creating-and-managing-pods.md

Creating and managing virtual machines

demo.sh script which you used provisioned Virtlet, started virtual machine with cirros image, started nginx container and exposed it via Service. Let's check how it all works.

The script will finish and will ssh into a cirros vm. Switch to another console and list the pods:

kubectl get pod

cirros vm and nginx pod are both listed. Now list the services:

kubectl get svc

Now go back to the first console where you are logged in the cirros vm. Check that you have internet access:

ping 8.8.8.8
ping mirantis.com

In cluster network communication also works. Retrieve data from Nginx. Use Nginx service IP:

curl <nginx_service_ip>

Exit VM using ctrl-d command.

View Pod details

Use the kubectl get and kubectl describe commands to view details for the cirros VM Pod:

View the logs of a Pod

Use the kubectl logs command to view the logs for the cirros VM Pod:

kubectl logs cirros-vm

Attach to the VM

Use the kubectl attach command to attach to the VM console

kubectl attach -it cirros-vm

Create new Ubuntu VM

Now you can create another virtual machine. Let's create Ubuntu VM from Virtlet examples:

cat virtlet/examples/ubuntu-vm-with-testuser.yaml
kubectl apply -f virtlet/examples/ubuntu-vm-with-testuser.yaml

This example also shows how cloud-init script can be used. Here new user: testuser is created and also ssh key is injected. Wait for ubuntu VM:

kubectl get pod -w

Now attach to the VM using testuser/testuser credentials:

kubectl attach -it ubuntu-vm-with-testuser

Check if it also has internet connection.

Use in Deployment

Because Virtlet VMs are just normal Pods you can create Deployment,DaemonSet or even StatefulSet from Virtual Machines:

cat examples/deployment-cirros-vm.yaml
kubectl apply -f examples/deployment-cirros-vm.yaml

When it's ready you can scale it:

kubectl scale --replicas=2 deploy/cirros