Docker - getting started (very basics)

Docker-Overview

Docker makes much easier to deploy applications. It helps to resolve one main problem - “works in my machine problem”. 

Getting started

• Download docker from here for your OS: 

• https://www.docker.com/community-edition#/download

• Install the docker DMG if Mac.

• Login to docker once it is installed. 

• Open terminal and execute the following: 
• Docker -version
• Docker run hello-world
• Docker run —name deiveehello hello-world
• Docker run -it —name mylinuc-container ubuntu bash

For a hands on video - click here

——————————————————————

Some basic docker commands

——————————————————————

Docker images // lists all images

Docker ps // lists all process

Docker run —help

———————————————————————

Running a docker using simple ubuntu image

———————————————————————

docker ps -a -f status=exited -q

docker rm $(docker ps -a -f status=exited -q)

docker run -it --name my-linuc-container-1 ubuntu bash

docker run -it --name my-linux-container1 --rm -v /Users/deiveehannallazhagappan/Documents/volumes/project1:/my-data ubuntu bash

Cd my-data

Touch aa.txt

Ls

———————————————————————

Creating image from a local docker file.

———————————————————————

• Create a docker file with the following content.

FROM ubuntu

CMD echo "Hello Deivee"

• Run the following command. 

docker $docker build -t deivee-tracker-image .

Sending build context to Docker daemon  2.048kB

Step 1/2 : FROM ubuntu

 ---> f975c5035748

Step 2/2 : CMD echo "Hello Deivee"

 ---> Running in 10c68c4eb454

Removing intermediate container 10c68c4eb454

 ---> b235e94e39b4

Successfully built b235e94e39b4

Successfully tagged deivee-tracker-image:latest

docker $docker images

REPOSITORY             TAG                 IMAGE ID            CREATED              SIZE

deivee-tracker-image   latest              b235e94e39b4        About a minute ago   112MB

ubuntu                 latest              f975c5035748        4 weeks ago          112MB

hello-world            latest              f2a91732366c        4 months ago         1.85kB

———————————————————————

Run the docker image

———————————————————————

docker $docker run deivee-tracker-image

Hello Deivee

docker $docker ps -a

CONTAINER ID        IMAGE                  COMMAND                   CREATED             STATUS                      PORTS               NAMES

9a65c141ec46        deivee-tracker-image   "/bin/sh -c 'echo \"H…"   5 seconds ago       Exited (0) 4 seconds ago                        optimistic_stonebraker

0e922f16f866        ubuntu                 "bash"                    12 minutes ago      Exited (0) 11 minutes ago                       tracker

be1311055d15        ubuntu                 "bash"                    23 minutes ago      Created                                         my-linux-container

77447d4d6c02        hello-world            "--name deiveehello"      12 hours ago        Created                                         elastic_wozniak

For a more hands on video on getting started with Docker, click here.
https://www.youtube.com/watch?v=hfL0USkCmZ0&t=305s