Getting Started with Docker and Dockerfile

Key benefits of Docker for web developers includes:

• Consistency between envionments.

• Simplify working with multiple framework versions.

• Setup a development environment quickly.

• All of these.

• Ship code faster.

Which of following statements is untrue about Docker.

• By default, Docker doesn't create containers in user namespaces because not all Linux distributions enable user namespace sin their kernel.

• User namespaces allow a container's process to be privileged in its own user namespace, whilst remaining non-privileged in the host's user namespace.

• Docker creates a sub-directory in its data root so that newly created objects are owned by the UID/GID at the top of the docker-remap user's subordinate ranges.

Which of the following statements regarding the ephemerality of containers is FALSE?

• Containerized applications tend to be easier to scale.

• Containers starts ridiculously fast.

• Containers require IT Ops to build individual instances.

• Containers can be packaged and instantiated directly from developer IDEs.

How does the dockerd expose the Docker API?

• gRPC on a Unix socket.

• As a versioned HTTP(S) REST interface.

What key concepts does Docker rely on?

• Images and containers

• Images and virtual machines

• Images and archives

• Virtual machines and LXC

Docker containers can be started and stopped.

• True

• False

Which component of the Docker implements the Docker API.

• The Docker daemon.

• The Docker client.

• containerd

• The OCI layer.

What is the atomic unit of scheduling in Docker.

• the image

• the pod

• the job

• the container

• the process

Which component of the Docker interfaces with the kernel primitives that are used to build containers?

• The Docker daemon

• The OCI layer (runc)

• The REST API

Which of following statements is true about the architecture of Docker?

• The docker command executes REST API calls.

• All answers are true.

• The architecture is client-server.

• Docker containers are run as root.

• The daemon must be run as root.