Are container data deleted after it is stopped?

Container data by default is stored in its filesystem, which is temporary and isolated. When the container is stopped, its filesystem is preserved, but when the container is removed (docker rm), the data is deleted along with the container. If the container is simply stopped (docker stop), the data remains, and it will be accessible upon restarting the container.

To persist data beyond the container's lifecycle, volumes or mounting directories from the host are typically used. This allows data to be preserved independently of the container's state.

Example:

# Create and run a container with a volume
docker run -d --name mycontainer -v myvolume:/data busybox

# Stop the container
docker stop mycontainer

# Data in the volume myvolume will be preserved and accessible upon the next container start