Monitor or watch an rsync process
strace -e open $(ps -o lwp= -LC rsync | sed 's/^/-p/')
or to see what files the process has opened.
lsof -ad3-999 -c rsync?
E-mail Spoofing and Prevention
TL;DR: No, Sender Policy Framework (SPF) won't fix all your spoofing problems and DKIM by itself will prevent nothing.
Expand Logical volume in Linux LVM
LVM makes it easy to resize volumes in Linux. This can be done without unmounting drives or requiring a restart.
First determine the free space of the group volume.
vgdisplay
Determine the path to the logical volume.
lvdisplay
Expand the logical volume into the group volume. You can specify a size (M for Megabytes, G for Gigabytes, T for Terabytes) …
lvextend -L+19G /dev/ubuntu-vg/ubuntu-lv
or you can expand the logical volume into the remaining free space.
lvextend -l +100%FREE /dev/ubuntu-vg/ubuntu-lv
You will get a success message similar to the screenshot below after the task is completed.
Resize the partition to use the newly expanded logical volume
resize2fs /dev/ubuntu-vg/ubuntu-lv
Install PowerDNS with PowerDNS-Admin
There are several places where you will need to choose a custom value, such as password. Please keep that in mind.