DevOps Classroom notes 01/Jul/2025

Docker Volumes

• Docker volumes have a life time independent of docker container.
• Volumes act as mount onto a specific folder(s) in a container
• Docker volumes and Refer Here for the article
• Types:
  • Volumes:
    • Create a volume which gets create in /var/lib/docker
    • And mount the volume to a folder in container.
  • Bindmounts:
    • Mount an existing folder on dockerhost into container.
  • tmpfs
• Lets create a simple alpine container with a bindmount (/home/Dell/docs -> /docs)

docker container run -d --name bindmountdemo -v /home/Dell/docs:/docs alpine sleep 1d

• execute experiment commands commands such as (Watch classroom video)
  • df -h
  • ls
  • cat

Lets use the volume

• Create a volume

docker volume create --help

• We can create volume by default even if the user doesnot create a volume that is by adding VOLUME instruction in Dockerfile.

FROM alpine
RUN mkdir /docs
VOLUME /docs
CMD ["sleep", "1d"]

• Watch classroom recording for mysql

Docker networking

• Docker has two major types of networking
  • single host (developer setup)
  • multi host (docker swarm): This is not an area of interest for us as we will be exploring kubernetes for multi host .
• Network also is implemented as a driver Refer Here
• Port Forwarding.