Running applications

Procedure

1. Create the BusyBox manifest files by running the following commands:

   1. Define the directory location:

      $ MANIFEST_DIR=/etc/microshift/manifests

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   2. Make the directory:

      $ sudo mkdir -p ${MANIFEST_DIR}

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   3. Place the YAML file in the directory:

      $ sudo tee ${MANIFEST_DIR}/busybox.yaml &>/dev/null <<EOF
      
      apiVersion: v1
      kind: Namespace
      metadata:
        name: busybox
      ---
      apiVersion: apps/v1
      kind: Deployment
      metadata:
        name: busybox-deployment
      spec:
        selector:
          matchLabels:
            app: busybox
        template:
          metadata:
            labels:
              app: busybox
          spec:
            containers:
            - name: busybox
              image: BUSYBOX_IMAGE
              command:
                - sleep
                - "3600"
      EOF

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2. Next, create the kustomize manifest files by running the following commands:

   1. Place the YAML file in the directory:

      $ sudo tee ${MANIFEST_DIR}/kustomization.yaml &>/dev/null <<EOF
      ---
      apiVersion: kustomize.config.k8s.io/v1beta1
      kind: Kustomization
      namespace: busybox
      resources:
        - busybox.yaml
      images:
        - name: BUSYBOX_IMAGE
          newName: registry.k8s.io/busybox
      EOF

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3. Restart Red Hat build of MicroShift to apply the manifests by running the following command:

   $ sudo systemctl restart microshift

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4. Apply the manifests and start the busybox pod by running the following command:

   $ oc get pods -n busybox

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Procedure

1. To test that greenboot is running a health check script file, reboot the host by running the following command:

   $ sudo reboot

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2. Examine the output of greenboot health checks by running the following command:

   $ sudo journalctl -o cat -u greenboot-healthcheck.service

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   Note

   Red Hat build of MicroShift core service health checks run before the workload health checks.

   Example output

   GRUB boot variables:
   boot_success=0
   boot_indeterminate=0
   Greenboot variables:
   GREENBOOT_WATCHDOG_CHECK_ENABLED=true
   ...
   ...
   FINISHED
   Script '40_microshift_running_check.sh' SUCCESS
   Running Wanted Health Check Scripts...
   Finished greenboot Health Checks Runner.

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