Docker 101
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This document provides an introduction and overview of Docker. It discusses the motivation for using Docker, which includes only needing to build an app once and getting consistency between testing and production environments. It then provides instructions for installing Docker on different operating systems. Several Docker concepts and terms are defined, like images, containers, the Docker engine, Docker Hub, repositories, and more. Basic Docker commands are listed and explained. The Dockerfile is introduced as a way to build images. Key Dockerfile commands are defined. Docker Compose is presented as a tool to run complex multi-container apps with one command. Common Docker commands are provided at the end.
Docker 101
- 1. Docker 101
- 2. Mirza Nafis Faysal Software Engineer, Furqan Software github.com/NafisFaysal twitter.com/NafisFaysalMir
- 3. Motivation ● You only have to build the app once. Because a Docker app runs inside a container, and the container can run on any system with Docker installed, there is no need to build the app and configure it for multiple types of hardware platforms or operating systems where it will run. You only have to build it once for Docker. ● ● You get greater consistency between testing environments and production environments. When doing development with Docker, you test your app inside a container, and you ship it inside a container. That means the environment in which you test is identical to the one in which the app will run in production. As a result, developers can have much more confidence that end users won't experience problems that the QA team missed when it was testing the app. Session 1
- 4. Installing Docker on X Y Z -OS Super Simple : https://docs.docker.com/docker-for-mac/install/ https://docs.docker.com/engine/installation/linux/doc ker-ce/ubuntu/
- 6. Docker.com Says Docker is an open platform for developers and sysadmins to build, ship, and run distributed applications.
- 9. Fancy Docker Terminology Docker Image Docker Container Docker Engine Docker Hub Session 2
- 10. Docker Git Image saved state Commit Container used for local execution Checkout Repository collection of commits Repository Docker Hub popular remote server Github
- 12. $ docker pull $ docker images $ docker run –d –p –-name COMMAND $ docker ps $ docker stop containerName (or <container id>) $ docker rm containerName (or <container id>)
- 13. Dockerfile Series of commands to build an image
- 14. Command Description ADD Copies a file from the host system onto the container CMD The command that runs when the container starts ENTRYPOINT FROM The base image to use in the build. This is mandatory and must be the first command in the file. ENV Sets an environment variable in the new container EXPOSE Opens a port for linked containers MAINTAINER An optional value for the maintainer of the script ONBUILD A command that is triggered when the image in the Dockerfile is used as a base for another image RUN Executes a command and save the result as a new layer WORKDIR Set the default working directory for the container
- 15. Docker Compose : Get an app running in one command. Session 3
- 16. ‘’Compose is a tool for defining and running complex applications with Docker. With Compose, you define a multi-container application in a single file, then spin your application up in a single command which does everything that needs to be done to get it running.’’
- 17. long story short
- 18. MOST COMMON DOCKER COMMANDS Stop all containers: docker kill $(docker ps -q) Remove all containers: docker rm $(docker ps -a -q) Remove all docker images: docker rmi $(docker images -q) container's IP address: docker inspect -f '{{range.NetworkSettings.Networks}}{{.IPAddress}}{{end}}' container_name_or_id
- 19. Question ?
- 20. Happy Weekend