resize - shrink vmdk in vmware

here:

increasing disk size 

shrink disk size

note: always test first ini non production server.

How To Resize And Create Partitions With Gnome Partition Editor (GParted) - linux

here :

How To Resize And Create Partitions With Gnome Partition Editor (GParted)

test first in non production server.

resource files for sysadmin

here from linux user group .ph :

Pinoy Linux - resource files for sysadmin

securing fresh install centos 7

here for guideline:

Securing fresh install centos 7

always check &test for configuration after change configuration

Opensource sysadmin Library

Please check here :

Open Source SysAdmin Resources

many list of resource stuff that you may need.

free or Opensource Desktop management software

 1. Chocolatey - https://chocolatey.org
 2. just-install - https://just-install.github.io/
 3. WAPT - https://www.tranquil.it/en/price/
 4. Opsi - https://www.opsi.org/
 5. WPKG - https://wpkg.org/
 6. desktop central free edition
 7. PDQ Deply

please test which ne suit for your need.
popularity comparison check in here:
https://sysadmin.libhunt.com/categories/1967-client-management