Mis juhtub Docker konteineri sees olevate andmetega, kui see peatatakse? Kas need kaovad?

Data inside a Docker container, stored in its filesystem (inside the container), by default disappear when the container is stopped and deleted. When the container is stopped, the data remains, but if the container is deleted, all changes in the container's filesystem will be lost.

To prevent data loss, Docker volumes or bind mounts are used — special mechanisms for storing data outside the container, on the host machine. This way, data is preserved regardless of the container's lifecycle.

Example of using a volume:

docker run -v mydata:/app/data myimage

Here, the data in the /app/data folder will be stored in the mydata volume and will not disappear when the container is stopped or deleted.