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====== Debian or Ubuntu ====== ===== Preparing an existing installation for AoE ===== You can either work with an installation on - a physical disk on a client machine or - a ''chroot(8)'' environment operating on a loopback-mounted disk image Install the ''aoetools'' package. For Ubuntu, you need to put the ''universe'' part of the distribution into ''/etc/apt/sources.list'', for example: deb http://archive.ubuntu.com/ubuntu feisty main universe Install a kernel image that includes the ''aoe'' driver, i.e. the stock ''linux-image-2.6.18-*'' images included with Debian 4.0 and the ''linux-image-2.6.20-*'' images included with Ubuntu "Feisty Fawn". Create two scripts shown below. These scripts have to be executable. * ''/etc/initramfs-tools/hooks/aoetools'' will copy the ''aoe'' kernel module and ''/sbin/aoe-discover'' to the initial ramdisk. * ''/etc/initramfs-tools/scripts/local-top/aoetools'' is copied to the ram disk and run at boot-time, just before the root filesystem is mounted. If the root device string looks like an AoE target, it brings up all recognized Ethernet interfaces and activates the AoE driver. After you have made sure that ''/etc/initramfs-tools/initramfs.conf'' contains the line BUSYBOX=y you can update the initial ramdisk: # update-initramfs -u -k all Update your ''/etc/fstab'' (or create a new one) as shown in the example below. The Linux AoE driver puts all device files into ''/etc/etherd/''. Entire virtual disks are assigned names ''eX.Y'' where **(X Y)** is a unique AoE shelf:slot number within the local network. Individual partitions on those disks are assigned names ''eX.YpZ'' <code> # file system mount point type options dump pass /dev/etherd/e0.0p1 / ext3 defaults 0 1 /dev/etherd/e0.0p2 none swap sw 0 0 proc /proc proc defaults 0 0 </code> Update ''/boot/grub/menu.lst'' (or create a new one) so that the root device is passed to the kernel (in this example via the parameter ''root=/dev/etherd/e0.0p1''). If the modifications were applied to a physical disk on the client machine, you can now [[sanboot:transfer|transfer the contents of your physical disk to the SAN target]]. If the image you wish to export to client systems was modified directly,, you can now [[sanboot:aoe|make the contents of that image available via AoE]]. FIXME Test booting from chroot-generated image ==== Hint ==== * If the system hangs before the root device has been mounted, passing ''break=mount'' on the command line will spawn a shell before ''scripts/local-top/aoetools'' is run. This should allow for further debugging. ==== Scripts ==== === /etc/initramfs-tools/hooks/aoetools === <code bash> #!/bin/sh set -e PREREQ="" prereqs() { echo "$PREREQ" } case $1 in prereqs) prereqs exit 0 ;; esac . /usr/share/initramfs-tools/hook-functions [ -x /sbin/aoe-discover ] && copy_exec /sbin/aoe-discover /sbin manual_add_modules aoe </code> === /etc/initramfs-tools/scripts/local-top/aoetools === <code bash> #!/bin/sh set -e PREREQ="udev" prereqs() { echo "$PREREQ" } case $1 in prereqs) prereqs exit 0 ;; esac case $ROOT in /dev/etherd/e*) # INTERFACES=`awk -F: '/eth[0-9]*:/ { print $1 }' < /proc/net/dev` INTERFACES=`sed -ne '/eth.*:/{s/:.*$//;p;}' < /proc/net/dev` for i in $INTERFACES; do echo Bringing up interface $i for AoE ifconfig $i up done sleep 5 modprobe aoe aoe-discover ;; esac </code> ===== Preparing an existing installation for iSCSI ===== TBD
