Cleaning root partition properly
I have some installations (SLES 12 SP3 or SP5) done on tiny disk (4GB with 3GB for / ), it's something "historical", inherited since many years.
I installed only needed packages : at first installation, space is enough, consuming "only" 72% of /.
Monthly, I propose an update: the first time / consumption rises to 74%, one month later to 79% and so on, month after month.
For each update, I make a 'zypper clean' to delete downloaded packages and reboot the server. There is no snapshot in snapper directory, tmp directory is almost empty (48K in my last example).
Is there any way to clean and free more space after some installations ? Or disk is just beginning too small ?