server configuration while it is deployed in a release, you need to

1. Check all the configurable values in the MinIO chart using helm inspect values minio/minio.
2. Override the minio_server_config settings in a YAML formatted file, and then pass that file like this helm upgrade -f config.yaml minio/minio.
3. Restart the MinIO server(s) for the changes to take effect.

You can also check the history of upgrades to a release using helm history my-release. Replace my-release with the actual release name.

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

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.

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

The following table lists the configurable parameters of the MinIO chart and their default values.

Some of the parameters above map to the env variables defined in the MinIO DockerHub image.

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

Tip: You can use the default values.yaml

Distributed MinIO

This chart provisions a MinIO server in standalone mode, by default. To provision MinIO server in distributed mode, set the mode field to distributed,

$ helm install --set mode=distributed minio/minio

This provisions MinIO server in distributed mode with 4 nodes. To change the number of nodes in your distributed MinIO server, set the replicas field,

$ helm install --set mode=distributed,replicas=8 minio/minio

This provisions MinIO server in distributed mode with 8 nodes. Note that the replicas value should be a minimum value of 4, there is no limit on number of servers you can run.

You can also expand an existing deployment by adding new zones, following command will create a total of 16 nodes with each zone running 8 nodes.

$ helm install --set mode=distributed,replicas=8,zones=2 minio/minio

StatefulSet limitations applicable to distributed MinIO

1. StatefulSets need persistent storage, so the persistence.enabled flag is ignored when mode is set to distributed.
2. When uninstalling a distributed MinIO release, you'll need to manually delete volumes associated with the StatefulSet.

NAS Gateway

Prerequisites

MinIO in NAS gateway mode can be used to create multiple MinIO instances backed by single PV in ReadWriteMany mode. Currently few Kubernetes volume plugins support ReadWriteMany mode. To deploy MinIO NAS gateway with Helm chart you'll need to have a Persistent Volume running with one of the supported volume plugins. This document outlines steps to create a NFS PV in Kubernetes cluster.

Provision NAS Gateway MinIO instances

To provision MinIO servers in NAS gateway mode, set the nasgateway.enabled field to true,

$ helm install --set nasgateway.enabled=true minio/minio

This provisions 4 MinIO NAS gateway instances backed by single storage. To change the number of instances in your MinIO deployment, set the replicas field,

$ helm install --set nasgateway.enabled=true,nasgateway.replicas=8 minio/minio

This provisions MinIO NAS gateway with 8 instances.

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=accesskey=foobarbaz --from-literal=secretkey=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

Pass environment variables to MinIO containers

To pass environment variables to MinIO containers when deploying via Helm chart, use the below command line format

$ helm install --set environment.MINIO_BROWSER=on,environment.MINIO_DOMAIN=domain-name minio/minio

You can add as many environment variables as required, using the above format. Just add environment.<VARIABLE_NAME>=<value> under set flag.

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