Example of Host Groups

The below example shows how Host groups can be used to deploy Kubernetes workloads. This requires a camera attached to a device to receive the workload that monitors feed from that device.

Procedure

1. Go to the Hosts page in the VMware Edge Compute Stack service and select the hosts for which you want to create a group.
2. Click ADD HOST TO GROUP.
3. Provide the required details:

   Option	Description
   Group Description	Enter a description for the host group.
   Group Label Key	Enter a label key.
   Group Label Value	Enter a label value.

   The following is an example:

   Figure 1. Example Host Group Creation

   

4. Click OK.

   The group is sent to the host (or hosts) and activated for use.

5. In the deployment details, within your application specification, you can use this group as a nodeSelector to deploy only to hosts that have the label of cameraattached.

   Example deployment specification showing nodeSelector:

   apiVersion: apps/v1
   kind: Deployment
   ...
   spec:
     replicas: 1
     selector:
       matchLabels:
         app: camera-app
     strategy:
       type: Recreate
     template:
       metadata:
         labels:
           app: camera-app
       spec:
         nodeSelector:
           cameraattached: "true"
         containers:
           ...