Tuesday, February 7, 2012

Fedora 16 on OpenStack

After following Brian's guide on installing Fedora 15 on OpenStack, I thought I would try my hand at Fedora 16.  There where a few differences.

Filesystem Differences
Brian's guide installed Fedora using LVM.  I installed Fedora without LVM (there's a little checkbox on the partition page of Anaconda).  Without LVM, I can skip the steps on listing the physical volumes and logical volumes to find the start and end of the partition.

Also, Fedora 16 uses gpt partition.  fdisk command cannot read the partition table, therefore I had to install gdisk (in epel).  Running it has very similar command and output:

$ /usr/sbin/gdisk -l /tmp/fedora16
GPT fdisk (gdisk) version 0.8.1

Partition table scan:
  MBR: protective
  BSD: not present
  APM: not present
  GPT: present

Found valid GPT with protective MBR; using GPT.
Disk /tmp/fedora16: 20971520 sectors, 10.0 GiB
Logical sector size: 512 bytes
Disk identifier (GUID): A351197B-8233-4811-9B28-69A1DE121AD2
Partition table holds up to 128 entries
First usable sector is 34, last usable sector is 20971486
Partitions will be aligned on 2048-sector boundaries
Total free space is 4029 sectors (2.0 MiB)

Number  Start (sector)    End (sector)  Size       Code  Name
   1            2048            4095   1024.0 KiB  EF02  
   2            4096         1028095   500.0 MiB   EF00  ext4
   3         1028096        16777215   7.5 GiB     0700  
   4        16777216        20969471   2.0 GiB     8200  

Then, to extract the image:
dd if=/tmp/fedora16 of=/tmp/server-extract.img skip=1028096 count=$((16777215-1028096)) bs=512

SSH Key Differences
Brian's guide instructed you to create a /etc/rc.local.  Fedora 16 sees the introduction of systemd, which no longer executes rc.local.  Instead, it looks for the file /etc/rc.d/rc.local (possibly a symlink to /etc/rc.local?).  This file needs to be executable and be sure to include the shebang.

Also, Fedora 16's selinux doesn't label the root file system correctly (BUG), and simply making the .ssh directory doesn't not allow sshd to read it.  To solve selinux problem, I disabled selinux (bad, bad me).

Common Commands
After installing Fedora 16 into an image, and extracting the kernel and ramdisk, there where a few commands that where executed over and over as I debugged the image:

Make the changes to the image:
sudo /usr/libexec/qemu-kvm -m 2048 -drive file=/tmp/fedora16 -net nic -net user -vnc -cpu qemu64 -M rhel5.6.0 -smp 2 -daemonize

Extract the partition:
dd if=/tmp/fedora16 of=/tmp/server-extract.img skip=1028096 count=$((16777215-1028096)) bs=512

Start the VM to change the label on the image:
sudo /usr/libexec/qemu-kvm -m 2048 -drive file=/tmp/fedora16 -net nic -net user -vnc -cpu qemu64 -M rhel5.6.0 -smp 2 -daemonize -drive file=/tmp/server-extract.img 

Rename the image to something appropriate:
mv /tmp/server-extract.img /tmp/fedora16-extracted.img

Bundle the image for OpenStack:
euca-bundle-image --kernel aki-0000002e --ramdisk ari-0000002f -i /tmp/fedora16-extracted.img -r x86_64

Upload the image to OpenStack:
euca-upload-bundle -b derek-bucket -m /tmp/fedora16-extracted.img.manifest.xm

Register the image (this command completes fast, but openstack takes for ever to decrypt and untar the image):
euca-register derek-bucket/fedora16-extracted.img.manifest.xml

Now to build OSG packages for Fedora...  maybe not.

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