What is the primary advantage of using multi-stage builds in Docker?
To simplify the process of building complex applications.
To improve network performance during the build process.
To reduce the size of the final Docker image.
To enable parallel execution of build steps.
In Docker Compose, what is the primary function of environment variables?
To configure the network settings for services
To pass dynamic configuration values to services at runtime
To specify the build context for a service's Dockerfile
To define the Docker image to be used for a service
How can Docker be utilized to speed up the build process in a CI/CD pipeline?
By replacing the need for unit tests in the development process
By directly deploying code changes to production without testing
By automatically scaling the number of build servers based on load
By caching frequently used dependencies within Docker images
How does Docker contribute to improved security in CI/CD?
Docker automatically encrypts data at rest and in transit
Docker enforces strict access control policies on application code
Docker's containerization provides isolation, limiting the impact of vulnerabilities
Docker eliminates the need for security updates by isolating applications
What is the primary function of a Docker Registry?
Managing network traffic between containers
Storing and distributing Docker images
Building Docker images
Running Docker containers in production
When choosing a data persistence strategy in Docker, which factor should be considered carefully?
The version of Docker being used.
The number of containers running on the host.
The sensitivity and importance of the data being stored.
The color scheme of the Docker logo.
How does Docker Swarm achieve network communication between containers on different nodes?
By creating a single, shared network interface for all containers
By creating an overlay network that spans across all nodes in the cluster
By establishing secure tunnels between individual containers
By relying on the host operating system's networking capabilities
Which command is used to list all running Docker containers?
docker run
docker start
docker ps
docker images
How can you invalidate the Docker build cache for a specific instruction?
By deleting the corresponding image layer.
By using the --no-cache flag during the build process.
--no-cache
All of the above.
By modifying the instruction itself.
What is the purpose of the COPY --from instruction in a multi-stage Docker build?
COPY --from
To copy files from a previous build stage to the current build stage.
To copy files from the current build stage to a later build stage.
To copy files from a remote repository to the current build stage.
To copy files from the host machine to the current build stage.