Start your adventure with docker
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The document discusses the importance of Docker for deploying applications by using containers, which help package apps along with their dependencies to ensure consistent performance across different environments. It outlines various scenarios where Docker can prevent conflicts arising from different software versions or configurations, emphasizing its advantages over traditional virtual machines. The document also provides basic commands for using Docker, examples of a Dockerfile, and mentions resources for further learning.
![Dockerfile
Make a Dockerfile
file and add this
code to there.
FROM node:10
# Create app directory
WORKDIR /usr/src/app
# Install app dependencies
# A wildcard is used to ensure both package.json
AND package-lock.json are copied
# where available (npm@5+)
COPY package*.json ./
RUN npm install
# If you are building your code for production
# RUN npm ci --only=production
# Bundle app source
COPY . .
EXPOSE 8080
CMD [ "node", "server.js" ]](https://image.slidesharecdn.com/startyouradventurewithdocker-200424210205/85/Start-your-adventure-with-docker-42-320.jpg)
Start your adventure with docker
- 2. WHY WE NEED DOCKER
- 3. WHY WE NEED DOCKER When comes to deploy app in server we have to install various resources or packages for the app configuration. On the other side you have another team build a app under node js, maybe you hire a freelancer who would make app by php but another version and so on …
- 4. If you install all of this requirement in a single server high chances for app crashes. But on the other hand, your developer might say it's all fault for the person who has responsible for deployment.
- 6. WHAT CAN IT DO
- 7. Docker is a tool designed to make it easier to create, deploy, and run applications by using containers. Containers allow a developer to package up an application with all of the parts it needs, such as libraries and other dependencies, and deploy it as one package. WHAT CAN IT DO
- 8. By doing so, thanks to the container, the developer can rest assured that the application will run on any other Linux machine regardless of any customized settings that machine might have that could differ from the machine used for writing and testing the code. Source: https://opensource.com/resources/what-docker WHAT CAN IT DO
- 9. It's like a virtual machine but really a virtual machine. Its virtualize the application using same kernel making isolated environment. How it can perform
- 10. OS KERNEL MACHINE 1 DOCKERIZE APP Container 1 Container 2 Container 3 Container 4
- 11. DROP THE INSTANCE WHEN YOU DON'T NEED IT
- 12. BUT I AM STILL CONFUSED WHY I NEED THIS Scenario 1 Maybe you have a which run php 5.5 and you have php 5.5 installed in your system. Suddenly your supervisor asks you to deploy a laravel 5.6 app which supports php 7.1 But you can’t update php version your existing might have stop working or your apache lib might stop working.
- 13. BUT I AM STILL CONFUSED WHY I NEED THIS Scenario 2 Maybe your application is not working with other application because both application share same network configuration, same port number etc
- 14. BUT I AM STILL CONFUSED WHY I NEED THIS Scenario 3 Maybe your DevOps team have little knowledge about code or the platform you used in your application.
- 15. BUT I AM STILL CONFUSED WHY I NEED THIS Scenario 4 Maybe DevOps team don't have that much time for deploying app from scratch.
- 16. BUT I AM STILL CONFUSED WHY I NEED THIS Above all of this problem scenario has one solution and that is docker.
- 17. OS KERNEL OS KERNEL MACHINE 1 MACHINE 2 MULTIPLE DOCKERIZE
- 18. Q1. So it's more like Virtual machine, right? If not what is the difference between docker and virtual machine. Ans. No, it's not like virtual machine. Discussion in next slide...
- 19. OS KERNEL MACHINE 1 VIRTUALIZE APP KERNEL KERNEL KERNEL OS OS OS OS
- 21. Let’s begin
- 23. > docker Basic If you run docker command. It will list all necessary command
- 24. > docker run <image_name> RUN To start image it start with docker run > docker run ubuntu Example
- 25. > docker run <image_name>:10 Version Also specify the version of the image > docker run node:10 Example
- 26. > docker run -it <image_name>:10 I/O You can use I/O by specify the -it > docker run -it ubuntu /bin/bash Example
- 27. > docker run -p 8080:8000 <image_name>:10 Port mapping You can use port mapping by specify port Local_port: Docker_port > docker run -it ubuntu /bin/bash Example
- 28. Volume mapping You can map volume to source code to container source code > docker run -p 3306:3306 mysql -v opt/dataDir:/var/lib/mysql
- 29. Volume mapping
- 30. > docker run -d -p 8080:8000 <image_name> Run app detach mode You will run application in background mode by using -d > docker run -d -p 8080:8080 web_app Example
- 31. > docker run <image_name> php artisan serve Run command inside image Run bash command after the image name > docker run web_app php artisan serve Example
- 32. > docker run -h Others option You can get others command by using --help after docker run > docker run -h Example
- 33. DOCKER FILE
- 34. What is docker file
- 35. It's like a instruction file for building image. Like if want to deploy an app, you have to run many bash command to install package and extensions.
- 36. It looks like this. Where all the instruction written. Also there have certain requirement for write this file. You can find this from HERE Dockerfile
- 37. DOCKER COMPOSE
- 38. Docker Compose By docker compose you can write multiple services. Also you can easily link one service to another service. Learn more about docker compose from here. Also if confused about Docker compose and Dockerfile Click here for more detailed information.
- 39. LETS DEPLOY A APP USING DOCKER
- 40. package.json Make a package.json file and add this code to there. { "name": "docker_web_app", "version": "1.0.0", "description": "Node.js on Docker", "author": "First Last", "main": "server.js", "scripts": { "start": "node server.js" }, "dependencies": { "express": "^4.16.1" } }
- 41. server.js Make a server.js file and add this code to there. 'use strict'; const express = require('express'); // Constants const PORT = 8080; const HOST = '0.0.0.0'; // App const app = express(); app.get('/', (req, res) => { res.send('Hello World'); }); app.listen(PORT, HOST); console.log(`Running http://${HOST}:${PORT}`);
- 42. Dockerfile Make a Dockerfile file and add this code to there. FROM node:10 # Create app directory WORKDIR /usr/src/app # Install app dependencies # A wildcard is used to ensure both package.json AND package-lock.json are copied # where available (npm@5+) COPY package*.json ./ RUN npm install # If you are building your code for production # RUN npm ci --only=production # Bundle app source COPY . . EXPOSE 8080 CMD [ "node", "server.js" ]
- 43. Build image Build image by running this command docker build -t node-web-app .
- 44. Build image Run app detach mode with map port 49160 docker run -p 49160:8080 -d node-web-app node server.js
- 45. More useful link ● https://kodekloud.com/ ● https://www.youtube.com/watch?v=wi-MGFhrad0&list=PLhW3qG5bs-L99pQsZ74f-LC- tOEsBp2rK ● https://medium.com/free-code-camp/a-beginner-friendly-introduction-to-containers-vms-and- docker-79a9e3e119b ● https://medium.com/@cramirez92/build-a-nodejs-cinema-microservice-and-deploying-it-with- docker-part-1-7e28e25bfa8b ● https://docs.docker.com/get-started/ ● https://www.youtube.com/watch?v=DgoKjlDteEA&list=PLea0WJq13cnDsF4MrbNaw3b4jI0GT9yKt