Docker Real Time

Description

Docker is a software platform that allows you to build, test, and deploy applications quickly

Getting Started

Docker works by providing a standard way to run your code. Docker is an operating system for containers. Similar to how a virtual machine virtualizes (removes the need to directly manage) server hardware, containers virtualize the operating system of a server. Docker is installed on each server and provides simple commands you can use to build, start, or stop containers.

Dependencies

• An IDE (VScode preferred)
• Linux OS

Installing

• Follow instruction from https://docs.docker.com/engine/install

yum install docker

Get Familiar with Dockerfile

• Name of file should be with name Dockerfile, “D” should be capital letters, Docker components in the file should be capital letters only
• FROM: Which base image I want. This command must be on top of the docker file
• RUN: lets you execute commands while creating Docker image, it will create a layered image
• LABEL: Author/Owner/Description, MAINTAINER is deprecated
• COPY: Copy files from local system (docker VM), we need to provide source, destination. Used for copying from local file system, not from internet
  • COPY /source/file/path /destination/path
• ADD: like copy, download files from internet, also extract file at docker image side
  • ADD sourceFileUrl /destination/path
  • ADD /source/file/path /destination/path
  • ADD source.file.tar.gz /temp
• EXPOSE: to expose ports, such as port 8080 for tomcat and port 80 for Nginx etc.
• WORKDIR: To set working directory, so that once the container is created you are directly landed to this dir
• CMD: execute commands but after container creation, and inside container
• ENTRYPOINT: Like CMD but has higher priority over CMD, first commands will be executed by ENTRYPOINT only
• ENV: Environment variable
• ARG: Argument
• HEALTHCHECK : check the health of any resource to determine whether that resource is operating normally

Executing program

• How to run the program

docker run -td --name Container_Name Image_Name:optional_tag

Help

docker --help

Authors

Contributors names and contact info

@KAPIL0123

Version History

• 0.1
  • Initial Release

Acknowledgments

Inspiration, code snippets, etc.

• Begining with Docker
• Using SSH keys inside docker container
• Docker multi-stage builds

License

Free Software, Hell Yeah!