Cloud howto: running batch jobs with HTCondor/Cloud Scheduler

• Obtain images - three methods:
  1. Use cloud provided default images (installed as public images by sysadmins) - easiest method.
  2. Download an existing image (see OpenStack image guide, section 2):
     • Select and image and copy its' URL
     • Use the horizon "Create Image" dialog and copied URL to upload the required image to your cloud account.
  3. Create image with virt-install (and cobbler):
     1. Hardware confguration
     2. On hypervisor node,
        • create and run /root/qemu/mk-cc-demo. This will create a virtual machine with a vnc console that will fail to boot. At this point, the vnc console can be closed.
        • Issue "virsh edit cc-demo" and copy the "MAC" address.
        • Modify /root/qemu/mk-cc-demo to include the copied MAC address.
        • "virsh destroy cc-demo"
        • "virsh undefine cc-demo"
     3. On cobbler server:
        • Create a public/private ssh key: ssh-keygen -f /root/.ssh/id_rsa_cc-demo
        • Create a /var/lib/cobbler/kickstarts/cc-demo.cfg suitable to your application needs. You can create an encrypted root password following [[][these instructions]].
          • Copy your new public key to the end of your kickstart file.
        • Create /root/cobbler/add-cc-demo specifying the kickstart file and the copied MAC address. Run the shell script and then "cobbler sync"
     4. On the hupervisor node:
        • Re-run the "mk-cc-demo" shell script. This will recreate the VM with a vnc console, but this time it will boot/install.
        • After the reboot, log in and make any required customizations (see, OpenStack image guide, section 5).
        • Remove any UDEV network rules that exist (ie. "rm -f /etc/udev/rules.d/70-persistent-net.rules), the hardware address from the network interface, and halt the VM.
        • Convert the image to qcow2 format: "qemu-img convert -O qcow2 cc-demo.img cc-demo.qcow2".
        • Use the horizon "Create Image" dialog to upload the image to your cloud account.

• Customizing images:
  • Interractive instantiation:
  • login as root and modify image
  • Snapshot

• Running batch jobs:
  • Prepare executable
  • Prepare JDL
  • Prepare data souces and repositories
  • Submit jobs
  • Monitoring jobs
  • Retrieving job output