Docker
What is Docker?
Docker is an open-source platform that enables developers to build, ship, and run applications in lightweight, isolated environments called containers. Containers package the application and its dependencies, ensuring it runs consistently across different environments.
Core Components of Docker
Docker Engine: The runtime that builds and runs containers.
Docker Daemon: Manages containers on the host.
Docker CLI: Command-line interface to interact with Docker.
Docker Images:
Blueprints for containers.
Built using Dockerfiles (scripts defining how to build the image).
Docker Containers:
Runtime instances of images.
Lightweight and portable.
Docker Hub:
A registry to store and share Docker images.
Why Docker?
Consistency: "Works on my machine" issues are eliminated.
Efficiency: Containers are lightweight compared to traditional VMs.
Scalability: Easily scale applications across environments.
Portability: Run anywhere—local, cloud, or hybrid setups.
Key Features
Isolation: Each container has its own resources (CPU, memory, etc.).
Multi-Platform Support: Linux, Windows, macOS.
Networking: Containers can communicate using virtual networks.
Volumes: Persistent storage for data across container restarts.
Popular Use Cases
Microservices: Break applications into modular services.
CI/CD Pipelines: Streamline testing and deployment.
Cloud-Native Development: Integrate with Kubernetes for orchestration.
Dev/Test Environments: Quickly spin up isolated environments.
What is Docker and it's command list ?
Docker is an open-source containerization platform that allows developers to create, deploy, and run applications in a portable and isolated environment called a container. With Docker, developers can package an application and its dependencies into a container image that can be run on any machine that supports Docker.
Here is a list of some commonly used Docker commands:
docker build: Builds a Docker image from a Dockerfile.
docker run: Runs a Docker container from a Docker image.
docker pull: Pulls a Docker image from a remote repository.
docker push: Pushes a Docker image to a remote repository.
docker ps: Lists all running Docker containers.
docker images: Lists all Docker images on the local machine.
docker exec: Executes a command inside a running Docker container.
docker stop: Stops a running Docker container.
docker rm: Removes a stopped Docker container.
docker rmi: Removes a Docker image from the local machine.
docker network: Manages Docker networks.
docker volume: Manages Docker volumes.
docker-compose: Manages multi-container Docker applications.
docker logs: Displays the logs of a running Docker container.
docker inspect: Inspects a Docker container or image.
These are just a few of the most commonly used Docker commands, and there are many more available depending on your specific needs.