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# MinIO Kubernetes YAML Files [![Slack](https://slack.min.io/slack?type=svg)](https://slack.min.io) [![Docker Pulls](https://img.shields.io/docker/pulls/minio/minio.svg?maxAge=604800)](https://hub.docker.com/r/minio/minio/) |
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This document covers the steps needed to deploy MinIO on Kubernetes using plain `YAML` files. |
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## Table of Contents |
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- [Prerequisites](#Prerequisites) |
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- [MinIO Standalone Server Deployment](#minio-standalone-server-deployment) |
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- [MinIO Distributed Server Deployment](#minio-distributed-server-deployment) |
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- [MinIO GCS Gateway Deployment](#minio-gcs-gateway-deployment) |
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- [Monitoring MinIO in Kubernetes](#monitoring-minio) |
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<a name="Prerequisites"></a> |
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## Prerequisites |
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To run this example, you need Kubernetes version >=1.4 cluster installed and running. You will also need to have installed and configured the [`kubectl`](https://kubernetes.io/docs/tasks/kubectl/install/) command line tool in your path. Please see the [getting started guides](https://kubernetes.io/docs/setup/) for installation instructions for your platform. |
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<a name="minio-standalone-server-deployment"></a> |
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## MinIO Standalone Server Deployment |
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The following section describes the process to deploy standalone MinIO server on Kubernetes. The deployment uses the [official MinIO Docker image](https://hub.docker.com/r/minio/minio/) from Docker Hub. |
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This section uses following core components of Kubernetes: |
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- [_Pods_](https://kubernetes.io/docs/user-guide/pods/) |
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- [_Services_](https://kubernetes.io/docs/user-guide/services/) |
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- [_Deployments_](https://kubernetes.io/docs/user-guide/deployments/) |
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- [_Persistent Volume Claims_](https://kubernetes.io/docs/user-guide/persistent-volumes/#persistentvolumeclaims) |
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### Standalone Quickstart |
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Run the below commands to get started quickly |
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```sh |
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kubectl create -f https://raw.githubusercontent.com/minio/minio/master/docs/orchestration/kubernetes/minio-standalone-pvc.yaml |
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kubectl create -f https://raw.githubusercontent.com/minio/minio/master/docs/orchestration/kubernetes/minio-standalone-deployment.yaml |
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kubectl create -f https://raw.githubusercontent.com/minio/minio/master/docs/orchestration/kubernetes/minio-standalone-service.yaml |
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``` |
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### Create Persistent Volume Claim |
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MinIO needs persistent storage to store objects. If there is no persistent storage, the data stored in MinIO instance will be stored in the container file system and will be destroyed as soon as the container restarts. |
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Create a persistent volume claim (PVC) to request storage for the MinIO instance. Kubernetes looks out for PVs matching the PVC request in the cluster and binds it to the PVC automatically. Run the following to create the PersistentVolumeClaim: |
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```sh |
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kubectl create -f https://raw.githubusercontent.com/minio/minio/master/docs/orchestration/kubernetes/minio-standalone-pvc.yaml |
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persistentvolumeclaim "minio-pv-claim" created |
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``` |
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### Create MinIO Deployment |
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A deployment encapsulates replica sets and pods. If a pod goes down, the replication controller makes sure another pod comes up automatically. This way, you won’t need to bother about pod failures and will have a stable MinIO service available. Create the Deployment using the following command: |
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```sh |
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kubectl create -f https://raw.githubusercontent.com/minio/minio/master/docs/orchestration/kubernetes/minio-standalone-deployment.yaml |
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deployment "minio-deployment" created |
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``` |
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### Create MinIO Service |
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Now that you have a MinIO deployment running, you may either access it internally (within the cluster) or expose it as a Service onto an external (outside of your cluster, for example public internet) IP address, depending on your use case. You can achieve this using Services. There are 3 major service types — the default type is ClusterIP, which exposes a service to connection from inside the cluster. NodePort and LoadBalancer are two types that expose services to external traffic. |
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In this example, we expose the MinIO Deployment by creating a LoadBalancer service. Create the MinIO service using the following command |
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```sh |
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kubectl create -f https://raw.githubusercontent.com/minio/minio/master/docs/orchestration/kubernetes/minio-standalone-service.yaml |
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service "minio-service" created |
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``` |
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The `LoadBalancer` service takes couple of minutes to launch. To check if the service was created successfully, run the following command: |
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```sh |
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kubectl get svc minio-service |
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NAME CLUSTER-IP EXTERNAL-IP PORT(S) AGE |
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minio-service 10.55.248.23 104.199.249.165 9000:31852/TCP 1m |
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``` |
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### Update existing MinIO Deployment |
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You can update an existing MinIO deployment to use a newer MinIO release. To do this, use the `kubectl set image` command: |
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```sh |
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kubectl set image deployment/minio-deployment minio=<replace-with-new-minio-image> |
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``` |
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Kubernetes will restart the deployment to update the image. You will get a message similar to the one shown below, on successful update: |
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``` |
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deployment "minio-deployment" image updated |
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``` |
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### Standalone Resource cleanup |
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You can cleanup the cluster using |
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```sh |
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kubectl delete deployment minio \ |
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&& kubectl delete pvc minio-pv-claim \ |
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&& kubectl delete svc minio-service |
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``` |
