what is docker voulme :-

Volumes are persistent data stores for containers, created and managed by Docker. You can create a volume explicitly using the docker volume create command, or Docker can create a volume during container or service creation.

exmple :-

When you ran your container without a volume:

docker run -it --rm storepythonapp:v1

• The file server.txt was stored inside the container’s filesystem.

• But every time you ran --rm, the container was deleted after exit.

• That means all data in the container (including server.txt) was lost.

• So, names you saved in one container would not persist in a new container unless you kept the same container alive.

That’s why when you reran without a volume, it only showed names saved within that container session.

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2️⃣ How Docker volumes help

When you run:

docker run -it -v puthonVolume:/app --rm storepythonapp:v1

• -v puthonVolume:/app mounts a persistent volume named puthonVolume to /app inside the container.

• Now, any file created inside /app (like server.txt) is saved in the volume.

• Even if you remove the container (--rm), the data in the volume remains.

So next time you run another container with the same volume:

docker run -it -v puthonVolume:/app --rm storepythonapp:v1

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Docker Bind

what is docker bind :-

A bind mount is a way to link a directory or file from your host machine to a directory inside a Docker container. Changes made in the container reflect on the host, and vice versa.

Use / Purpose:

• Persist data outside the container.

• Share files between host and container.

• Useful for development, so code changes on host are visible in the container immediately.

Example:

docker run -it -v /home/user/myproject:/app --rm storepythonapp:v1

• /home/user/myproject → host folder

• /app → container folder

• Now server.txt or any files created in /app are saved directly on the host.

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Refrence : - https://www.youtube.com/watch?v=OhnTMWmfTBE&t=7416s

https://docs.docker.com/engine/storage/volumes/