Managing our Microservices: Docker and Kubernetes Flashcards
What does Docker guarantee with its container-based approach?
Docker guarantees consistency and isolation by packaging software with all necessary components, ensuring it runs the same regardless of the environment.
How does Docker solve the “it works on my machine” problem?
Docker manages dependencies through Dockerfiles to ensure all environments use the same versions of everything, providing consistency across development, testing, and production stages.
What is a major advantage of Docker’s portability?
Docker containers can be run on any machine with Docker installed, regardless of the underlying operating system, which simplifies moving software between different environments.
How does Docker enhance scalability and efficiency in resource usage?
Docker containers share the host system’s kernel and can be limited in CPU and memory use, allowing more containers to run on the same hardware than traditional virtual machines.
What makes Docker ideal for rapid deployment?
Docker containers can be started and stopped in seconds and utilize layering and caching to speed up the build and distribution process, allowing for quick scaling and updates.
Why is Docker’s ecosystem considered a significant advantage?
Docker’s vast ecosystem through Docker Hub offers access to a multitude of community and official containers, which speeds up deployment and ensures standardization.
What is the main function of the Docker Daemon?
The Docker Daemon is responsible for managing Docker objects such as images, containers, networks, and volumes. It listens for Docker API requests and handles the services needed to build and manage containers.
What role does the Docker Client play in Docker’s architecture?
The Docker Client is the primary way users interact with Docker. It sends commands to the Docker Daemon, which then executes them. Commands include building, running, and inspecting Docker containers and images.
What are Docker Images and how are they used?
Docker Images are read-only templates used to create containers. They include all the dependencies and source code needed to run an application. Images are built from a Dockerfile and stored in a registry like Docker Hub.
Describe the purpose of Docker Containers.
Docker Containers are the runnable instances of Docker images. They isolate applications from the host system, ensuring that they run consistently regardless of where they are deployed.
What is Docker Hub?
Docker Hub is a cloud-based registry service that allows you to link code repositories, build your images, and test them, store manually pushed images, and link to Docker Cloud so you can deploy images to your hosts.
How do Docker Registries interact with the Docker ecosystem?
Docker Registries store Docker images. Users can push images to or pull images from registries. Public registries like Docker Hub and private ones can be used depending on security needs and company policies.
What is the Dockerfile and its importance in the Docker ecosystem?
A Dockerfile is a script composed of various commands and arguments listed successively to automatically perform actions on a base image in order to create a new one. They are crucial for defining the steps to assemble an image that meets specific needs.
What problem does Docker address related to application deployment?
Docker addresses the problem of inconsistent environments by encapsulating an application and its dependencies into a container. This ensures that the application runs consistently across different computing environments.
How does Docker improve developer productivity?
Docker containers can be used to create isolated development environments quickly and can be easily replicated. This speeds up the development process and reduces conflicts between working on different parts of a project or with different technologies.
