What does the engin docker do?

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Docker Engine is the core engine that acts as an open source container manager, like a system manager who turns your code and settings into a true running container.

What does the Docker Engine do?

Docker Engine uses a Client-Server architecture with three main components that work together:

1.Docker Daemon (processor name is dockerd)

This is the "heart" of the Docker Engine running behind the scenes (Background) on the Host OS (like your Ubuntu). Serves:

Manage Objects: Keep creating and controlling Images, Containers, Networks, and Volumes.

Resource Management: Contact the OS's Kernel to request the use of CPU and RAM to each container.

Security: Boundaries are blocked from interfering with each container.

2.REST API

It's a communication channel between the Daemon and an external program, like a "food counter" that tells you who wants the Docker to do.

3.Docker CLI (Command Line Interface)

Is the command you type in Terminal, such as docker building or docker run:

When you type a command, CLI sends that command through the REST API to tell Daemon to run.

Working Procedure (Workflow)

To visualize its functionality, check out an example when you run my server project:

Reading (Build): When you order the docker building, the Engine reads the Dockerfile line by line to create an Image (Blueprint Pad).

Store: It stores the image locally or extracts it from the Docker Hub.

Run: When you order a running docker or a compose docker, the Engine picks up the Image and "unfolds" it into a container that actually works.

Networking: The Engine creates a simulated IP for the container so that Nginx can talk to Node.js as you set it up.

Brief summary

If the container is a "cargo container."..Docker Engine is a "crane and dock operator" that lifts cabinets, places cabinets, checks security, and connects water pipes to make them work.