ubuntu - linux, what process is loop0 that takes up so much CPU?

Question

I used dockr to install a mail server for my own use. Then I looked at top and I was scared to death. Before, the load was more than 0 points.

Answer 1

In Unix-like operating systems, a loop device, vnd (vnode disk), or lofi (loopback file interface) is a pseudo-device that makes a file accessible as a block device.

It looks like your disk is under too much pressure.

Take a look with iotop.