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How to Remote Install CentOS 6 via VNC
For many reasons sometimes it is necessary to reinstall a linux on a server that is hosted in a remote location such as a Data center. You might want to install a new version of the Distribution, change the distribution, or you might need to re-partition you hard drive to be able to use LVM for example. You have three options here:
1 - Go physically to the Datacenter
2 - Pay a datacenter guy to reinstall that for you… :(
3 - Install it Remotely using VNC
I chose the 3rd one since it seems to be the most convenient one. :-) What do we need?
Network configuration of out server: IP Address, Gateway and DNS
If you have all those 3 informations you are good to go!

1 - Download bootstrap files (Kernel and ramdisk image).
# cd /boot
# mkdir centos6
# cd centos6
# wget http://mirror.centos.org/centos/6/os/x86_64/isolinux/vmlinuz
# wget http://mirror.centos.org/centos/6/os/x86_64/isolinux/initrd.img
Add an entry to the Grub Loader
# vi /boot/grub/menu.lst
## Add the following lines to the end of the file and count how many lines starts with tittle: title CentOS 6 VNC Installation root (hd0,0) kernel /centos6/vmlinuz vnc vncpassword=houseoflinux headless ip=10.0.0.10 netmask=255.255.255.0 gateway=10.0.0.1 dns=10.0.0.5 ksdevice=eth0 method=http://mirror.centos.org/centos/6/os/x86_64/ lang=en_US keymap=us initrd /centos6/initrd.img

In my case with I had total 3 entries because I am updating a CentOS 5.6 to CentOS 6 and I had a couple update.
If we have 3 title entries there, the 3rd one should be our CentOS 6 installation but Grub starts counting the first one as 0, so our Centos 6 installation is actually 2 for grub. Here is my menu.lst file:
# grub.conf generated by anaconda
#
# Note that you do not have to rerun grub after making changes to this file
# NOTICE: You have a /boot partition. This means that
# all kernel and initrd paths are relative to /boot/, eg.
# root (hd0,0)
# kernel /vmlinuz-version ro root=/dev/VolGroup00/root
# initrd /initrd-version.img
#boot=/dev/sda
default=0 timeout=5 splashimage=(hd0,0)/grub/splash.xpm.gz hiddenmenu title CentOS (2.6.18-238.19.1.el5) root (hd0,0) kernel /vmlinuz-2.6.18-238.19.1.el5 ro root=/dev/VolGroup00/root initrd /initrd-2.6.18-238.19.1.el5.img title CentOS (2.6.18-194.el5) root (hd0,0) kernel /vmlinuz-2.6.18-194.el5 ro root=/dev/VolGroup00/root initrd /initrd-2.6.18-194.el5.img title CentOS 6 VNC Installation root (hd0,0) kernel /centos6/vmlinuz vnc vncpassword=houseoflinux headless ip=10.0.0.10 netmask=255.255.255.0 gateway=10.0.0.1 dns=10.0.0.5 ksdevice=eth0 method=http://mirror.centos.org/centos/6/os/x86_64/ lang=en_US keymap=us initrd /centos6/initrd.img

Now we set our Grub to boot through our VNC installation only once so In case something goes wrong we can just call the hosting company and ask for a reboot and our server will boot through the default kernel.
# grub grub> savedefault --default=2 --once savedefault --default=2 --once grub> quit
Now we are ready to reboot our machine and start the installation:
# reboot wait… wait… depending on the hardware you have this might a while….

You can now use your preferred VNC client and start the installation process

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