In this case, data is only visible inside the Docker containers and is not from the host system. The data is lost if the container is shut down or the Docker host dies. This case mostly works with services that are packaged in Docker containers and are not dependent on persistent data when they return:

$ docker run -it ubuntu:14.04 
root@358b511effb0:/# cd /tmp/ 
root@358b511effb0:/tmp# cat > hello.txt 
hii 
root@358b511effb0:/tmp# ls 
hello.txt 

As seen in the preceding example, the hello.txt file only exists inside the container and will not be persisted once the container dies:

Data stored inside Docker Container