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Docker is a containerization platform that allows developers and IT professionals to build, deploy, and run applications inside isolated environments called containers. These containers provide a consistent and reliable way to deploy software, ensuring that applications run the same way across different environments. Docker is lightweight and portable, making it a popular choice for modern software development and deployment.
• Containerization: Package applications and their dependencies into a single container. • Isolation: Run multiple containers simultaneously without interference. • Lightweight: Containers share the host OS kernel, making them more efficient than virtual machines. • Scalability: Easily scale applications by spinning up multiple containers. • Volumes: Persist data even after containers are stopped or removed. • Networking: Configure custom networks for containers to communicate. • Docker Hub: Access a vast library of pre-built images. • CI/CD Integration: Seamlessly integrate with DevOps pipelines. • Security: Enhance application security with built-in features.
docker pull to download a base image from Docker Hub (e.g., docker pull nginx).docker run (e.g., docker run -p 8080:80 nginx).docker ps.docker exec -it <container-id> /bin/bash.docker run -v /host/path:/container/path).What is Docker used for?
Docker is used for building, deploying, and running applications in a consistent and portable way across different environments.
How is Docker different from virtual machines?
Docker containers are lightweight and share the host OS kernel, whereas virtual machines (VMs) require a full OS install and are heavier in resource usage.
How does Docker handle data persistence?
Docker uses volumes to persist data. Volumes allow data to remain even after the container is stopped or removed, ensuring data is not lost.