Docker For Beginners

Docker is an open platform for developing, shipping, and running applications. It enables you to separate your applications from your infrastructure so you can deliver software quickly. With this, you can manage your infrastructure in the same ways you manage your applications. By taking advantage of Docker’s methodologies for shipping, testing, and deploying code quickly, you can significantly reduce the delay between writing code and running it in production.

The way Docker works

It uses a client-server architecture. The Docker client talks to the Docker daemon, which does the heavy lifting of building, running, and distributing your Docker containers. The Docker client and daemon can run on the same system, or you can connect a Docker client to a remote Docker daemon. The Docker client and daemon communicate using a REST API, over UNIX sockets or a network interface.

Docker Installation

Click here and create your own Docker Hub account and download your machine’s operating system supported docker and install in your local machine.

Check docker version after installation

docker -v

Docker Commands

docker help

So it will return all docker commands but some usual common docker commands given below – 

Verify your Networks

networetwork ls

Start docker containers 

docker-compose up or docker-composer up -d

Stop and remove our docker container

docker-compose down

Create our Docker image from our Dockerfile

docker build --tag my_http

Show the running containers

docker ps

Stopping a running container

docker stop CONTAINER_ID

Stop all running container

docker container stop $(docker container ls -aq)Code language: JavaScript (javascript)

Delete all running containers

docker container rm $(docker container ls -aq)Code language: JavaScript (javascript)

Delete docker image

docker rmi IMAGE_ID

Create Docker file

FROM nginx
COPY html /usr/share/nginx/html

Create Docker image from the Dockerfile

docker build --tag my_http_server

Check the image has been created

docker images

Run our docker image on port 8080

docker run -d -p 8080:80 --name my_http_serverCode language: CSS (css)

 Check my docker is running?

http://localhost:8080Code language: JavaScript (javascript)

Stop running container 

docker stop CONTAINER_ID

Find the running image ID

docker images

Remove the running image ID

docker rmi my_http

If removal fails force the removal

docker rmi my_http –force

Create php Docker file and image build from it

Create php Docker file

FROM php:7.2-cli
COPY ./src /usr/src/myapp
WORKDIR /usr/src/myapp
CMD [ "php", "./docker_index.php" ]Code language: JavaScript (javascript)

 Create our Docker image from my php Dockerfile

docker build -t run-php

 Run my docker image which should have copied a local file called docker_index.php

docker run -it --rm --name run-app run-php

Create php Dockerfile

FROM php:7.2-apacheCode language: CSS (css)

Create my docker-compose file

version: "3" services:
    www:
        build: .
        ports:
            - "8080:80" volumes:
            - ./src:/var/www/html/
        networks:
            - defaultCode language: JavaScript (javascript)

 Start my docker container from docker-compose file

docker-compose up

or

docker-compose up - d    // detached mode

Note: if there is some help needed for install to create docker image then feel free to contact ixora solution.