Basic Docker

Os-level Virtualization Container Management

1. Introduction

Docker is a set of platform as a service (PaaS) products that use OS-level virtualization to deliver software in packages called containers. It is an open platform for developing, shipping, and running applications. Docker enables you to separate your applications from your infrastructure so you can deliver software quickly. With Docker, you can manage your infrastructure in the same ways you manage your applications.

2. Prerequisites

There is some requirements that we need to know before getting to know more about docker

• Know some of Linux command line
• Basic knowledge about virtual server (vagrant ..)

3. Architecture Design

• Container : is a virtualization run-time environment where users can isolate applications from the underlying system
• Image : it is the source of application which is already build for installing or running
• Registry : it is remote repository for storing docker image (nexus, dockerhub, aws ecr (elastic container registry)…)

4. Basic Command

Below is some of basic important command docker

• List Containers

docker ps

# your can add available [OPTIONS] below

docker ps -aq

# only shows IDs

[OPTIONS] : https://docs.docker.com/engine/reference/commandline/ps/

— all

# or -a Show all containers (default shows just running)

— filter

# or -f Filter output based on conditions provided

— format

# Pretty -print containers using a Go template

Example:

• Stop Container

docker stop CONTAINER_ID

# copy container id from docker ps

docker stop $(docker ps -aq)

# stop all Running containers

Example:

stop container

• Remove Container

docker rm CONTAINER_ID

# Delete Specific container

docker rm $(docker ps -aq)

# Remove all container

Example:

remove docker container

• List Image

docker images

# List all available images in your machine.

docker image ls -aq

# list image ids only

Example:

list images

list only image id

• Build Image

docker image build -t IMAGE_NAME(repo):BUILD_NUMBER(tag) .

# build image based on docker file in Current directory (.)

• Run Image

Example:

docker run — name laravel-app -p 8000:8000 kimly/laravelapp:latest

• Run Command inside Running Container or enter your container

docker container exec -it container_id or name bash or sh

Example :

• docker container exec -it 1aa5b15c26ff bash
• docker container exec -it laravel-app sh

5. Installation

Ubuntu Server

Install using the repository

1. Update the apt package index and install packages to allow apt to use a repository over HTTPS:

$ sudo apt-get update

$ sudo apt-get install \

apt-transport-https \

ca-certificates \

curl \

gnupg-agent \

software-properties-common

2. Add Docker’s official GPG key:

$ curl -fsSL https://download.docker.com/linux/ubuntu/gpg | sudo apt-key add -

Verify that you now have the key with the fingerprint 9DC8 5822 9FC7 DD38 854A E2D8 8D81 803C 0EBF CD88, by searching for the last 8 characters of the fingerprint.

$ sudo apt-key fingerprint 0EBFCD88

3. Use the following command to set up the stable repository. To add the nightly or test repository, add the word nightly or test (or both) after the word stable in the commands below.

$ sudo add-apt-repository \

“deb [arch=amd64] https://download.docker.com/linux/ubuntu \

$(lsb_release -cs) \

stable”

$ sudo apt install docker.io

root@testserver:~# docker — version

Docker version 19.03.6, build 369ce74a3c

More detail: Link : https://docs.docker.com/engine/install/ubuntu/

Mac Os

follow this link : https://docs.docker.com/docker-for-mac/install/

Finally, thank you for your time reading this article, I hope it can give you some new knowledge.

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