Doker is multi-platform compatible software packaging tool, which is efficient way to roll out containerised applications

  • Web apps developers and ML engineers use dockers extensively for CI-CD

Docker

A Docker container image is a lightweight, standalone, executable package of software.

  • It includes everything needed to run an application: code, runtime, system tools, system libraries and settings.
  • containers - images become containers when they run on Docker Engine
  • Containers isolate software from its environment and ensure that it works uniformly despite differences for instance between development and staging.


Installation on windows 10 Home

Step 1 : System requirements

  • Ensure that you ae running Windows 10 home
    • As of Jan 2021, For x64 systems: Version 1903 or higher, with Build 18362 or higher.
  • To check version, start run mode: windows-R
  • Then type and enter: winver
  • Latest update for windows 10 home is available here

step 2. Install WSL

Go to WSL and Follow steps 1 - 5

Step 3.Download and install docker.exe

latest docker for windows 10 home can be found here


Getting started : CRUD operations

Create a container

launch you powershell / command prompt and create yuor environment.

  • open sourced docker images can be pulled from docker hub
  • The docker run command first creates a writeable container layer over the specified image, and then starts using it. 
    docker run -tid --name [my_Container_Name] [docker_image_url]
  • -t : Allocate a pseudo-tty
  • -i : Keep STDIN open even if not attached
  • -d : containers started in detached mode exit when the root process used to run the container exits

Start a container

docker start [my_container_name]

List all containers

Container information including container ID, IMAGE, status, ports, name etc is displayed

docker ps --all

List only container IDs

docker ps -aq

Stop a container

docker stop [my_container_name]

remove a container

Ensure that container is already stopped using preivous commands

docker rm [my_container_name]

stop all containers at once

To stop all containers are once, we can capture all container IDs into a shell variable and stop all containers in one go.

docker stop $(docker ps -aq)

remove all containers

Ensure that containers are already stopped using preivous commands

docker rm $(docker ps -aq)

Operate with container

Launch bash inside your linux based container

If insalled docker has a shell program [bash, mysql, mongo etc.] installed, it can launched as shown below.

docker exec -it [my_container_name] bash
  • docker run -i-t enables us to detach with TTY (in this case, Bash) wih ctrl-P ctrl-Q and reattached with docker attach
  • docker run -i → cannot be detached with ctrl-P ctrl-Q; will disrupt stdin
  • docker run → cannot be detached with ctrl-P ctrl-Q; can SIGKILL client; can reattach with docker attach

move files between docker container and local machine

docker cp [my_Container_Name]:/[path_to_myFile] ./[local_machine_path]