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Install Centos 6 using PXE

You will need a PXE environment setup as shown at Centos 6 PXE Server/

We will be doing the install over http

  • Install httpd
[root@management tmp]# yum install httpd
  • Start Apache and set it to start on boot
[root@management tmp]# /etc/init.d/httpd start
[root@management tmp]# chkconfig httpd on
  • For this I am just using a default install of Apache. The install files will be available from http://serverip/centos/6/ We need to create the directories to put the install files
[root@management tmp]# mkdir /var/www/html/centos
[root@management tmp]# mkdir /var/www/html/centos/6/
  • Now mount the Centos ISO so you can get the install files off it
[root@management tmp]# mkdir /mnt/centos
[root@management tmp]# mount -o loop /tmp/CentOS-6.0-x86_64-bin-DVD1.iso /mnt/centos/
  • Now copy the install files and then umount the iso
[root@management tmp]# cp -r /mnt/centos/* /var/www/html/centos/6/
[root@management tmp]# umount /mnt/centos/
  • Now create a directory in your tftp directory then copy vmlinuz and initrd.img to it
[root@management tmp]# mkdir /tftpboot/centos
[root@management tmp]# cp /var/www/html/centos/6/isolinux/vmlinuz /tftpboot/centos/
[root@management tmp]# cp /var/www/html/centos/6/isolinux/initrd.img /tftpboot/centos/
  • Now edit the pxelinux.cfg menu to add Centos to it.
[root@management tmp]# vim /tftpboot/pxelinux.cfg/default
  • Set the contents of the file to below. Update the kernel location and initrd location to reflect where you put your vmlinuz and initrd.img
default menu.c32
prompt 0
timeout 300


LABEL Centos
        MENU LABEL Centos
        kernel centos/vmlinuz
        append noapic initrd=centos/initrd.img root=/dev/ram0 init=/linuxrc ramdisk_size=100000
  • Now start a server that you want to install on. Boot from PXE, you will be prompted by a black screen with a blue box in the middle with Centos in it. Hit enter to start the install process
  • The start of the install process is similar to a normal install. Select your country language and keyboard.
  • When you get to the Installation Method screen select URL
  • If you need to make changes to your network do it on the Network Setup screen. In most cases you can leave this as it is
  • Enter the url to your install files on the next screen. In this case URL setup enter
  • Setup will then copy some files and start the install as if it was running from a CD/DVD, continue the rest of the install as normal.