jatinkc / docker-data-persistence

How data persistence works in Docker containers using Volumes

Data-Persistence-in-Docker

> Create a Volume

docker volume create testvolume

> List all the volumes present locally

docker volume ls

> Run a container with attached volume

Here we are are attaching volume testvolume with a folder named app using nginx:latest image

docker run -d --name voldemo -v testvolume:/app nginx:latest

> Let's connect to our container using bash

docker exec -it voldemo bash

> Let's create a file in app folder using nano

apt update
apt install nano
cd app
nano test.txt

Once the nano editor opens up, add the below content or whatever you want

Hello World! Welcome to the test file!! 

Now save the file using ctrl+x then press y and Enter

> Now Stop and Remove the nginx container

docker stop voldemo
docker rm voldemo

> Now run the container again and see whether the data still exists or not

docker run -d --name voldemo -v testvolume:/app nginx:latest

> Let's connect to our container using bash

Again, check if the data still exists or not

docker exec -it voldemo bash

ls
cd app
cat test.txt