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ocp_prereqs_powervs.md

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PowerVS Prerequisites

Create an IBM Cloud account.

If you don’t already have one, you need a paid IBM Cloud account to create your Power Systems Virtual Server instance. To create an account, go to: cloud.ibm.com.

Create an IBM Cloud account API key

Please refer to the following documentation to create an API key.

Create Power Systems Virtual Server Service Instance

After you have an active IBM Cloud account, you can create a Power Systems Virtual Server service. To do so, perform the following steps:

  1. Log in to the IBM Cloud dashboard and search for Power in the catalog.   Search for Power  
  2. Select Power Systems Virtual Server   Select Power Systems Virtual Server  
  3. Fill required details   Fill Details   Provide a meaningful name for your instance in the Service name field and select the proper resource group. More details on resource groups is available from the following link   Provide service name  
  4. Create Service Click on "Create" to create the service instance.   Create service  

Create Private Network

A private network is required for your OpenShift cluster. Perform the following steps to create a private network for the Power Systems Virtual Server service instance created in the previous step.

  1. Select the previously created "Service Instance" and create a private subnet by clicking "Subnets" and providing the required inputs.   Note: If you see a screen displaying CRN and GUID, then click "View full details" to access the "Subnet" creation page.   Select subnet  
  2. Provide the network details and click "Create subnet"   Provide Input   On successful network creation, the following output will be displayed in the dashboard.   Create subnet

Raise a Service Request to enable IP communication between PowerVS instances on private network

In order for your instances to communicate within the subnet, you'll need to create a service request.

Click on Support in the top bar of the dashboard and scroll down to Contact Support, then select "Create a case"   Create a case   Select "Power Systems Virtual Server" tile   Create a case Page   Complete the details as shown using the following template:  

  • [Subject:] Enable communication between PowerVS instances on private network
  • [Body:] 
      Please enable IP communication between PowerVS instances for the following private network:
  Name: <your-subnet-name-from-above>
  Type: Private
  CIDR: <your ip subnet-from-above>
  VLAN ID: <your-vlan-id> (listed in your subnet details post-creation)
  Location: <your-location> (listed in your subnet details post-creation)
  Service Instance: <your-service-name>

  Following is a complete example of the support case content.

  Please enable IP communication between PowerVS instances for the following private network:
  Name: ocp-net
  Type: Private
  CIDR: 192.168.25.0/24
  VLAN ID: 293
  Location: eu-de-2
  Service Instance: ocp-powervs-frankfurt-2

  Sample support request   Click "Continue" to accept agreements, and then Click "Submit case".   Submit Case  

This usually takes a day to get enabled.

RHCOS and RHEL/CentOS 8.X Images for OpenShift

RHEL image is used for bastion and RHCOS is used for the OpenShift cluster nodes.

You'll need to create OVA formatted images for RHEL and RHCOS, upload them to IBM Cloud Object storage and then import these images as boot images in your PowerVS service instance.

Further, the image disk should be minimum of 120 GB in size.

Creating OVA images

  • If you have PowerVC then you can follow the instructions provided in the link to export an existing PowerVC image to OVA image.
  • You can also use the following tool to convert Qcow2 image to OVA.
  • Qcow2 Image Links
    • RHEL 8.3 Qcow2 image is available from the following link
    • CentOS 8.3 Wcow2 image is available from the following link
    • RHCOS Qcow2 image is available from the following link

Note: RHCOS image version is tied to the specific OCP release. For example RHCOS-4.6 image needs to be used for OCP 4.6 release.

Uploading to IBM Cloud Object Storage

  • Create IBM Cloud Object Storage service and bucket Please refer to the following link for instructions to create IBM Cloud Object Storage service and required storage bucket to upload the OVA images.  
  • Create secret and access keys with Hash-based Message Authentication Code (HMAC) Please refer to the following link for instructions to create the keys required for importing the images into your PowerVS service instance.  
  • Upload the OVA image to Cloud Object storage bucket Please refer to the following link for uploading the OVA image to the respective bucket. Alternatively you can also use the following tool.

Importing the images in PowerVS

Choose the previously created PowerVS "Service Instance", click "View full details" and select "Boot images". Click the "Import image" option and fill the requisite details like image name, storage type and cloud object storage details.

Example screenshot showing import of RHEL image that is used for bastion   Image Import-RHEL   Example screenshot showing import of RHCOS image used for OCP   Image Import-RHCOS  

Your PowerVS service instance is now ready for OpenShift clusters.