Docker Essential | Notion Blog

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I. Introduction to Web Applications:

A web (based) application is any program that is accessed over a network connection using HTTP, rather than existing within a device’s memory

Performance – Speed – Accessibility – Security – Cost – Scalability

Build your app

Pack it for shipping

Host or run the app

II. Creating Simple Web Application:

Demo: Making a Webapp

Ubuntu 16.04

paste the 2 line in the end of the file then save the file and exit nano:

http://localhost:80

“Containers are an abstraction at the Application layer that packages codes and dependencies together”

Containers:

. Consume less storage and memory

. Easier and faster to ship

. If they work on one machine, they work on all machines

. Cost efficient and easy to scale

. Possible to eliminate data loss and downtime

who are using containers:

Google expedia paypal gsk pokemon go

“Docker is an open platform for developers and system admins to build, ship and run containerized applications”

Docker:

. Most widely used containerization platform

. Huge community support

. Large amount of 3rd party application support

. Works on Windows and Mac too

Install docker on linux

Demo: 1st application with Docker

Docker architecture and Docker files

Docker Engine Architecture

Demo: Write your Dockerfile (Fundamental Instructions)

pwd

tree -L 1

tree -l -d

cd CC_Docker/S2/D-1

touch Dockerfile

nano Dockerfile

Docker build -t img_from .

docker images

Demo2:

cd /home/username/CC_Docker/S2/D-2

touch Dockerfile

nano Dockerfile

docker build -t img_run-env .

docker run -ith —name cont_run-env img_run-env

docker ps -a

docker exec -it cont_run-env bash

ls

echo $USER

echo $SHELL

echo $LOGNAME

cd /home

ls

exit

Demo: Write your Docker file (Expose Instruction)

cd CC_Docker/S2/D-6

ls

touch Dockerfile

nano Dockerfile

docker build -t img_expose .

docker images

docker run -itd -rm -name cont_expose -p 8080:80 img_expose

docker ps -a

Note for the upcoming Apache demo Hello everyone!

So, in the previous lecture, we containerized Nginx web-server and ubuntu as the runtime environment for it. We exposed the Nginx container’s port 80 and mapped it with Docker host’s port 8080.

Our container is still serving on the host port 8080.

Now, in order to run our Apache container successfully, we need to free up port 8080 for course continuity purposes.

Use the following command to do so:

docker container stop cont_expose

Note: This updated text has been added as a result of multiple student queries.

Happy Learning:)

Demo: Containerize Apache Web-Server

cd CC_Docker/S2/D-7

ls

touch Dockerfile

nano Dockerfile

docker build -t img_apache .

docker run -itd —name cont_apache -p 8080:80 img_apache

Docker Images and Containers

3.1 Introduction to Docker Images

3.2 Demo: Docker Hub Walkthrough

Go to https://hub.docker.com

Create an account

3.3 Demo: Working with Docker Images | Search, List, Push, Pull

docker search python:3.6

docker search registry

docker search --filter "is-official=true" registry

docker search --format "table {{.Name}}\t{{.Description}}\t{{.IsOfficial}}" registry

docker images / docker image ls

docker images ubuntu

docker images ubuntu:16.04

docker images --no-trunc ubuntu:16.04

docker image pull nginx:latest

docker image pull nginx:alpine

docker images nginx

docker image pull --all-tags nginx

Navigate back to Docker Hub ⇒ Create Repository (make a repo and push image to it)

Namespace: same as user name

Repository name: repo-nginx

Short Description: This is nginx repo created and maintained by …

Full Description:

Visibility: public / private (Docker offers 1 private repo and unlimited public repo with free Docker hub account)

docker login -u dpham1989

dckr_pat_ESJ2tcZuyGLTLX9BFWCjaFwkjx8

docker tag nginx:latest dpham1989/repo-nginx:cc-nginx

docker images

docker image push dpham1989/repo-ngninx:cc-nginx

check on docker hub

3.4 Demo: Know your Docker Image | Inspect and History

3.5 Demo: Pruning and Removing Images

3.6 A Container is born!

3.7 Demo: Container Run Vs Create

3.8 Demo: Working with Containers | Start, Stop and Rename

3.9 Demo: Attach and execute commands on a running container