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<a name="minio-distributed-server-deployment"></a> |
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## MinIO Distributed Server Deployment |
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The following document describes the process to deploy [distributed MinIO](https://docs.min.io/docs/distributed-minio-quickstart-guide) server on Kubernetes. This example uses the [official MinIO Docker image](https://hub.docker.com/r/minio/minio/~/dockerfile/) from Docker Hub. |
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This example uses following core components of Kubernetes: |
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- [_Pods_](https://kubernetes.io/docs/concepts/workloads/pods/pod/) |
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- [_Services_](https://kubernetes.io/docs/concepts/services-networking/service/) |
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- [_Statefulsets_](https://kubernetes.io/docs/tutorials/stateful-application/basic-stateful-set/) |
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### Distributed Quickstart |
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Run the below commands to get started quickly |
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```sh |
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kubectl create -f https://raw.githubusercontent.com/minio/minio/master/docs/orchestration/kubernetes/minio-distributed-headless-service.yaml |
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kubectl create -f https://raw.githubusercontent.com/minio/minio/master/docs/orchestration/kubernetes/minio-distributed-statefulset.yaml |
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kubectl create -f https://raw.githubusercontent.com/minio/minio/master/docs/orchestration/kubernetes/minio-distributed-service.yaml |
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``` |
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### Create MinIO Headless Service |
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Headless Service controls the domain within which StatefulSets are created. The domain managed by this Service takes the form: `$(service name).$(namespace).svc.cluster.local` (where “cluster.local” is the cluster domain), and the pods in this domain take the form: `$(pod-name-{i}).$(service name).$(namespace).svc.cluster.local`. This is required to get a DNS resolvable URL for each of the pods created within the Statefulset. Create the Headless Service using the following command |
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```sh |
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$ kubectl create -f https://raw.githubusercontent.com/minio/minio/master/docs/orchestration/kubernetes/minio-distributed-headless-service.yaml |
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service "minio" created |
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``` |
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### Create MinIO Statefulset |
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A StatefulSet provides a deterministic name and a unique identity to each pod, making it easy to deploy stateful distributed applications. To launch distributed MinIO you need to pass drive locations as parameters to the minio server command. Then, you’ll need to run the same command on all the participating pods. StatefulSets offer a perfect way to handle this requirement. Create the Statefulset using the following command: |
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```sh |
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$ kubectl create -f https://raw.githubusercontent.com/minio/minio/master/docs/orchestration/kubernetes/minio-distributed-statefulset.yaml |
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statefulset "minio" created |
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``` |
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### Create MinIO Service |
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Now that you have a MinIO statefulset running, you may either access it internally (within the cluster) or expose it as a Service onto an external (outside of your cluster, maybe public internet) IP address, depending on your use case. You can achieve this using Services. There are 3 major service types — default type is ClusterIP, which exposes a service to connection from inside the cluster. NodePort and LoadBalancer are two types that expose services to external traffic. Create the MinIO service using the following command |
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```sh |
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$ kubectl create -f https://raw.githubusercontent.com/minio/minio/master/docs/orchestration/kubernetes/minio-distributed-service.yaml |
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service "minio-service" created |
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``` |
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The `LoadBalancer` service takes couple of minutes to launch. To check if the service was created successfully, run the command |
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```sh |
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$ kubectl get svc minio-service |
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NAME CLUSTER-IP EXTERNAL-IP PORT(S) AGE |
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minio-service 10.55.248.23 104.199.249.165 9000:31852/TCP 1m |
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``` |
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### Update existing MinIO StatefulSet |
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You can update an existing MinIO StatefulSet to use a newer MinIO release. To do this, use the `kubectl patch statefulset` command: |
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```sh |
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kubectl patch statefulset minio --type='json' -p='[{"op": "replace", "path": "/spec/template/spec/containers/0/image", "value":"<replace-with-new-minio-image>"}]' |
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``` |
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On successful update, you should see the output below |
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``` |
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statefulset "minio" patched |
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``` |
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Then delete all the pods in your StatefulSet one by one using the command shown below. |
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```sh |
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kubectl delete minio-0 |
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``` |
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As you delete each pod, Kubernetes will restart that pod for you, using the new image. Once all the pods are restarted, your upgrade process is |
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complete. |
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### Resource cleanup |
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You can cleanup the cluster using |
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```sh |
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kubectl delete statefulset minio \ |
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&& kubectl delete svc minio \ |
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&& kubectl delete svc minio-service |
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``` |
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### Deploying on cluster nodes with local host path |
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If your cluster does not have a storage solution or PV abstraction, you must explicitly define what nodes you wish to run MinIO on, and define a homogeneous path to a local fast block device available on every host. |
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This must be changed in the example daemonset: [minio-distributed-daemonset.yaml](https://github.com/minio/minio/blob/master/docs/orchestration/kubernetes/minio-distributed-daemonset.yaml) |
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Specifically the hostpath: |
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```yaml |
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hostPath: |
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path: /data/minio/ |
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``` |
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And the list of hosts: |
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```yaml |
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- http://hostname{1...4}/data/minio |
