InstallingCentOS7 < Main

---++ Installing !CentOS 7

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 network install CD, which can be found at: http://ftp.tudelft.nl/centos.org/7/isos/x86_64/CentOS-7-x86_64-NetInstall-1503.iso. Check the !MD5 sum by running md5sum on !CentOS-7-x86_64-NetInstall-1503.iso and compare the result to the !MD5 sums at: http://ftp.tudelft.nl/centos.org/7/isos/x86_64/md5sum.txt.

Boot from the network install !CD. Make sure you have at least 768MB of memory available, or you will not be able to create a custom harddisk layout.

Select Install !CentOS 7 at the !CD boot screen. Set the installation language to English; Keyboard: English (United States). Set the Date&Time options. Click the Installation Source setting, select Network and enter the correct !URL: http://ftp.tudelft.nl/centos.org/7/os/x86_64/

<hr>

   * Select the U.S. English keyboard layout.
   * Select Basic Storate Devices (unless you are installing to a !SAN).
   * Enter the hostname you would like to use (do not add the domain name).
   * Select the correct timezone and make sure System uses !UTC is enabled.
   * Enter the root password.
   * Select Create Custom Layout and create a primary partition for the !OS and one for swap (create a swap partition as large as the amount of memory you have).
   * Use the ext4 filesystem for all partitions (instead of XFS)
   * Use the provided boot loader configuration.
   * Select the Minimal installation option.
   * Wait for the installation to finish.
   * Reboot the system.

   * Add the !EPEL repository by running: yum install epel-release
   * Install the following packages:
<verbatim>
yum install -y sysstat iotop strace tcpdump lsof ntp ntpdate man man-pages mlocate wget perl iptraf-ng bind-utils net-tools psmisc vim-enhanced rsync
</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* (add *elevator=deadline* when running on an SSD)
   * Create a new grub2 config file using: =grub2-mkconfig > /boot/grub2/grub.cfg=
   * Update the system: =yum upgrade=
   * Add a normal user, to log in as: useradd -m username
   * Set a password: passwd username
   * Edit the sudoers file by running: visudo
      * Comment out the line: =Defaults    requiretty=
      * Comment out the line: =Defaults   !visiblepw=
      * Enable users in the group wheel to use sudo, by uncommenting: =%wheel  ALL=(ALL)       ALL=
   * Add the normal user to the wheel group: =usermod -a -G wheel username=
   * Make sure root cannot log in via ssh by changing /etc/ssh/sshd_config:
      * =PermitRootLogin without-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 on an SMP system)
   * Set up /etc/ntp.conf:
<verbatim>
driftfile /var/lib/ntp/drift
restrict default kod nomodify notrap nopeer noquery
restrict -6 default kod nomodify notrap nopeer noquery
restrict 127.0.0.1 
restrict -6 ::1
server 0.nl.pool.ntp.org
server 1.nl.pool.ntp.org
server 2.nl.pool.ntp.org
server 3.nl.pool.ntp.org
</verbatim>
   * Change /etc/ntp/step-tickers:
<verbatim>
0.nl.pool.ntp.org
1.nl.pool.ntp.org
</verbatim>
   * Enable ntpdate and ntpd: =systemctl enable ntpdate ; systemctl enable ntpd=
   * Reboot the system to activate all changes


-- %USERSIG{IvoVanGeel - 19 Nov 2014}%
This topic: Main > WebHome > InstallingCentOS7
Topic revision: r19 - 18 Mar 2019 - IvoVanGeel