Docker Notes 3 container volumes and data

Data Volumes

docker container run -d -p 3307:3306 --name mysql_db -e MYSQL_RANDOM_ROOT_PASSWORD=True mysql

docker volume ls

docker volume inspect <id>

We can't say which volume is attached to which container

named volumes

docker container run -d -p 3307:3306 --name mysql_db1 -e MYSQL_RANDOM_ROOT_PASSWORD=True -v mysql_data:/var/lib/mysql mysql

docker container rm -f mysql_db1

docker container run -d -p 3307:3306 --name mysql_db2 -e MYSQL_RANDOM_ROOT_PASSWORD=True -v mysql_data:/var/lib/mysql mysql

docker volume ls

we can see only one volume with name `mysql_data`, so data is persistant.

Bind mounting

docker container run -d --name nginx -p 80:80 -v $(pwd):/usr/share/nginx/html nginx

then we can login to that container and see the all files.

Any changes in host location also reflects there without restart/reload (persistant)