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``` |
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Once deployed, tag the defined host with the `minio-server=true` label: |
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```bash |
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kubectl label node hostname1 -l minio-server=true |
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kubectl label node hostname2 -l minio-server=true |
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kubectl label node hostname3 -l minio-server=true |
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kubectl label node hostname4 -l minio-server=true |
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``` |
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<a name="minio-gcs-gateway-deployment"></a> |
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## MinIO GCS Gateway Deployment |
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The following section describes the process to deploy MinIO GCS Gateway on Kubernetes. The deployment uses the [official MinIO Docker image](https://hub.docker.com/r/minio/minio/) from Docker Hub. |
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This section uses following core components of Kubernetes: |
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- [_Secrets_](https://kubernetes.io/docs/concepts/configuration/secret/) |
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- [_Services_](https://kubernetes.io/docs/user-guide/services/) |
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- [_Deployments_](https://kubernetes.io/docs/user-guide/deployments/) |
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### GCS Gateway Quickstart |
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Create the Google Cloud Service credentials file using the steps mentioned [here](https://github.com/minio/minio/blob/master/docs/gateway/gcs.md#create-service-account-key-for-gcs-and-get-the-credentials-file). |
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Use the path of file generated above to create a Kubernetes `secret`. |
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```sh |
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kubectl create secret generic gcs-credentials --from-file=/path/to/gcloud/credentials/application_default_credentials.json |
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``` |
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Then download the `minio-gcs-gateway-deployment.yaml` file |
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```sh |
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wget https://raw.githubusercontent.com/minio/minio/master/docs/orchestration/kubernetes/minio-gcs-gateway-deployment.yaml |
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``` |
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Update the section `gcp_project_id` with your GCS project ID. Then run |
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```sh |
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kubectl create -f minio-gcs-gateway-deployment.yaml |
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kubectl create -f https://raw.githubusercontent.com/minio/minio/master/docs/orchestration/kubernetes/minio-gcs-gateway-service.yaml |
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``` |
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### Create GCS Credentials Secret |
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A `secret` is intended to hold sensitive information, such as passwords, OAuth tokens, and ssh keys. Putting this information in a secret is safer and more flexible than putting it verbatim in a pod definition or in a docker image. |
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Create the Google Cloud Service credentials file using the steps mentioned [here](https://github.com/minio/minio/blob/master/docs/gateway/gcs.md#create-service-account-key-for-gcs-and-get-the-credentials-file). |
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Use the path of file generated above to create a Kubernetes `secret`. |
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```sh |
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kubectl create secret generic gcs-credentials --from-file=/path/to/gcloud/credentials/application_default_credentials.json |
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``` |
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### Create MinIO GCS Gateway Deployment |
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A deployment encapsulates replica sets and pods — so, if a pod goes down, the replication controller makes sure another pod comes up automatically. This way you won’t need to bother about pod failures and will have a stable MinIO service available. |
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MinIO Gateway uses GCS as its storage backend and needs to use a GCP `projectid` to identify your credentials. Update the section `gcp_project_id` with your |
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GCS project ID. Create the Deployment using the following command |
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```sh |
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kubectl create -f https://raw.githubusercontent.com/minio/minio/master/docs/orchestration/kubernetes/minio-gcs-gateway-deployment.yaml |
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deployment "minio-deployment" created |
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``` |
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### Create MinIO LoadBalancer Service |
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Now that you have a MinIO deployment running, you may either access it internally (within the cluster) or expose it as a Service onto an external (outside of your cluster, for example via public internet) IP address, depending on your use case. You can achieve this using Services. There are 3 major service types — default type is ClusterIP, which exposes a service to connection from inside the cluster. NodePort and LoadBalancer are two types that expose services to external traffic. Create the MinIO service using the following command |
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```sh |
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kubectl create -f https://raw.githubusercontent.com/minio/minio/master/docs/orchestration/kubernetes/minio-gcs-gateway-service.yaml |
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service "minio-service" created |
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``` |
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The `LoadBalancer` service takes couple of minutes to launch. To check if the service was created successfully, run the command |
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```sh |
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kubectl get svc minio-service |
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NAME CLUSTER-IP EXTERNAL-IP PORT(S) AGE |
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minio-service 10.55.248.23 104.199.249.165 9000:31852/TCP 1m |
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``` |
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### Update Existing MinIO GCS Deployment |
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You can update an existing MinIO deployment to use a newer MinIO release. To do this, use the `kubectl set image` command: |
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```sh |
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kubectl set image deployment/minio-deployment minio=<replace-with-new-minio-image> |
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``` |
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Kubernetes will restart the deployment to update the image. You will get a message as shown below, on successful update: |
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``` |
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deployment "minio-deployment" image updated |
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``` |
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### GCS Gateway Resource Cleanup |
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You can cleanup the cluster using |
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```sh |
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kubectl delete deployment minio-deployment \ |
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&& kubectl delete secret gcs-credentials |
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``` |
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<a name="monitoring-minio"></a> |
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