ReddRadar
Agent skill
docker-essentials
Essential Docker commands and workflows for container management, image operations, and debugging.
Install this agent skill to your Project
npx add-skill https://github.com/LeoYeAI/openclaw-master-skills/tree/main/skills/docker-essentials
Metadata
Additional technical details for this skill
- clawdbot
-
{ "emoji": "\ud83d\udc33", "requires": { "bins": [ "docker" ] } }
SKILL.md
Docker Essentials
Essential Docker commands for container and image management.
Container Lifecycle
Running containers
# Run container from image
docker run nginx
# Run in background (detached)
docker run -d nginx
# Run with name
docker run --name my-nginx -d nginx
# Run with port mapping
docker run -p 8080:80 -d nginx
# Run with environment variables
docker run -e MY_VAR=value -d app
# Run with volume mount
docker run -v /host/path:/container/path -d app
# Run with auto-remove on exit
docker run --rm alpine echo "Hello"
# Interactive terminal
docker run -it ubuntu bash
Managing containers
# List running containers
docker ps
# List all containers (including stopped)
docker ps -a
# Stop container
docker stop container_name
# Start stopped container
docker start container_name
# Restart container
docker restart container_name
# Remove container
docker rm container_name
# Force remove running container
docker rm -f container_name
# Remove all stopped containers
docker container prune
Container Inspection & Debugging
Viewing logs
# Show logs
docker logs container_name
# Follow logs (like tail -f)
docker logs -f container_name
# Last 100 lines
docker logs --tail 100 container_name
# Logs with timestamps
docker logs -t container_name
Executing commands
# Execute command in running container
docker exec container_name ls -la
# Interactive shell
docker exec -it container_name bash
# Execute as specific user
docker exec -u root -it container_name bash
# Execute with environment variable
docker exec -e VAR=value container_name env
Inspection
# Inspect container details
docker inspect container_name
# Get specific field (JSON path)
docker inspect -f '{{.NetworkSettings.IPAddress}}' container_name
# View container stats
docker stats
# View specific container stats
docker stats container_name
# View processes in container
docker top container_name
Image Management
Building images
# Build from Dockerfile
docker build -t myapp:1.0 .
# Build with custom Dockerfile
docker build -f Dockerfile.dev -t myapp:dev .
# Build with build args
docker build --build-arg VERSION=1.0 -t myapp .
# Build without cache
docker build --no-cache -t myapp .
Managing images
# List images
docker images
# Pull image from registry
docker pull nginx:latest
# Tag image
docker tag myapp:1.0 myapp:latest
# Push to registry
docker push myrepo/myapp:1.0
# Remove image
docker rmi image_name
# Remove unused images
docker image prune
# Remove all unused images
docker image prune -a
Docker Compose
Basic operations
# Start services
docker-compose up
# Start in background
docker-compose up -d
# Stop services
docker-compose down
# Stop and remove volumes
docker-compose down -v
# View logs
docker-compose logs
# Follow logs for specific service
docker-compose logs -f web
# Scale service
docker-compose up -d --scale web=3
Service management
# List services
docker-compose ps
# Execute command in service
docker-compose exec web bash
# Restart service
docker-compose restart web
# Rebuild service
docker-compose build web
# Rebuild and restart
docker-compose up -d --build
Networking
# List networks
docker network ls
# Create network
docker network create mynetwork
# Connect container to network
docker network connect mynetwork container_name
# Disconnect from network
docker network disconnect mynetwork container_name
# Inspect network
docker network inspect mynetwork
# Remove network
docker network rm mynetwork
Volumes
# List volumes
docker volume ls
# Create volume
docker volume create myvolume
# Inspect volume
docker volume inspect myvolume
# Remove volume
docker volume rm myvolume
# Remove unused volumes
docker volume prune
# Run with volume
docker run -v myvolume:/data -d app
System Management
# View disk usage
docker system df
# Clean up everything unused
docker system prune
# Clean up including unused images
docker system prune -a
# Clean up including volumes
docker system prune --volumes
# Show Docker info
docker info
# Show Docker version
docker version
Common Workflows
Development container:
docker run -it --rm \
-v $(pwd):/app \
-w /app \
-p 3000:3000 \
node:18 \
npm run dev
Database container:
docker run -d \
--name postgres \
-e POSTGRES_PASSWORD=secret \
-e POSTGRES_DB=mydb \
-v postgres-data:/var/lib/postgresql/data \
-p 5432:5432 \
postgres:15
Quick debugging:
# Shell into running container
docker exec -it container_name sh
# Copy file from container
docker cp container_name:/path/to/file ./local/path
# Copy file to container
docker cp ./local/file container_name:/path/in/container
Multi-stage build:
# Dockerfile
FROM node:18 AS builder
WORKDIR /app
COPY package*.json ./
RUN npm install
COPY . .
RUN npm run build
FROM nginx:alpine
COPY --from=builder /app/dist /usr/share/nginx/html
Useful Flags
docker run flags:
-d: Detached mode (background)-it: Interactive terminal-p: Port mapping (host:container)-v: Volume mount-e: Environment variable--name: Container name--rm: Auto-remove on exit--network: Connect to network
docker exec flags:
-it: Interactive terminal-u: User-w: Working directory
Tips
- Use
.dockerignoreto exclude files from build context - Combine
RUNcommands in Dockerfile to reduce layers - Use multi-stage builds to reduce image size
- Always tag your images with versions
- Use
--rmfor one-off containers - Use
docker-composefor multi-container apps - Clean up regularly with
docker system prune
Documentation
Official docs: https://docs.docker.com/ Dockerfile reference: https://docs.docker.com/engine/reference/builder/ Compose file reference: https://docs.docker.com/compose/compose-file/
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