#Day 19 Task of #90DaysofDevops challenge🚀

let's start 🚗

Docker-Volume

Docker allows you to create something called volumes. Volumes are like separate storage areas that can be accessed by containers. They allow you to store data, like a database, outside the container, so it doesn't get deleted when the container is deleted. You can also mount from the same volume and create more containers having the same data.

Docker Network

Docker allows you to create virtual spaces called networks, where you can connect multiple containers (small packages that hold all the necessary files for a specific application to run) together. This way, the containers can communicate with each other and with the host machine (the computer on which the Docker is installed). When we run a container, it has its own storage space that is only accessible by that specific container. If we want to share that storage space with other containers, we can't do that.

Task-1

• Create a multi-container docker-compose file that will bring UP and bring DOWN containers in a single shot ( Example - Create application and database container )

steps :

create docker-compose file

commands :

vim docker-compose.yml

inside vim editor :

version: '3.8'

services:

my-web-app:

container_name: notes-app

build: .

ports:

- 8000:8000

volumes:

- notes_app_volume:/app

mysql-database:

container_name: mysql-db

image: mysql:8.0

ports:

- 3306:3306

environment:

MYSQL_ROOT_PASSWORD: "test@123"

my-nginix-server:

container_name: nginx-server

image: nginx:latest

ports:

- 80:80

volumes:

notes_app_volume:

Use the docker-compose up command with the -d flag to start a multi-container application in detached mode.

docker-compose up -d

Use the docker-compose ps command to view the status of all containers, and docker-compose logs to view the logs of a specific service.

docker-compose ps

docker-compose logs

Use the docker-compose down command to stop and remove all containers, networks, and volumes associated with the application

Task-2

Learn how to use Docker Volumes and Named Volumes to share files and directories between multiple containers.

create docker volumes :

docker volume create --name notes-app2-volume --opt type=none --opt device=/home/ubuntu/volumes/notes-app --opt o=bind

check the list of volumes:

docker volume ls

docker inspect

docker inspect notes-app2-volume

Create two or more containers that read and write data to the same volume using the docker run --mount command.

Verify that the data is the same in all containers by using the docker exec command to run commands inside each container.

Use the docker volume ls command to list all volumes

Use the docker volume rm command to remove the volume when you're done

Thank you very much for giving your valuable time for reading this article !!☺😊

Arijit Manna