In a Docker Compose setup, how can you link a service to another service's network without directly exposing its ports to the host?
By using the depends_on keyword and specifying the target service
depends_on
By defining both services under the same custom network within the networks section
networks
By using the expose keyword in the dependent service's configuration and listing the target service's ports
expose
It is not possible to achieve this; services must have ports exposed to the host for communication
What is the primary advantage of using Docker containers in a CI/CD pipeline?
Guaranteed execution on any operating system
Reduced storage footprint for build artifacts
Enhanced environment consistency across development, testing, and production
Elimination of the need for version control
What role does a manager node play in a Docker Swarm cluster?
Provides networking and load balancing for the cluster
Stores and distributes Docker images to worker nodes
Executes the actual application tasks within containers
Manages cluster state, schedules tasks, and ensures service availability
When choosing a data persistence strategy in Docker, which factor should be considered carefully?
The version of Docker being used.
The color scheme of the Docker logo.
The number of containers running on the host.
The sensitivity and importance of the data being stored.
What is the default networking mode in Docker Compose when no explicit network configuration is provided?
Bridge
None
Host
Overlay
What is the purpose of the 'docker push' command in the context of a Docker Registry?
Build a Docker image from a Dockerfile
Upload an image to a registry
Download an image from a registry
Run a Docker container from an image
How can you create a custom network with specific configurations (e.g., IP range, driver) in Docker Compose?
Docker Compose does not allow custom network configurations
By defining the network within the services section of the docker-compose.yml file
services
docker-compose.yml
By specifying the network configurations within the networks section of the docker-compose.yml file
By using the docker network create command separately and referencing the network in the docker-compose.yml file
docker network create
What is the primary purpose of Docker Swarm?
Storing and versioning Docker images
Building Docker images faster
Deploying and managing containerized applications at scale
Scanning Docker images for vulnerabilities
How does Docker integrate with GitLab CI for automated testing?
GitLab CI can use Docker images to provide isolated environments for running tests
Docker directly executes test suites within the GitLab CI/CD platform
Docker replaces the need for a separate testing framework
GitLab CI automatically generates Dockerfiles based on project code
Which command is used to initialize a Docker Swarm?
docker swarm create
docker swarm init
docker swarm start
docker swarm up