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Question: What is Docker Registry, and how does it relate to Docker Hub?
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Answer: The Docker Registry is an open-source tool for storing and distributing Docker images locally within
an organization's infrastructure. It allows organizations to have their private registry for Docker images, providing more
control over image distribution and security.
The Docker Hub, on the other hand, is a public registry service provided by Docker, Inc., which hosts both public and
private Docker images. Organizations can choose to use Docker Hub for public images or set up their private Docker Registry for private images.
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Question: What is Docker Swarm overlay network, and how does it facilitate communication between containers?
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Answer: Docker Swarm overlay network is a network driver that enables communication between containers running
on different Docker hosts in a Swarm cluster. It creates a distributed virtual network overlay that spans all nodes in the
cluster, allowing containers to communicate with each other regardless of their physical location.
Overlay network uses VXLAN encapsulation to provide network isolation and secure communication between containers.
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Question: Can you explain the role of Docker in CI/CD pipelines.?
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Answer: Docker plays a crucial role in CI/CD pipelines by providing a consistent environment for building, testing,
and deploying applications. Developers can package their applications and dependencies into Docker containers, ensuring that
the same environment is used throughout the development lifecycle.
CI/CD tools like Jenkins, GitLab CI, etc. can then
automate the process of building Docker images, running tests inside containers, and deploying containers to production environments,
resulting in faster and more reliable software delivery.
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Question: How do you monitor Docker containers and services?
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Answer: Docker provides several tools for monitoring containers and services, including Docker Stats, Docker Events, and Docker Swarm built-in monitoring.
Additionally, third-party monitoring tools like Prometheus, Grafana, and ELK stack can be integrated with Docker to collect
metrics, visualize performance data, and set up alerts for container health and resource usage.
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Question: What are Docker labels, and how are they used?
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Answer: The Docker labels are key-value metadata pairs that can be attached to Docker objects such as images,
containers, volumes, and networks. They provide a way to add custom metadata to Docker resources, which can be used for organizing,
querying, and filtering resources based on specific criteria.
Docker Labels are commonly used for versioning, categorizing, and adding descriptive information to Docker images and containers.
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Question: What are Docker containers used for in a microservices architecture?
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Answer: In a microservices architecture, Docker containers are used to encapsulate and deploy individual microservices
as lightweight, independent units. Each microservice runs in its container with its dependencies, allowing for isolation,
scalability, and easy deployment.
Docker containers enable developers to develop, test, and deploy microservices independently, facilitating agility and rapid
iteration in the development process.
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