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minio/docs/orchestration/kubernetes/README.md

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Kubernetes constructs like Deployments and StatefulSets provide perfect platform to deploy Minio server in standalone, distributed or shared mode. In addition, using Minio Helm Chart, you can deploy Minio server with a single command on your cluster.

Minio Helm Chart offers great deal of customizability, still if you'd rather like to deploy Minio using custom config files, you can do that as well. This blog post offers an introduction to running Minio on Kubernetes using .yaml configuration files.

1. 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.
  • Helm package manager installed on your Kubernetes cluster.

2. Deploy Minio using Helm Chart

Install Minio chart by

$ helm install stable/minio

Above command deploys Minio on the Kubernetes cluster in the default configuration. Below section lists all the configurable parameters of the Minio chart and their default values.

Configuration

Parameter Description Default
image Minio image name minio/minio
imageTag Minio image tag. Possible values listed here. RELEASE.2017-01-25T03-14-52Z
imagePullPolicy Image pull policy Always
mode Minio server mode (standalone, shared or distributed) standalone
numberOfNodes Number of nodes (applicable only for Minio distributed mode). Should be 4 <= x <= 16 4
accessKey Default access key AKIAIOSFODNN7EXAMPLE
secretKey Default secret key wJalrXUtnFEMI/K7MDENG/bPxRfiCYEXAMPLEKEY
configPath Default config file location ~/.minio
mountPath Default mount location for persistent drive /export
serviceType Kubernetes service type LoadBalancer
servicePort Kubernetes port where service is exposed 9000
persistence.enabled Use persistent volume to store data true
persistence.size Size of persistent volume claim 10Gi
persistence.storageClass Type of persistent volume claim generic
persistence.accessMode ReadWriteOnce or ReadOnly ReadWriteOnce
resources CPU/Memory resource requests/limits Memory: 256Mi, CPU: 100m

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=100Gi \
    stable/minio

The above command deploys Minio server with a 100Gi 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 stable/minio

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 stable/minio

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

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

This provisions Minio server in distributed mode with 8 nodes. Note that the numberOfNodes value should be an integer between 4 and 16 (inclusive).

StatefulSet limitations applicable to distributed Minio

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

Shared Minio

To provision Minio servers in shared mode, set the mode field to shared,

$ helm install --set mode=shared stable/minio

This provisions 4 Minio server nodes backed by single storage. To change the number of nodes in your shared Minio deployment, set the numberOfNodes field,

$ helm install --set mode=shared,numberOfNodes=8 stable/minio

This provisions Minio server in shared mode with 8 nodes.

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 stable/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."

3. Uninstalling the Chart

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

$ helm delete my-release

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

Notes

  • An instance of a chart running in a Kubernetes cluster is called a release. Helm automatically assigns a unique release name after installing the chart. You can also set your preferred name by:
$ helm install --name my-release stable/minio
  • To override the default keys, pass the access and secret keys as arguments to helm install.
$ helm install --set accessKey=myaccesskey,secretKey=mysecretkey \
    stable/minio

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