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Deploy the MinIO Operator

minio

Table of Contents

Overview

MinIO is a Kubernetes-native high performance object store with an S3-compatible API. The MinIO Kubernetes Operator supports deploying MinIO Tenants onto private and public cloud infrastructures ("Hybrid" Cloud).

The following procedure installs the latest stable version () of the MinIO Operator and MinIO Plugin on Kubernetes infrastructure:

  • The MinIO Operator installs a Custom Resource Document (CRD) <concepts/extend-kubernetes/api-extension/custom-resources/#customresourcedefinitions> to support describing MinIO tenants as a Kubernetes object <concepts/overview/working-with-objects/kubernetes-objects/>. See the MinIO Operator CRD Reference <operator/blob/master/docs/tenant_crd.adoc> for complete documentation on the MinIO CRD.
  • The MinIO Kubernetes Plugin brings native support for deploying and managing MinIO tenants on a Kubernetes cluster using the kubectl minio command.

This documentation assumes familiarity with all referenced Kubernetes concepts, utilities, and procedures. While this documentation may provide guidance for configuring or deploying Kubernetes-related resources on a best-effort basis, it is not a replacement for the official Kubernetes Documentation <>.

Prerequisites

Kubernetes Version 1.19.0

Starting with v4.0.0, the MinIO Operator and MinIO Kubernetes Plugin require Kubernetes 1.19.0 and later. The Kubernetes infrastructure and the kubectl CLI tool must have the same version of 1.19.0+.

Prior to v4.0.0, the MinIO Operator and Plugin required Kubernetes 1.17.0. You must upgrade your Kubernetes infrastructure to 1.19.0 or later to use the MinIO Operator or Plugin v4.0.0 or later.

kubectl Configuration

This procedure assumes that your local host machine has both the correct version of kubectl for your Kubernetes cluster and the necessary access to that cluster to create new resources.

Kubernetes TLS Certificate API

The MinIO Operator automatically generates TLS Certificate Signing Requests (CSR) and uses the Kubernetes certificates.k8s.io TLS certificate management API <tasks/tls/managing-tls-in-a-cluster/> to create signed TLS certificates.

The MinIO Operator therefore requires that the Kubernetes kube-controller-manager configuration include the following configuration settings <reference/command-line-tools-reference/kube-controller-manager/#options>:

  • --cluster-signing-key-file - Specify the PEM-encoded RSA or ECDSA private key used to sign cluster-scoped certificates.
  • --cluster-signing-cert-file - Specify the PEM-encoded x.509 Certificate Authority certificate used to issue cluster-scoped certificates.

The Kubernetes TLS API uses the CA signature algorithm for generating new TLS certificate. MinIO recommends ECDSA (e.g. NIST P-256 curve) or EdDSA (e.g. Curve25519 <7748>) TLS private keys/certificates due to their lower computation requirements compared to RSA. See minio-TLS-supported-cipher-suites for a complete list of supported TLS Cipher Suites.

The Operator cannot complete initialization if the Kubernetes cluster is not configured to respond to a generated CSR. Certain Kubernetes providers do not specify these configuration values by default.

To verify whether the kube-controller-manager has the required settings, use the following command. Replace $CLUSTER-NAME with the name of the Kubernetes cluster:

kubectl get pod kube-controller-manager-$CLUSTERNAME-control-plane \ 
  -n kube-system -o yaml

Confirm that the output contains the highlighted lines. The output of the example command above may differ from the output in your terminal:

spec:
containers:
- command:
    - kube-controller-manager
    - --allocate-node-cidrs=true
    - --authentication-kubeconfig=/etc/kubernetes/controller-manager.conf
    - --authorization-kubeconfig=/etc/kubernetes/controller-manager.conf
    - --bind-address=127.0.0.1
    - --client-ca-file=/etc/kubernetes/pki/ca.crt
    - --cluster-cidr=10.244.0.0/16
    - --cluster-name=my-cluster-name
    - --cluster-signing-cert-file=/etc/kubernetes/pki/ca.crt
    - --cluster-signing-key-file=/etc/kubernetes/pki/ca.key
...

Important

The MinIO Operator automatically generates TLS certificates for all MinIO Tenant pods using the specified Certificate Authority (CA). Clients external to the Kubernetes cluster must trust the Kubernetes cluster CA to connect to the MinIO Operator or MinIO Tenants.

Clients which cannot trust the Kubernetes cluster CA can try disabling TLS validation for connections to the MinIO Operator or a MinIO Tenant.

Alternatively, you can generate x.509 TLS certificates signed by a known and trusted CA and pass those certificates to MinIO Tenants. See minio-tls for more complete documentation.

Procedure

/operations/install-deploy-manage/upgrade-minio-operator