Install KubeVirt to deploy fully virtualized virtual machines in Kubernetes Cluster.

This example is based on the environment like follows.

+----------------------+   +----------------------+

|  [ ctrl.srv.world ]  |   |   [ dlp.srv.world ]  |

|     Manager Node     |   |     Control Plane    |

+-----------+----------+   +-----------+----------+

        eth0|10.0.0.25             eth0|10.0.0.30

            |                          |

------------+--------------------------+-----------

            |                          |

        eth0|10.0.0.51             eth0|10.0.0.52

+-----------+----------+   +-----------+----------+

| [ node01.srv.world ] |   | [ node02.srv.world ] |

|     Worker Node#1    |   |     Worker Node#2    |

+----------------------+   +----------------------+

Step 1

Install KubeVirt and virtctl command.

[root@ctrl ~]# export VERSION=$(curl https://storage.googleapis.com/kubevirt-prow/release/kubevirt/kubevirt/stable.txt)

[root@ctrl ~]# wget https://github.com/kubevirt/kubevirt/releases/download/${VERSION}/kubevirt-operator.yaml

[root@ctrl ~]# wget https://github.com/kubevirt/kubevirt/releases/download/${VERSION}/kubevirt-cr.yaml

[root@ctrl ~]# wget https://github.com/kubevirt/kubevirt/releases/download/${VERSION}/virtctl-${VERSION}-linux-amd64

[root@ctrl ~]# mv virtctl-${VERSION}-linux-amd64 /usr/local/bin/virtctl

[root@ctrl ~]# chmod 755 /usr/local/bin/virtctl

[root@ctrl ~]# kubectl apply -f kubevirt-operator.yaml

namespace/kubevirt created

customresourcedefinition.apiextensions.k8s.io/kubevirts.kubevirt.io created

priorityclass.scheduling.k8s.io/kubevirt-cluster-critical created

clusterrole.rbac.authorization.k8s.io/kubevirt.io:operator created

serviceaccount/kubevirt-operator created

role.rbac.authorization.k8s.io/kubevirt-operator created

rolebinding.rbac.authorization.k8s.io/kubevirt-operator-rolebinding created

clusterrole.rbac.authorization.k8s.io/kubevirt-operator created

clusterrolebinding.rbac.authorization.k8s.io/kubevirt-operator created

deployment.apps/virt-operator created

[root@ctrl ~]# kubectl apply -f kubevirt-cr.yaml

kubevirt.kubevirt.io/kubevirt created

after a few minutes, the pods will start up as follows

[root@ctrl ~]# kubectl get pods -n kubevirt

NAME                              READY   STATUS    RESTARTS   AGE

virt-api-79f9fddf79-c6d6g         1/1     Running   0          6m46s

virt-api-79f9fddf79-jkqkc         1/1     Running   0          6m46s

virt-controller-8c5bb5cb7-gsb69   1/1     Running   0          6m11s

virt-controller-8c5bb5cb7-mcn6w   1/1     Running   0          6m11s

virt-handler-gll79                1/1     Running   0          6m11s

virt-handler-wd24v                1/1     Running   0          6m11s

virt-operator-589997bf4b-7tp9g    1/1     Running   0          7m37s

virt-operator-589997bf4b-rf2bh    1/1     Running   0          7m37s

Step 2

Create a test VM and verify it works normally.

[cent@ctrl ~]$ wget https://raw.githubusercontent.com/kubevirt/kubevirt.github.io/master/labs/manifests/vm.yaml

[cent@ctrl ~]$ kubectl apply -f vm.yaml

virtualmachine.kubevirt.io/testvm created

[cent@ctrl ~]$ kubectl get vms

NAME     AGE   STATUS    READY

testvm   4s    Stopped   False

start VM

[cent@ctrl ~]$ virtctl start testvm

VM testvm was scheduled to start

[cent@ctrl ~]$ kubectl get vms

NAME     AGE   STATUS    READY

testvm   33s   Running   True

[cent@ctrl ~]$ kubectl get vmi

NAME     AGE   PHASE     IP                NODENAME           READY

testvm   29s   Running   192.168.241.150   node02.srv.world   True

connect to the console of VM

[cent@ctrl ~]$ virtctl console testvm

Successfully connected to testvm console. The escape sequence is ^]

login as 'cirros' user. default password: 'gocubsgo'. use 'sudo' for root.

testvm login: <span class="color1">cirros</span>

Password:

$

<span class="color2"># to go back to the Host's console, push Ctrl + ] key

# * same operation as virsh command</span>

connect to VM via ssh

user is 'cirros' and password is 'gocubsgo'

[cent@ctrl ~]$ kubectl get pods

NAME                         READY   STATUS    RESTARTS   AGE

virt-launcher-testvm-ctvg9   3/3     Running   0          56s

[cent@ctrl ~]$ kubectl port-forward pod/virt-launcher-testvm-ctvg9 2220:22 &

[cent@ctrl ~]$ ssh cirros@localhost -p 2220

Handling connection for 2220

The authenticity of host '[localhost]:2220 ([::1]:2220)' can't be established.

ECDSA key fingerprint is SHA256:w6n7JIepYQqbXO7Mzf4qxUpCvzAzMEKGCy3Bc9MIMW8.

This key is not known by any other names

Are you sure you want to continue connecting (yes/no/[fingerprint])? <span class="color1">yes</span>

Warning: Permanently added '[localhost]:2220' (ECDSA) to the list of known hosts.

cirros@localhost's password:

$

$ <span class="color1">uname -a</span>

Linux testvm 4.4.0-28-generic #47-Ubuntu SMP Fri Jun 24 10:09:13 UTC 2016 x86_64 GNU/Linux

$ <span class="color1">cat /etc/os-release</span>

NAME=Buildroot

VERSION=2015.05-g31af4e3-dirty

ID=buildroot

VERSION_ID=2015.05

PRETTY_NAME="Buildroot 2015.05"

$ <span class="color1">exit</span>

Connection to localhost closed.

stop VM

[cent@ctrl ~]$ virtctl stop testvm

VM testvm was scheduled to stop

[cent@ctrl ~]$ kubectl get vms

NAME     AGE    STATUS    READY

testvm   3m4s   Stopped   False

delete VM

[cent@ctrl ~]$ kubectl delete vm testvm

virtualmachine.kubevirt.io "testvm" deleted

[cent@ctrl ~]$ kubectl get vms

No resources found in default namespace.