kubevirt: add vm2 + notes

kubevirt/README.md

@@ -0,0 +1,38 @@
+## Host tunings
+
+To fix
+
+```
+"component":"virt-handler","level":"error","msg":"Error starting tun
+device plugin","pos":"device_controller.go:73","reason":"failed to add
+the device root path to the watcher: no such file or
+directory","timestamp":"2021-06-07T20:15:48.557412Z"
+```
+
+use
+
+```
+modprobe tun
+```
+
+To fix
+
+```
+  Warning  FailedScheduling  67s (x2 over 69s)  default-scheduler  0/4
+  nodes are available: 1 node(s) had taint
+  {node-role.kubernetes.io/master: }, that the pod didn't tolerate, 3
+  Insufficient devices.kubevirt.io/vhost-net.
+
+```
+
+```
+modprobe vhost_net
+```
+
+## Failing to create tap devices
+
+```
+failed to configure vmi network: Critical network error: error
+creating tap device named tap0; failed to create tap device tap0: exit
+status 1
+```

kubevirt/vm2-networking.yaml

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+apiVersion: kubevirt.io/v1alpha3
+kind: VirtualMachineInstance
+metadata:
+  name: testvmi-nocloud
+spec:
+  terminationGracePeriodSeconds: 30
+  domain:
+    resources:
+      requests:
+        memory: 1024M
+    devices:
+      disks:
+      - name: containerdisk
+        disk:
+          bus: virtio
+      - name: emptydisk
+        disk:
+          bus: virtio
+      - disk:
+          bus: virtio
+        name: cloudinitdisk
+      interfaces:
+        - name: default
+          masquerade: {}
+  networks:
+  - name: default
+    pod: {}
+  volumes:
+  - name: containerdisk
+    containerDisk:
+      image: kubevirt/fedora-cloud-container-disk-demo:latest
+  - name: emptydisk
+    emptyDisk:
+      capacity: "2Gi"
+  - name: cloudinitdisk
+    cloudInitNoCloud:
+      userData: |-
+        #cloud-config
+        password: fedora
+        chpasswd: { expire: False }