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Docker, what is it all about?
- Docker is a tool that allows applications to run in self-contained containers, isolated from the host system.
- Containers are lightweight, virtualized environments ensuring app isolation without emulating hardware and OS like VMs.
- Docker images include code, runtime, libraries, making it portable and preventing dependency issues.
- Dockerfiles define steps to build images starting from base images that are lightweight and efficient.
- Each instruction in a Dockerfile represents a step in the build process, creating layers in the final image.
- Docker optimizes builds by reusing layers if requirements haven't changed, enhancing image creation efficiency.
- Docker containers run directly on the host's kernel, utilizing namespaces for isolation and efficiency.
- Runtime flags like -p, -d, -name, -e, -v, --rm, --network provide flexibility in running and controlling containers.
- Docker automatically deletes containers if --rm flag is used, useful for testing and avoiding leftover containers.
- By structuring Dockerfiles, using .dockerignore, and multi-stage builds, image size and efficiency can be optimized.
- Volumes in Docker offer persistence and data sharing between containers or with the local system, enhancing data management.
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