Create a PVC and bind to a pod

What are PV and PVC?

A PV (Persistent Volume) in Kubernetes is a resource used to store data. It is attached to pods but have a separate lifecycle, specified by its Reclaim Policy. This policy determines if a PV will continue to exist or will be deleted when a pod attached to it gets destroyed.

A PV represents a piece of available storage. To use a PV, a user needs to create a persistent volume claim (PVC), which is a request for storage. Kubernetes passes this request to a storage class, which creates PVs automatically in response to the PVC.

Create a PVC

There are four storage classes based on the disk type: standard, ultra, cold, and ssd_hiiops. The standard disk-type storage class exists by default, so you simply need to create a default PVC. For any other disk type, you first have to create a storage class with the required disk type and then create a PVC.

Create a PVC to connect to a standard disk-type storage class

1. Create a YAML file to configure a PVC:

Enter your custom values instead:

• block-pvc—the PVC name
• 1Gi—the required storage size

2. Run the kubectl command from the file directory:

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    kubectl apply -f <name of the YAML file>.yaml

You will get the output:

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    persistentvolumeclaim/<the name of the created PVC> created

It means you have created a PVC with a standard disk-type storage class. To connect the PVC to your pods, refer to the Bind a PVC to a pod section.

Create a PVC to connect to ultra/cold/ssd_hiiops disk-type storage

You can check the available disk types in different regions in the Gcore Control panel or via an API request.

1. Create a YAML file to configure a storage class with the required disk type:

Enter your custom values instead:

• csi-sc-cinderplugin-hiiops—the storage class name
• ssd_hiiops—the required disk type

2. Run the kubectl command from the file directory:

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    kubectl apply -f <name of the created YAML file>.yaml

You will get the output:

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    storageclass/<the name of the created storage class> created

3. Create a YAML file to configure a PVC:

Enter your custom values instead:

• block-pvc—your PVC name
• csi-sc-cinderplugin-hiiops—the name of the created storage class
• 1Gi— the required storage size

4. Run the kubectl command from the file directory:

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    kubectl apply -f <name of the created YAML file>.yaml

You will get the output:

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    persistentvolumeclaim/<the name of the created PVC> created

It means you have created a PVC with a storage class of the required disk type. To connect the PVC to your pods, refer to the section below.

Bind your PVC to a pod

1. Create a YAML file to bind the created storage class to your pod.

Enter your custom values instead:

• mypod—the pod name
• myfrontend—the container name
• "/var/www/html"—the destination inside the pod where to mount the storage class
• mypd—the storage class name
• block-pvc—the created PVC name

2. Run the kubectl command from the file directory:

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    kubectl apply -f <name of the created YAML file>.yaml

3. You will get the output:

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    pod/<the pod name> created

It means you have connected the PVC to your pod, and now its containers can access the storage.