How to Start Docker: Simple Steps to Run Docker Engine

To start Docker, run the sudo systemctl start docker command on Linux or launch the Docker Desktop app on Windows/Mac. Verify it is running with docker info or docker version.

Syntax

Starting Docker depends on your operating system. On Linux, use the system service manager. On Windows or Mac, use the Docker Desktop application.

• sudo systemctl start docker: Starts the Docker service on Linux.
• docker info: Checks if Docker is running and shows system info.
• docker version: Shows Docker client and server versions.

bash

sudo systemctl start docker

docker info

docker version

Example

This example shows how to start Docker on a Linux system and verify it is running by checking Docker info and version.

bash

sudo systemctl start docker

docker info

docker version

Output

Client:
 Context:    default
 Debug Mode: false

Server:
 Containers: 0
  Running: 0
  Paused: 0
  Stopped: 0
 Images: 0
 Server Version: 24.0.2
 Storage Driver: overlay2
 ... (other info)

Client:
 Version:           24.0.2
 API version:       1.46
 Go version:        go1.20.6
 Git commit:        123abc
 Built:             Thu Jun  1 12:00:00 2024
 OS/Arch:           linux/amd64
 Experimental:      false

Common Pitfalls

Common mistakes when starting Docker include:

• Not running the start command with sudo on Linux, causing permission errors.
• Trying to use Docker commands before the service is started.
• On Windows/Mac, forgetting to open Docker Desktop app or waiting for it to fully start.
• Not having Docker installed or configured properly.

Always check Docker status with sudo systemctl status docker on Linux or the Docker Desktop icon on Windows/Mac.

bash

sudo systemctl start docker  # Correct way on Linux

# Wrong: docker info  # Fails if Docker not started

Quick Reference

Summary tips to start Docker:

• Linux: Use sudo systemctl start docker to start the service.
• Windows/Mac: Open Docker Desktop app and wait for it to initialize.
• Verify with docker info or docker version.
• Check service status with sudo systemctl status docker on Linux.

Key Takeaways

Start Docker on Linux with 'sudo systemctl start docker' to run the Docker engine.

On Windows and Mac, launch the Docker Desktop app to start Docker.

Verify Docker is running using 'docker info' or 'docker version' commands.

Always check Docker service status if commands fail to connect.

Use 'sudo' on Linux to avoid permission errors when starting Docker.