murano-deployment/cirros

CirrOS Notes

Launching CirrOS in KVM

• Install KVM on your host

># apt-get install kvm libvirt-bin

• Download CirrOS image from launchpad

># wget https://launchpad.net/cirros/trunk/0.3.0/+download/cirros-0.3.0-x86_64-disk.img -O cirros.qcow2

• Add 169.254.169.254 to virbr0

># ip addr add 169.254.169.254/32 dev virbr0

• Start CirrOS

># kvm -m 512 -drive file=cirros.qcow2 -net nic,model=virtio -net tap,ifname=tap0 -nographic

• To poweroff the system and return to your console type

>$ sudo poweroff

Modifying the image

http://alexeytorkhov.blogspot.ru/2009/09/mounting-raw-and-qcow2-vm-disk-images.html

• Get additional files to support muptipart userdata:

>$ cd ~
>$ git clone https://github.com/stackforge/murano-deployment.git

• Convert Cirros image into RAW format (skip arch which you don't need):

># mkdir /tmp/cirros
># cd /tmp/cirros
>$ wget https://launchpad.net/cirros/trunk/0.3.0/+download/cirros-0.3.0-i386-disk.img
>$ wget https://launchpad.net/cirros/trunk/0.3.0/+download/cirros-0.3.0-x86_64-disk.img

• Download murano-agent (skip arch which you don't need):

># cd /tmp/cirros
># wget https://www.dropbox.com/sh/zthldcxnp6r4flm/Os1Q9W5ZIx/murano-agent-i386
># wget https://www.dropbox.com/sh/zthldcxnp6r4flm/7dsz0mMg1_/murano-agent-x86_64

• Convert Cirros image into RAW format:

># cd /tmp/cirros
>$ qemu-img convert -O raw cirros-0.3.0-<ARCH>-disk.img cirros-raw.img

• Mount the RAW image:

># mkdir /mnt/image
># losetup /dev/loop0 cirros-raw.img
># kpartx -a /dev/loop0
># mount /dev/mapper/loop0p1 /mnt/image
># cd /mnt/image

• Copy new files and apply patch:

># cp ~/murano-deployment/cirros/config.local.sh /mnt/image/var/lib/cloud
># patch -d /mnt/image/etc/init.d < ~/murano-deployment/cirros/cloud-userdata.patch

• Copy murano-agent

># cp /tmp/cirros/murano-agent-<ARCH> /mnt/image/usr/sbin/murano-agent
># chmod 755 /mnt/image/usr/sbin/murano-agent
># chown root:root /mnt/image/usr/sbin/murano-agent

• Copy init script

># cp /tmp/cirros/murano-agent.init /mnt/image/etc/init.d/murano-agent
># chmod 755 /mnt/image/etc/init.d/murano-agent
># chown root:root /mnt/image/etc/init.d/murano-agent

• Create symlink

># cd /mnt/image/etc/rc3.d
># ln -s ../init.d/murano-agent S99-murano-agent

• Do everything else you need.

WARNING

Be careful creating links - use only relative paths for link targets!

• Unmount the image and convert it back to QCOW:

># cd /tmp/cirros
># umount /mnt/image
># kpartx -d /dev/loop0
># losetup -d /dev/loop0
># qemu-img convert -O qcow2 cirros-raw.img murano-cirros.qcow2