(r7) InstallingCentOS6 < Main

---++ Installing !CentOS 6

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: ftp://ftp.tudelft.nl/pub/Linux/centos.org/6/isos/x86_64/CentOS-6.5-x86_64-netinstall.iso. Check the !MD5 sum by running md5sum on !CentOS-6.5-x86_64-netinstall.iso and compare the result to the !MD5 sums at: ftp://ftp.tudelft.nl/pub/Linux/centos.org/6/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.

Skip the disk checking after booting the install !CD. Set the installation language to English. Select !URL for the Installation Method and enter the following !URL: ftp://ftp.tudelft.nl/pub/Linux/centos.org/6/os/x86_64/, after configuring the network. Use auto configuration, if possible. 

   * 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 provided boot loader configuration.
   * Select the Minimal installation option.
   * Wait for the installation to finish.
   * Reboot the system.

   * Add the !EPEL repository by running: rpm -Uvh  http://dl.fedoraproject.org/pub/epel/6/x86_64/epel-release-6-8.noarch.rpm
   * Add the noatime option to all ext3/ext4 filesystem options in /etc/fstab
   * Edit /boot/grub/menu.lst and remove the rhgb and quiet options
   * Edit /etc/rc.local and add the following line: =/usr/bin/setterm -blank 0= This will prevent the screen from going black, which may be helpful in case of a kernel problem.
   * 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 disable SELinux)
   * Disable the firewall (when in a secure network), by running: =chkconfig iptables off; chkconfig ip6tables off=
   * Add the following line to /etc/sysconfig/network:
      * =NOZEROCONF=yes=
   * Install the following packages:
<verbatim>
yum install irqbalance sysstat iotop strace tcpdump lsof ntp man man-pages man-pages-overrides mlocate wget openssh-clients perl iptraf-ng bind-utils
</verbatim>
   * Enable irqbalance: =chkconfig irqbalance on= (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/sysconfig/ntpdate:
<verbatim>
OPTIONS="-U ntp -s -b 0.nl.pool.ntp.org 1.nl.pool.ntp.org"
</verbatim>
   * Enable ntpdate and ntpd: =chkconfig ntpdate on; chkconfig ntpd on=
   * Reboot the system to activate all changes

-- Main.IvoVanGeel - 17 Oct 2012
Topic revision: r7 - 12 Feb 2014 - IvoVanGeel
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