Checking Docker Information

# Display Docker version
docker version

# Show detailed Docker system information
docker info

# Get help with Docker commands
docker --help

Image Operations

Image operations can utilize image names, full IDs, or shortened IDs.

Listing Images

# Show local images
docker images

# Include intermediate layers
docker images -a

# Display only image IDs
docker images -q

# Show all image IDs including intermediate layers
docker images -qa

# Show image digest information
docker images --digests

# Display complete image information
docker images --no-trunc

# Show creation history of specified image
docker history -H redis

Searching for Images

# Search for MySQL images in registry
docker search mysql

# Filter results by stars
docker search --filter=stars=600 mysql

# Show full description
docker search --no-trunc mysql

# Show only automated builds
docker search --automated mysql

Pulling Images

# Download latest Redis image
docker pull redis

# Download all Redis images
docker pull -a redis

# Download from private repository
docker pull bitnami/redis

Removing Images

# Remove single image
docker rmi redis

# Force removal
docker rmi -f redis

# Remove multiple images
docker rmi -f redis tomcat nginx

# Remove all local images
docker rmi -f $(docker images -q)

Building Images

# Create Dockerfile
cd /docker/dockerfile
vim mycentos

# Build image from Dockerfile
docker build -f /docker/dockerfile/mycentos -t mycentos:1.1

Container Operasions

Container operations can use container IDs or names.

Starting Containers

# Run container interactively
docker run -i -t --name mycentos

# Run container in background
docker run -d mycentos

Note: Containers may exit immediately when running in background. Docker requires a foreground process to keep containers running.

# Start stopped container
docker start redis

# Restart container
docker restart redis

Container Processes

# List processes in container
docker top redis

# Show processes for all running containers
for container in $(docker ps | grep Up | awk '{print $1}'); do echo && docker top $container; done

Container Logs

# View container logs
docker logs rabbitmq

# Follow logs with timestamps
docker logs -f -t --tail=20 redis

# View recent logs since specific date
docker logs --since="2019-05-21" --tail=10 redis

Entering and Exiting Containers

# Enter container during creation
docker run -it centos /bin/bash

# Exit and stop container
exit

# Detach from container (Ctrl + P + Q)

# Attach to existing container
docker attach --sig-proxy=false centos

# Open new terminal session in container
docker exec -i -t centos /bin/bash

# Execute command and show output
docker exec -i -t centos ls -l /tmp

# Execute command in background
docker exec -d centos touch cache.txt

Viewing Containers

# Show running containers
docker ps

# Show only running container IDs
docker ps -q

# Show all containers
docker ps -a

# Show file sizes
docker ps -s

# Show most recent container
docker ps -l

# Show last 3 containers
docker ps -n 3

# Show complete output without truncation
docker ps --no-trunc

# Inspect image metadata
docker inspect redis

# Get container IP address
docker inspect --format='{{range .NetworkSettings.Networks}}{{.IPAddress}}{{end}}' redis

Stopping and Removing Containers

# Stop running container
docker stop redis

# Kill running container
docker kill redis

# Remove stopped container
docker rm redis

# Force remove running container
docker rm -f redis

# Remove multiple containers
docker rm -f $(docker ps -a -q)
docker ps -a -q | xargs docker rm

# Remove network links
docker rm -l db

# Remove with volumes
docker rm -v redis

Volume Mounting

# Mount host directory to container
docker run -it -v /Desktop:/Desktop/container centos

# Mount as read-only
docker run -it -v /Desktop:/Desktop/container:ro centos

Creating Imagess from Containers

# Commit container to new image
docker commit -a="AuthorName" -m="Custom Redis" [redis-container-id] myredis:v1.1

Data Transfer Between Host and Container

# Copy from container to host
docker cp rabbitmq:/[container-path] [local-path]

# Copy from host to container
docker cp [local-path] rabbitmq:/[container-path]/

# Copy with path renaming
docker cp [local-path] rabbitmq:/[container-path]