Mastering DevOps Batch Lecture 13 Docker Storage & Networking Volumes, Bind Mount, tmpfs, Bridge
Welcome to Mastering DevOps Batch – Lecture 13 🚀
In this lecture, we explored Docker Storage and Networking concepts with hands-on practical examples.
You will learn how Docker manages container storage and how containers communicate with each other using Docker networks.
This is a very important topic for real DevOps environments, especially when running applications like databases, microservices, and distributed systems.
📦 Docker Storage Topics Covered
Non-Persistent Storage
✔ Default container writable layer
✔ Data loss when container is deleted
✔ tmpfs storage (memory-based storage)
Commands demonstrated:
docker container run -it --name mycon -d ubuntu
docker exec -it mycon mkdir /testdir
docker exec -it mycon touch /testdir/test.java
docker restart mycon
docker rm -f mycon
tmpfs example:
docker container run -it --name mycon --mount type=tmpfs,destination=/mydir -d ubuntu
docker exec -it mycon touch /mydir/temp.java
docker restart mycon
💾 Persistent Storage
Docker Volumes
We learned:
Creating volumes
Volume storage location
Attaching volumes to containers
Sharing volumes between containers
Read-only volumes
Commands demonstrated:
docker volume create demo-vol
docker volume ls
docker container run -it --name c2 --mount source=demo-vol,destination=/demo -d ubuntu
docker exec -it c2 touch /demo/demo.java
docker inspect c2
docker rm -f c2
Volume path in Linux:
/var/lib/docker/volumes/
Bind Mount
Bind mounts connect a host directory to a container directory.
Example:
mkdir mydir
docker container run -it --name c1 -v /home/raman/mydir:/demo -d ubuntu
docker exec -it c1 touch /demo/demo.java
Bind mount using --mount:
docker container run -it --name c1 --mount type=bind,source=/home/raman/mydir/,destination=/demo1 -d ubuntu
🌐 Docker Networking Concepts
We also covered Docker Networking fundamentals.
Docker provides multiple network types:
✔ Bridge (default)
✔ Host
✔ None
✔ Custom bridge networks
Default Bridge Network
Containers automatically connect to the bridge network.
docker network ls
docker run -it --name c1 -d centos:7
docker inspect c1
docker exec -it c1 ip a
Custom Docker Network
Creating a custom bridge network:
docker network create -d bridge webnetwork --subnet 192.168.0.0/16 --gateway 192.168.0.1
docker network inspect webnetwork
Running containers on custom network:
docker container run -it --name web -p 80:80 --network webnetwork -d ramansharma95/webapp
docker container run -it --name db --network webnetwork -d ramansharma95/mysql
Host Network
Container shares host network stack.
docker container run -it --name web --network host -d nginx
None Network
Container runs without network connectivity.
docker container run -it --name n1 --network none -d centos:7
Attach network later:
docker network connect bridge n1
🎯 What You Will Learn
✔ Docker storage architecture
✔ Persistent vs Non-Persistent storage
✔ Docker volumes
✔ Bind mounts
✔ tmpfs storage
✔ Docker bridge network
✔ Custom networks
✔ Host and none networks
✔ Container communication
🚀 Why This Lecture is Important
In real DevOps environments we use:
Docker volumes for databases
Bind mounts for development
Custom networks for microservices
Understanding Docker storage and networking is critical for Kubernetes and production deployments.
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