KVM20: Golden Image

# In The Name Of Allah .
# -- --- ---- -- ----- -
# Thu Nov 19 14:20:52 2020
# Written By : zer0err0r .
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# 20, CentOS Template[Golden, Sealed] Image .
  = The idea is to create a clean centos VM so you can test your services on it without getting interrupted .
  = There are many steps to do, We will see here the most important one .
  = First of all, Change into [root], Then :

  # Keep the [root] and remove all other users :
    $ userdel -r zer0err0r

  # Update the system :
    $ dnf update -y

  # Put SELinux in the permissive mode :
    $ vim /etc/selinux/config
      SELINUX=permissive

  # Disable the firewall :
    $ systemctl stop firewalld
    $ systemctl disable firewalld
      
  # Set the machine name into the standard :
    $ hostnamectl set-hostname localhost.localdomain

  # Clean your dnf temporary files :
    $ dnf clean all

  # Remove other temporary files :
    $ rm /var/tmp/* /etc/ssh/*key*
    $ rm ~/.ssh

  # Clear your command history :
    $ unset HISTFILE
    $ rm /root/.bash_history /root/anaconda-ks.cfg

  # Remove [UUID, HWADDR] from the NIC :
    $ vim /etc/sysconfig/network-scripts/ifcfg-eth0

  # Clear [/var/log/] files :
    $ for i in $(find /var/log/ -type f); do cp /dev/null $i; done

  # Execute the following [I forgot what they are about] :
    $ touch /root/.unconfigured
    $ rm /etc/udev/rules.d/70-*


  # Finally :
    = Shutdown and export the system for backup .
    = Then clone it everytime you wanted to test something .

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# Peace Be Up0n Muhammed .