How to expand the file system in Linux when the disk grows?

Question

linux

Is there a way to expand an ext3 filesystem when a disk/LUN grows without rebooting and unmounting it?
In Windows, this is done elementarily - just click Extend Volume in diskmgmt.msc. For Linux, I have so far only come across crazy instructions with compound volumes (which are not supported by software for RK) through lvextend and a solution like "pdresize, lvresizre and expand the file system", but without a detailed description I could not use it.

Answer 1

The answer was found on the Internet:
unix.stackexchange.com/a/67107
And habrauser rekby wrote a wonderful utility to automate this difficult task:
habrahabr.ru/post/274451

Answer 2

You can increase it without unmounting it online, if we are talking about increasing the FS:
resize2fs /path/to/device

Answer 3

Instruction
To update without rebooting, after changing the size of the virtual disk, you must rescan the disk (get a new disk size). Something like this:
or
echo 1 > /sys/class/block/xxx/device/rescan

Answer 4

gparted - resize/move