CentOS 7 Installation

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  • Hyper-V: Do not use virtual RAM when booting from CD / DVD, it will cause a Kernel Panic
  • Bash Prompt (something actually useful): /etc/bashrc: [ "$PS1" = "\\s-\\v\\\$ " ] && PS1="[\w]\\$ "
  • Disable SELINUX:/etc/selinux/config, set SELINUX to disabled, sestatus to check status AND /boot/efi/EFI/centos/grub.cfg, edit first line that starts with "linux..." and ends with a UTF setting, add selinux=0 to the end of the line.
    • This is only temporary (see above for making permanent): If issues occur when disabling SELINUX, reboot, make boot selection (do NOT press enter), press e, edit grub file, look for line near end that usually starts of with "linux..." and ends with a UTF setting, add selinux=0 to the end of the line. (Thanks to: https://www.virtualramblings.com/failed-to-load-selinux-policy-freezing/)
  • Show useful information when booting (it is Linux afterall): edit line in /boot/efi/EFI/centos/grub.cfg that usually starts of with "linux..." and ends with a UTF setting, remove rhel and quiet switches.
  • Boot to a command prompt: systemctl set-default multi-user.target (Thanks to: https://www.itzgeek.com/how-tos/linux/centos-how-tos/change-default-runlevel-in-centos-7-rhel-7.html#axzz3PuGwJi3X)
    • startx will activate GUI
  • Disable firewall (if behind a hardware firewall, etc.): systemctl stop firewalld.service, systemctl disable firewalld.service
  • Install Webmin RPM via Yum (it will also install dependencies automatically)