Basic Docker Concepts and Terms:
Docker Image:
A lightweight, stand-alone, executable package that includes everything needed to run a
piece of software.
Docker Container:
A runtime instance of a Docker image.
Docker Hub: ☁️
A cloud-based registry service where Docker users and partners create, test, store, and
distribute container images.
Dockerfile: 📄
A text document that contains all the commands a user could call on the command line to
assemble an image.
Docker Compose: 🎶🐳
A tool for defining and running multi-container Docker applications.
Basic Docker Commands: 🔧🏁
Intermediate Docker Commands: 🛠🚀
Let's get started
docker --version: Display Docker version.
docker info: Display system-wide information.
docker run image: Run a Docker container from an image.
docker ps: List running Docker containers.
docker ps -a: List all Docker containers.
docker stop container_id: Stop a running container.
docker rm container_id: Remove a Docker container.
docker images: List Docker images.
docker rmi image_id: Remove a Docker image.
Dockerfile Commands: 🚢🛠
Docker Compose Commands: 🎶🐳🎵
Docker Networking: 🌐🔗
docker run -d image: Run a Docker container in detached mode.
docker run -p host_port:container_port image: Map a port from the host to a
container.
docker run -v host_volume:container_volume image: Mount a volume from the host to
a container.
docker run -e VAR=VALUE image: Set environment variables in a container.
docker inspect container_id/image_id: Return low-level information on Docker
objects.
docker build -t tag .: Build a Docker image with a tag from a Dockerfile in the current
directory.
docker tag image new_tag: Tag an image with a new tag.
FROM image: Set the base image.
RUN command: Run a command.
CMD command: Set a default command that will run when the container starts.
ENV VAR=VALUE: Set environment variables.
ADD source destination: Copy files from source to the container's filesystem at the
destination.
COPY source destination: Copy new files or directories from source and add them to
the filesystem of the container.
ENTRYPOINT command: Allow you to configure a container that will run as an
executable.
LABEL: Adds metadata to an image.
EXPOSE: Informs Docker that the container listens on the specified network ports at
runtime.
ENTRYPOINT: Allows you to configure a container that will run as an executable.
docker-compose up: Create and start containers.
docker-compose down: Stop and remove containers, networks, images, and volumes.
docker-compose build: Build or rebuild services.
docker-compose logs: View output from containers.
docker-compose restart: Restart services.
docker network ls: List networks.
docker network create network: Create a network.
docker network rm network: Remove a network.
Bridge: Docker's default networking driver.
Host: For standalone containers, removes network isolation between the container
and the Docker host.
Overlay: Networks connect multiple Docker daemons together and enable swarm
services to communicate with each other.
Macvlan: Assigns a MAC address to a container, making it appear as a physical device
on your network.
Docker Volumes: 🗄📁
Docker Object Commands: 📦🔨
Docker Advanced Commands: 🚀🛠
Docker System Commands: 💻🔍
Docker Swarm Commands: 🐝🚀
Container Orchestration with Docker Swarm: 🐝🎶🐳
docker volume ls: List volumes.
docker volume create volume: Create a volume.
docker volume rm volume: Remove a volume.
docker image: Manages images.
docker container: Manages containers.
docker network: Manages networks.
docker volume: Manages volumes.
docker secret: Manages Docker secrets.
docker plugin: Manages plugins.
docker history image: Show the history of an image.
docker save image > file: Save an image to a tar archive.
docker load < file: Load an image from a tar archive.
docker commit container image: Create a new image from a container's changes.
docker info: Displays system-wide information.
docker version: Shows the Docker version information.
docker system df: Shows Docker disk usage.
docker system events: Gets real-time events from the server.
docker system prune: Removes unused data.
docker swarm init: Initialize a swarm.
docker swarm join: Join a node to a swarm.
docker node ls: List nodes in a swarm.
docker service create image: Create a service.
docker service ls: List services in a swarm.
docker service rm service: Remove a service.
docker swarm: Manages Swarm.
docker node: Manages Swarm nodes.
docker stack: Manages Docker stacks.
docker service: Manages services.
Services: 🎶🐳
The definition of the tasks to execute on the manager or worker nodes.
Tasks: 🚀🔧
A single runnable instance of a service.
Docker Security: 🔒🛡
Docker Troubleshooting and Monitoring: 🐛🔧👀
Docker Registries and Repositories: 📦🔍🏛
Docker and CI/CD: 🛠🚀🔧
Worker nodes:
Nodes that receive and execute tasks dispatched from manager nodes.
Manager nodes:
The only nodes that can execute Docker commands or authorize other nodes to join the
swarm.
Raft Consensus Algorithm: 👑📜
Manager nodes use the Raft Consensus Algorithm to agree on task scheduling and status
updates.
Services scaling: 🔢🔧
In Docker Swarm mode, you can scale your services up or down for optimal resource
utilization.
docker secret create secret file: Create a secret from a file.
docker secret ls: List secrets.
docker secret rm secret: Remove a secret.
