---++ 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: yum 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: =yum 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. * Disable SELinux by setting =SELINUX=disabled= in /etc/sysconfig/selinux (a reboot is needed to fully disable SELinux) * Disable the firewall (when in a secure network), by running: =systemctl disable firewalld= * Enable irqbalance: =systemctl enable irqbalance.service= (only useful system with more than 1 CPU cores) * 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 chronyd= * Reboot the system to activate all changes -- %USERSIG{IvoVanGeel - 07 Jan 2020}%
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