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Question: Explain how you would debug a Docker container that is not behaving as expected?
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Answer: To debug a Docker container, you can start by inspecting the container logs using the docker logs command.
You can also enter the container's shell using docker exec to run commands and troubleshoot issues interactively.
Additionally, one can inspect the container's environment, network configuration, and resource usage using other Docker commands.
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Question: What are Docker secrets, and how are they managed securely?
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Answer: The Docker secrets are a secure way to manage sensitive data such as passwords, API keys, or SSL certificates in
Docker Swarm services. Secrets are stored encrypted on disk and only exposed to services as
in-memory files or environment variables.
Docker secrets can be created using the Docker CLI or API, and they're securely distributed to only the nodes where the service tasks are scheduled.
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Question: Can you explain the concept of Docker container orchestration and why it's important?
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Answer: Docker Container Orchestration refers to the automated management and coordination of Docker containers
across a cluster of hosts. It involves tasks such as deploying containers, scaling them up or down based on demand, load balancing
traffic between containers, and handling container failures.
Container orchestration is essential for managing complex, distributed applications composed of multiple microservices running
in containers, ensuring high availability, scalability, and resilience.
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Question: What is Docker Health Check, and why is it important?
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Answer: Docker Health Check is a feature that allows you to define a command or script to periodically check the health
of a container. Docker Engine monitors the health status of containers and takes action based on the configured health check.
Health checks are essential for ensuring the reliability and availability of containerized applications by detecting and handling
container failures or unresponsive services proactively.
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Question: Can you explain the concept of Docker multi-stage builds and their benefits?
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Answer: Docker multi-stage builds allow you to create more efficient Docker images by using multiple build stages
in a single Dockerfile. Each stage can have its dependencies and tools, allowing you to compile, build, and package an application
without including unnecessary build artifacts or dependencies in the final image.
Multi-stage builds help reduce the size of Docker images, improve build performance, and simplify the Dockerfile
by separating build-time dependencies from runtime dependencies.
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Question: How do you scale Docker containers horizontally to handle increased traffic?
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Answer: Horizontal scaling in Docker involves deploying multiple instances of the same container across multiple hosts
or nodes in a cluster. This can be achieved using container orchestration platforms like Docker Swarm or Kubernetes,
which provide features for automatic scaling based on metrics such as CPU usage or request throughput.
By adding more container replicas, the system can distribute the workload evenly and handle increased traffic effectively.
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