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What is a Docker Container?

A Docker container is a lightweight, portable, and self-sufficient unit that includes everything needed to run a piece of software, including the code, runtime, libraries, and configuration files.

• Portability: The package is portable and can be easily shared and deployed on different environments without any changes.
• Layered Architecture: Containers are built as layers of images stacked on top of each other.
• Efficiency: The base OS image is typically very small (e.g., Alpine Linux).
• Isolation: Containers provide isolation at the process level, ensuring that each container runs independently of others.

Managing Container

• Starting a Container: docker run -d myapp (Run a container in detached mode)
• Stopping a Container: docker stop <container_id> (Stop a running container)
• Removing a Container: docker rm <container_id> (Remove a stopped container)

Docker Container Management

Docker Compose

• Definition: Docker Compose is a tool for defining and running multi-container Docker applications. You use a docker-compose.yml file to configure your application's services.
• Starting Services: docker-compose up (Start and run the services defined in the Compose file)
• Scaling Services: docker-compose scale <service>=<number> (Scale the number of containers for a service)