On Oct 9, 2018, at 6:42 AM, lejeczek via CentOS <centos@centos.org> wrote:
> 
> is there a way to add custom mount points at installation point?

Yes: tell the installer that you want to do manual partitioning.  Then you can 
create whatever partitioning scheme you like.

> And if there is would you say /usr should/could go onto a separate partition?

Once upon a time, yes, but not any more:

   https://unix.stackexchange.com/a/4194/138

A complete CentOS installation is in the single-digit gigs, which is smaller 
than even most removable media these days.  Even small embedded systems can get 
a useful Linux installation onto a single flash IC or whatever it is they use 
for mass storage.

When installing to a single volume, the only partitions I make these days are 
to provide storage space isolation, as a cheap alternative to setting up 
quotas, log rotation, etc.:

*  /var if you expect large log files, large MySQL DBs, large /var/www trees, 
etc.

*  /home if you want to prevent problems with the root disk if normal users end 
up filling that partition with files they create.

*  Network file shares for the same reason.

With filesystems featuring pooled/shared storage (ZFS, btrfs, APFS…) I tend to 
create only one partition, then rely on the filesystem’s quota feature if 
necessary to avoid such problems.

Even on single-volume systems without pooled storage, you can usually get away 
with a minimal partition scheme:

*  Small /boot (plus maybe /boot/efi and/or /biosboot)

*  swap partition

*  root for everything else

This is because modern Unix-type filesystems will will typically reserve the 
last 5% of the space for root only, so that normal users simply cannot fill a 
filesystem, so that the OS won’t crash due to system daemons being unable to 
write to the disk.
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