InstallingCentOS8 < Main

---++ Installing !CentOS 8

Please note: This instruction was created for my personal use. Feel free to follow it, but I am not responsible for any problems or data loss!

Download the boot install CD, which can be found at: http://ftp.tudelft.nl/centos.org/8/isos/x86_64/CentOS-8-x86_64-1905-boot.iso.
Check the !SHA256 sum by running sha256sum on !CentOS-8-x86_64-1905-boot.iso and compare the result to the !SHA256 sums at: http://ftp.tudelft.nl/centos.org/8/isos/x86_64/CHECKSUM.

Boot from the install !CD. Make sure you have at least 1024MB of memory available, or you will not be able to create a custom harddisk layout.

Select Install !CentOS Linux 8.0.1905 at the !CD boot screen. Set the installation language to English; Keyboard: English (United States).

<hr>

   * Under !SYSTEM:
      * Click Installation Destination
      * Make sure only 1 disk is selected
      * Set Storage Configuration to: Custom
      * Enable Encrypt my data, if desired
      * Click Done
      * Use the following partitioning scheme: Standard Partition
      * Click on: Click here to create them automatically
      * Change all non-swap partitions to use Ext4 instead of XFS
      * Click Done
      * Click Accept Changes (note: this will destroy all data on this disk)
      * Disable !KDUMP
      * Click Network & Host Name
      * Fill in the desired host name
      * Configure each network interface (Enable automatically connect to this network, set Link Negotioation to Automatic, set IPv6 method to: Ignore, when not using IPv6)
      * Click Done
   * Under !LOCALIZATION:
      * Leave keyboard set to English (US)
      * Leave Language Support set to: English (United States)
      * Click Time & Date
      * Select the correct Region and City
      * Make sure Network Time is enabled (Change the settings, when needed)
      * Click Done
   * Under !SOFTWARE:
      * Click the Installation Source setting, select !http:// and set the !URL to: http://ftp.tudelft.nl/centos.org/8/BaseOS/x86_64/os/
      * Go to Software Selection and select Minimal Install
   * Click on Begin Installation
   * Set the Root password
   * Create a user for yourself and enable: Make this user administrator
   * Wait for the installation to finish
   * Reboot the system

   * Add the !EPEL repository by running: dnf install epel-release
   * Install the following packages:
<verbatim>
dnf install -y sysstat iotop strace tcpdump lsof man man-pages mlocate wget perl iptraf-ng bind-utils net-tools psmisc vim-enhanced rsync chrony atop
</verbatim>
   * Add the noatime option to all ext3/ext4/XFS/etc filesystem options in /etc/fstab
   * Edit /etc/default/grub and remove the *rhgb* and *quiet* options from GRUB_CMDLINE_LINUX. Replace these options with: *nomodeset vga=normal consoleblank=0* (add *elevator=deadline* when running on an SSD or in a VM)
   * Create a new grub2 config file using: =grub2-mkconfig > /boot/grub2/grub.cfg=
   * Update the system: =dnf upgrade=
   * Make sure root cannot log in via ssh by changing /etc/ssh/sshd_config:
      * =PermitRootLogin prohibit-password=
      * This will disable logging in as root, via ssh, but it is still possible to log in as root using SSH public key authentication.
   * Optional: Set SELinux to permissive mode by setting =SELINUX=permissive= in /etc/sysconfig/selinux (run =setenforce 0= to do this right away)
   * Disable the firewall (only when in a secure network!), by running: =systemctl disable --now firewalld=
   * Enable irqbalance: =systemctl enable --now irqbalance.service= (probably already enabled and only useful system with more than 1 CPU core)
   * Edit /etc/chrony.conf and add an NTP server pool:
<verbatim>
pool nl.pool.ntp.org iburst
</verbatim>
   * Or specify a number of NTP servers:
<verbatim>
server 0.nl.pool.ntp.org iburst
server 1.nl.pool.ntp.org iburst
server 2.nl.pool.ntp.org iburst
server 3.nl.pool.ntp.org iburst
</verbatim>
   * Enable the chronyd service: =systemctl enable --now chronyd=

   * Reboot the system to activate all changes

-- %USERSIG{IvoVanGeel - 07 Jan 2020}%
This topic: Main > WebHome > InstallingCentOS8
Topic revision: r4 - 24 Dec 2020 - IvoVanGeel