Changing the Default Worker Node Configuration

A YAML configuration file can be used as part of your desired state repository to configure the resources made available to the default worker node used for Kubernetes workloads.

• Currently, memory, CPU and IP address information can be adjusted for the worker node virtual machine.

• If there is no worker virtual machine desired state available in the repository assigned to a host, default sizes are used of 2 CPUs and 2Gi Memory.

• If there is a worker virtual machine desired state expressed in the git repository, it is merged and it overrides the default information

• After the worker virtual machine is created and booted, changes to desired state are not applied to it until the next Edge Compute Stack Host reboot.

Example: Default Worker Node Manifest File

In the following example, we change the number of CPUs to 4 and the Memory to 8 Gi:

# Example of how to change the default kubernetes worker node configuration to provide more memory or CPUs
apiVersion: vmoperator.vmware.com/v1alpha1
kind: VirtualMachineClass
metadata:
  name: best-effort-ec-small
  # No resource requests/reservations.
  # Memory overcommit possible.
spec:
  # VM operator controller name for VirtualMachine class
  # is different so addition of controllerName attr with invalid
  # value makes vm operator ignore this VM CRD instance.
  # This is majorly done because vm operator doesn't have all the
  # needed capabilities to deploy ec worker vm.
  controllerName: vmoperator.vmware.com/ecworker
  hardware:
    cpus: 4
    memory: 8Gi
---
apiVersion: v1
kind: Namespace
metadata:
  name: ec-system
---
apiVersion: vmoperator.vmware.com/v1alpha1
kind: VirtualMachine
metadata:
  name: ec-worker
  namespace: ec-system
spec:
  className: best-effort-ec-small
  imageName: ec-wrkr.ova
  powerState: poweredOff
  vmMetadata:
    transport: CloudInit

Replacing the Default Photon Worker Node

A default Photon image is provided, which includes multiple device drivers to allow use cases that require USB pass-through of devices attached to the Edge hosts. Custom worker node images can be created and used to replace the existing ec-wrkr.ova file provided.

To customize your worker node image, follow the steps outlined in the preceding example and replace the ec-wrkr.ova file on the root of the USB/Customized ISO with exactly the same file name.