# Docker

> Run Docker commands within a container environment, including starting the Docker daemon and managing containers. Use when building, running, or managing Docker containers and images.

- Skill: `openhands/docker` (Agent Skill, multi-file: 5 files)
- Install (CLI): `npx skillmds add openhands/docker`
- Raw SKILL.md: https://api.skillmd.com/api/skills/openhands/docker/raw
- Safety review: pending
- Works with: Claude Code, Claude.ai, OpenAI Codex
- Category: DevOps & Infra
- Author: openhands (https://skillmd.com/u/openhands)
- Updated: 2026-09-09
- Page: https://skillmd.com/skills/openhands/docker

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# Docker Usage Guide

## Starting Docker in Container Environments

Please check if docker is already installed. If so, to start Docker in a container environment:

```bash
# Start Docker daemon in the background
sudo dockerd > /tmp/docker.log 2>&1 &

# Wait for Docker to initialize
sleep 5
```

On Windows, start Docker Desktop or the Docker service instead of running `sudo dockerd`; then run Docker commands from PowerShell without `sudo`.

## Verifying Docker Installation

To verify Docker is working correctly, run the hello-world container:

```bash
sudo docker run hello-world
```

PowerShell equivalent after Docker Desktop is running: `docker run hello-world`.