LCA Virtualization & Container Management 5

Question 1

Which command migrates a running KVM virtual machine to another host without downtime?

Accepted Answer

virsh migrate --live

Answer

'virsh migrate --live' performs live migration, transferring VM memory pages to the target host while the guest continues running.

Question 2

What is the difference between a Docker image and a Docker container?

Accepted Answer

Images are read-only templates; containers are writable running instances

Answer

A Docker image is an immutable layered template, while a container is a live, writable instance created from that image.

Question 3

What does 'virt-clone' do in a KVM environment?

Accepted Answer

Creates a copy of an existing virtual machine definition and disk

Answer

virt-clone duplicates an existing VM's XML configuration and disk image to create a new independent virtual machine.

Question 4

Which Docker networking mode shares the host's network stack directly with the container?

Accepted Answer

host

Answer

In 'host' network mode, the container uses the host's network interfaces directly with no isolation or NAT.

Question 5

What does the OCI (Open Container Initiative) standardize?

Accepted Answer

Container image format and runtime specifications

Answer

OCI defines open industry standards for container image format (image-spec) and container runtime behavior (runtime-spec).

(LCA) Certified Linux Administrator Practice Test