Docker Security Scanning: 🔍🛡
A security feature that you can use in Docker repositories.
Docker Content Trust: 🤝🔏
Provides the ability to use digital signatures for data sent to and received from remote
Docker registries.
Docker Secrets: 🤫🔐
Allows you to manage sensitive data, such as passwords, SSH private keys, SSL
certificates, and other data.
docker stats: Display a live stream of container(s) resource usage statistics.
docker system df: Display the space usage of Docker daemon entities.
docker inspect: Return low-level information on Docker objects.
docker events: Get real-time events from the server.
docker logs: Fetch the logs of a container.
docker healthcheck: Checks the health of a running container.
Docker Hub: ☁️📦
Docker's public registry instance.
Docker Trusted Registry (DTR): 🔒📦
Docker's commercially supported storage for Docker images.
Docker Content Trust (DCT): 🤝🔏📦
Provides the ability to use digital signatures for data sent to and received from remote
Docker registries.
Docker in Jenkins: 🔧🏭
Jenkins provides built-in Docker integration for CI/CD workflows.
Docker and the Cloud: ☁️🐳🚀
Docker Best Practices: 🛠🚀
Docker and Microservices: 🐳🔧🏭
Docker in Travis CI: 🔧🚂
Travis CI also provides Docker integration for CI/CD workflows.
Docker in GitLab CI: 🔧🏭
GitLab CI has native Docker support for CI/CD workflows.
Docker in CircleCI: 🔧🔄
CircleCI offers Docker support to build and push Docker images.
Docker in Azure DevOps: 🔧🏭🔧
Azure DevOps can build, push, or run Docker images, or run a Docker command.
Docker on AWS: 🌐🔧
AWS provides services like Amazon Elastic Container Service (ECS) and AWS Fargate for
running Docker containers.
Docker on Azure: 🌐🔧
Azure provides Azure Kubernetes Service (AKS) for running Docker containers.
Docker on Google Cloud: 🌐🔧
Google Cloud provides Google Kubernetes Engine (GKE) for running Docker containers.
Container immutability: 🧱🔒
The idea that you never update a running container; instead, you should always create a
new one.
Single process per container: 🚀🔧
Each container should address a single concern and do it well.
Minimize layer counts in Dockerfiles: 🔄🔨
The fewer commands that create layers, the smaller your image is likely to be.
Leverage build cache: 🏗🔍
Docker will cache the results of the first build of a Dockerfile, allowing subsequent builds
to be super fast.
Use .dockerignore: 🙈🔍
Prevents sending unnecessary files to the daemon when building images.
Use specific tags for production images: 🏷🚀
Using specific versions of an image ensures that your application consistently works as
expected.
Always use the latest version of Docker: 🔧🆕
Each new version of Docker includes security improvements, bug fixes, and new features.
Service discovery: 🔍🔭
Docker Swarm Mode has a built-in DNS server that other containers can use to resolve
the service name to an IP address.
Service scaling: 🔢🔧
In Docker Swarm Mode, you can scale your services up or down.
Load balancing: ⚖️🚀
Docker has a built-in load balancer that can distribute network connections to all
instances of a replicated service.
Docker Plugins: 🧩🔌
Docker API: 🚀📡
Docker Editions: 🎁🚀
Docker Architecture: 🏰🚀
Secure communication between services: 🔒📞
Docker Swarm Mode has a built-in routing mesh that provides secure communication
between services.
Storage Plugins: 🗄🔌
These plugins provide storage capabilities to Docker containers.
Network Plugins: 🔗🔌
These plugins provide networking capabilities to Docker containers.
Authorization Plugins: 🔏🔌
These plugins restrict the Docker APIs that can be accessed.
Docker REST API: 🔧📡
An API used by applications to interact with the Docker daemon.
Docker SDK: 🔧
SDKs for Go and Python, built on top of the Docker REST API.
Docker Engine API: 🔧📡
The API Docker clients use to communicate with the Docker daemon.
Docker Community Edition (CE): 🏠🐳
Ideal for individual developers and small teams looking to get started with Docker and
experimenting with container-based apps.
Docker Enterprise Edition (EE): 🏢🐳
Designed for enterprise development and IT teams who build, ship, and run businesscritical applications in production at scale.
Docker Engine: 🔧📡🖥
A client-server application with three major components: a server, a REST API, and a
command-line interface (CLI).
Docker Daemon: 👹🚀
Listens for Docker API requests and manages Docker objects such as images, containers,
networks, and volumes.
Docker Client: 📡
The primary way that many Docker users interact with Docker. When you use commands
such as docker run, the client sends these commands to dockerd, which carries them out.
Docker Images: 🖼🏞
The basis of containers. An Image is an ordered collection of root filesystem changes and
the corresponding execution parameters for use within a container runtime.
Docker Containers: 📦
A runnable instance of an image. You can create, start, stop, move, or delete a container
using the Docker API or CLI.
Docker Services: 🎶🐳🏭
Allows you to scale containers across multiple Docker daemons, which all work together
as a swarm with multiple managers and workers.
