Volumes, bind mounts and networking — Docker & Containers

4. Volumes, bind mounts and networking

Basic★ Must knowLesson 4 of 8

Storage	What	Use
Named volume	Managed by Docker (`docker volume create`)	Database data, persistent app data
Bind mount	Host folder mapped into the container	Source code during development, config files
tmpfs	In memory only	Secrets/temp data that must not touch disk

bash

docker run -d --name sql -e ACCEPT_EULA=Y -e MSSQL_SA_PASSWORD='<strong-password>' \
  -p 1433:1433 -v sqldata:/var/opt/mssql mcr.microsoft.com/mssql/server:2022-latest

docker network create shopnet
docker run -d --name api --network shopnet shop-api:1.0     # reachable as http://api:8080 by other containers on shopnet

Network drivers: bridge (default; user-defined bridges give DNS by container name), host (share host network stack), none, overlay (multi-host, Swarm), macvlan. -p 8080:80 publishes host port 8080 → container port 80.