87 lines
3 KiB
Markdown
87 lines
3 KiB
Markdown
# AWS EBS CSI Driver
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AWS EBS CSI driver allows you to provision EBS volumes for pods in EC2 instances. The old in-tree AWS cloud provider is deprecated and will be removed in future versions of Kubernetes. So transitioning to the CSI driver is advised.
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To enable AWS EBS CSI driver, uncomment the `aws_ebs_csi_enabled` option in `group_vars/all/aws.yml` and set it to `true`.
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To set the number of replicas for the AWS CSI controller, you can change `aws_ebs_csi_controller_replicas` option in `group_vars/all/aws.yml`.
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Make sure to add a role, for your EC2 instances hosting Kubernetes, that allows it to do the actions necessary to request a volume and attach it: [AWS CSI Policy](https://github.com/kubernetes-sigs/aws-ebs-csi-driver/blob/master/docs/example-iam-policy.json)
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If you want to deploy the AWS EBS storage class used with the CSI Driver, you should set `persistent_volumes_enabled` in `group_vars/k8s_cluster/k8s_cluster.yml` to `true`.
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You can now run the kubespray playbook (cluster.yml) to deploy Kubernetes over AWS EC2 with EBS CSI Driver enabled.
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## Usage example
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To check if AWS EBS CSI Driver is deployed properly, check that the ebs-csi pods are running:
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```ShellSession
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$ kubectl -n kube-system get pods | grep ebs
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ebs-csi-controller-85d86bccc5-8gtq5 4/4 Running 4 40s
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ebs-csi-node-n4b99 3/3 Running 3 40s
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```
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Check the associated storage class (if you enabled persistent_volumes):
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```ShellSession
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$ kubectl get storageclass
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NAME PROVISIONER AGE
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ebs-sc ebs.csi.aws.com 45s
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```
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You can run a PVC and an example Pod using this file `ebs-pod.yml`:
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```yml
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--
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apiVersion: v1
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kind: PersistentVolumeClaim
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metadata:
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name: ebs-claim
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spec:
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accessModes:
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- ReadWriteOnce
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storageClassName: ebs-sc
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resources:
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requests:
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storage: 1Gi
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---
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apiVersion: v1
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kind: Pod
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metadata:
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name: app
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spec:
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containers:
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- name: app
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image: centos
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command: ["/bin/sh"]
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args: ["-c", "while true; do echo $(date -u) >> /data/out.txt; sleep 5; done"]
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volumeMounts:
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- name: persistent-storage
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mountPath: /data
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volumes:
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- name: persistent-storage
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persistentVolumeClaim:
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claimName: ebs-claim
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```
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Apply this conf to your cluster: ```kubectl apply -f ebs-pod.yml```
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You should see the PVC provisioned and bound:
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```ShellSession
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$ kubectl get pvc
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NAME STATUS VOLUME CAPACITY ACCESS MODES STORAGECLASS AGE
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ebs-claim Bound pvc-0034cb9e-1ddd-4b3f-bb9e-0b5edbf5194c 1Gi RWO ebs-sc 50s
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```
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And the volume mounted to the example Pod (wait until the Pod is Running):
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```ShellSession
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$ kubectl exec -it app -- df -h | grep data
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/dev/nvme1n1 1014M 34M 981M 4% /data
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```
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## More info
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For further information about the AWS EBS CSI Driver, you can refer to this page: [AWS EBS Driver](https://github.com/kubernetes-sigs/aws-ebs-csi-driver/).
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