Creating your own CentOS 6.2 x86_64 EBS AMI on Amazon with pv-grub kernel.

Creating your own CentOS 6.2 x86_64 EBS AMI on Amazon with pv-grub kernel.

This article assumes you have a running CentOS 6.2 system with ec2-ami-tools installed and setup.

1. Create an EBS volume in AWS and attach it to the S3 instance

2. Create a partition on the volume:
fdisk /dev/xvd{DRIVE_LETTER}

3. Create filesystem on the volume:
mkfs.ext4 /dev/xvd{DRIVE_LETTER}1

4. Create mount point and mount volume:
mkdir /mnt/ebs ; mount /dev/xvd{DRIVE_LETTER}1 /mnt/ebs

5. Rsync all the files from the S3 instance: (exclude commands are double dashes)
rsync -avH –exclude /dev –exclude /mnt –exclude /sys –exclude /proc /* /mnt/ebs/

6. Create system folders and devices:
mkdir /mnt/ebs/proc
mkdir /mnt/ebs/dev
mkdir /mnt/ebs/sys
MAKEDEV -d /mnt/ebs/dev -x zero
MAKEDEV -d /mnt/ebs/dev -x console
MAKEDEV -d /mnt/ebs/dev -x urandom
MAKEDEV -d /mnt/ebs/dev -x null

7. Change Grub to point to the first partition (hd0,0)
vi /mnt/ebs/boot/grub/grub.conf
default=0
timeout=3
title EC2
root (hd0,0)
kernel /boot/vmlinuz-2.6.32.x86_64 ro root=/dev/xvde1
initrd /boot/initramfs-2.6.32.x86_64.img

8. Unmount and disconnect volume from S3 instance
umount /mnt/ebs

9. Create snapshot of volume

10. Register snapshot as an AMI:
ec2-register –kernel aki-b4aa75dd -b “/dev/sda=”$snap”::true” –root-device-name “/dev/sda” -n “CentOS 6.2 Image” -a x86_64

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